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NAVI D-25 Instruction Manual

Ph meter
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For more information, please contact us:
ExpotechUSA
10700 Rockley Road
Houston, Texas 77099
USA
281-496-0900 [voice]
281-496-0400 [fax]
E-mail: sales@expotechusa.com
Website: www.ExpotechUSA.com

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Summary of Contents for NAVI D-25

  • Page 1 For more information, please contact us: ExpotechUSA 10700 Rockley Road Houston, Texas 77099 281-496-0900 [voice] 281-496-0400 [fax] E-mail: sales@expotechusa.com Website: www.ExpotechUSA.com...
  • Page 3 Preface Thank you for purchasing one of the D-50 Series pH meters. This meter is designed with a compact body that can be held in one hand and features a water-resistant construction Note 1. It has a large-sized LCD display, which enables to use the varied functions by simple operations, and especially will be convenient to use on-location.
  • Page 4 Precautions for use ■ CE Marking This product is in conformity with the following directives and standards: Directives:The EMC Directives 89/336/EEC The Electrical Product Safety Directive 73/23/EEC Standards: EN61326: 1997+A1:1998 (EMISSION: Class B, IMMUNITY Category: Minimum Require- ment) EN61010-1: 2001 Installation Environment This product is designed for the following environment.
  • Page 5 Precautions for use ■ Type and Definition of Signal Words For the safety use, the meter is equipped with the Warning Labels to alert every operator and user to the possible risk and danger. Before using understanding each message. The meaning of signal words are as follows: This indicates an potentially hazardous situation which, (WARNING) if not avoided, will result in death or serious injury.
  • Page 6 Precautions for use ● Indication WARNING This indicates an potentially hazardous situation which, if not avoided, will result in death or serious injury. CAUTION This indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be used to alert unsafe practices.
  • Page 7 Precautions for use ■ Cautionary Items ● Precautions Do not give physical shock to the meter like dropping or hitting. ● Do not immerse the meter into alcohol, organic solvent, strong ● acid, strong alkaline, and other similar solutions. The meter contains ABS resin, acrylic resin, and various rubber products in its body use a hair-dryer for drying the meter.

  • Page 8: Table Of Contents

    CONTENTS 1 Overview of the Meter ....1.1 Package contents ................1.2 Functions..................1.3 Part names ..................1.4 Explanation of display..............1.5 Operation keys................
  • Page 9 CONTENTS 3.4.9 Ion slope setting (D-53) ..............3.4.10 Conductivity unit setting (D-54 ) ........... 3.4.11 Temperature coefficient setting (D-54 ) ........3.4.12 DO salinity compensation setting (D-55 ) ........3.4.13 DO atmospheric pressure compensation setting (D-55 ) ..... 3.4.14 Maintenance mode ............... 4 RS-232C communications .
  • Page 10 CONTENTS 6.5.2 More troubleshooting ..............166 7 Reference ......173 7.1 pH measurement................174 7.2 mV (oxidation-reduction potential [ORP]) measurement....
  • Page 11 CONTENTS VIII HORIBA...

  • Page 12: Overview Of The Meter

    1 Overview of the Meter 1.1 Package contents Overview of the Meter This chapter explains the part names, how to connect the electrodes, how to replace the batteries, and precautions when using the meter. Package contents The following items are shipped with each HORIBA pH meter package.
  • Page 13 1 Overview of the Meter 1.1 Package contents Soft case 1 pc Protective cap 1 pc (D-53,54,55) Operation manual 1 book To take measurements, you will need electrode(s). Refer to “7.10 Spare and optional parts” page 208 when purchasing the electrode(s). HORIBA...

  • Page 14: Functions

    1 Overview of the Meter 1.2 Functions Functions The D-50 Series features the following functions. ● Measurement items Model Required electrode/ Items standard solution D-52 D-53 D-54 D-55 ○ ○ ○ ○ pH electrode, pH standard solution ORP (mV) ○ ○...
  • Page 15 1 Overview of the Meter 1.2 Functions Model Page Function Explanation D-52 D-53 D-54 D-55 ○ ○ ○ ○ pH calibration Displays the date page history display of calibration, asymmetrical potential and sensitivity. Relative mV Displays mV when ○ ○ ○...
  • Page 16 1 Overview of the Meter 1.2 Functions ● Setting Items Model Page Function Explanation D-52 D-53 D-54 D-55 pH standard Enables standard ○ ○ ○ ○ page solution setting solution used for calibration to be changed to NIST and US specifications settings.
  • Page 17 1 Overview of the Meter 1.2 Functions Model Page Function Explanation D-52 D-53 D-54 D-55 − − ○ − COND unit Toggles between page S/m and S/cm. COND Automatically or − − ○ − page temperature manually sets a coefficient temperature coefficient for a sample.
  • Page 18 1 Overview of the Meter 1.2 Functions ● Functions in Maintenance mode Page Function Explanation LCD check Enables check for whether or not all LCD page segments are displayed. Battery voltage Enables simple check of battery voltage. page check Temperature Adjusts the display of the temperature page display...

  • Page 19: Part Names

    1 Overview of the Meter 1.3 Part names Part names The D-52/53/54/55 pH meters have the following parts: Display Keys Serial communication port AC connector Dry-cell battery holder Temperature connector (CH2)* Temperature connector (CH1) Electrode connector (CH1) Electrode connector (CH2)* * The D-52 has CH1 only.

  • Page 20: Explanation Of Display

    1 Overview of the Meter 1.4 Explanation of display Explanation of display Input channel Error No., Measurement Data No. item Year, Temperature, Status display month and day HOLD Electrode status Second Meter mode Measurement Measurement unit data, hour and Cursor for selecting minute setting modes Calibration...
  • Page 21 1 Overview of the Meter 1.4 Explanation of display Part name Display Contents Data No. Displayed when the data number has been set. Status display Shows error number and data number. Displayed when AUTO data memory is being performed. Displayed when the serial communication is active.
  • Page 22 1 Overview of the Meter 1.4 Explanation of display Part name Display Contents HOLD Displayed while the data is held (HOLD status). Blinks during measurement or calibration. Electrode status (Only in pH Measurement mode) Not displayed: Normal Blinking: Cleaning is needed. Constant display: Replacement time is approaching.

  • Page 23: Operation Keys

    1 Overview of the Meter 1.5 Operation keys Operation keys This section describes the functions of the keys. Name Description MEAS key Returns to the Measurement mode. Starts measurement. MODE key Selects measurement item. SET key Selects setting item. CAL key Enters the Calibration mode.

  • Page 24: Connecting The Electrodes

    1 Overview of the Meter 1.6 Connecting the electrodes Connecting the electrodes Connect the electrodes to the meter using the following procedure: ・ Do not allow any water to come into contact with the connector. ・ Do not touch the connector with uncleaned hands. ・...
  • Page 25 1 Overview of the Meter 1.6 Connecting the electrodes ● Electrode connector (G-R electrode) Ion/Conductivity/DO electrode pH/ORP electrode O-ring Insert the electrode connector, making sure to align the connector grooves with the pins in the connector port on the main unit (see photo, ① ). Do not push the electrode with undue force when the pins are not properly aligned.
  • Page 26 1 Overview of the Meter 1.6 Connecting the electrodes ● Temperature connector Insert the temperature connector into the jack on the main unit until the O-ring on the electrode cannot be seen at all (see photo, ④ ). The meter will not be waterproof if the electrode is not inserted properly.

  • Page 27: Inserting/Replacing The Dry-Cell Batteries

    1 Overview of the Meter 1.7 Inserting/replacing the dry-cell batteries Inserting/replacing the dry-cell batteries The dry-cell batteries are not placed in the meter before shipping. To insert the batteries, follow the procedure below. Note that if “ERR 2” appears on the display while using the meter, it indicates that the charge of the dry-cell bat- teries is running low.
  • Page 28 1 Overview of the Meter 1.7 Inserting/replacing the dry-cell batteries If there are old batteries inside, remove them. Place the new batteries in the meter, verifying the orientation of the poles (“+” and “-”). Check that the rubber packing is not twisted and no foreign matter is stuck to it.

  • Page 29: Connecting The Ac Adapter

    1 Overview of the Meter 1.8 Connecting the AC adapter Connecting the AC adapter When using the meter with an AC power supply, use the designated AC adapter (option). AC adapter specifications Supply voltage range 100 - 200 V AC Frequency range 50/60 Hz Current rating Max 370 mA...

  • Page 30: Using The Protective Cap (D-53/54/55)

    1 Overview of the Meter 1.9 Using the protective cap (D-53/54/55) Using the protective cap (D-53/54/55) For meters having two electrode connector channels, be sure to use the protective cap when using only one channel, in order to protect the unused connector Protective cap D-52/53/54/55...
  • Page 31 1 Overview of the Meter 1.9 Using the protective cap (D-53/54/55) HORIBA...

  • Page 32: Taking Measurements

    2 Taking Measurements 2.1 Turning the meter ON/OFF Taking Measurements This chapter explains how to take basic measurements. Turning the meter ON/OFF Pressing the ON/OFF key turns the power on/off. The ON/OFF key functions when it is pressed continuously for about one second to protect against accidental operation.

  • Page 33: Measurement Modes

    2 Taking Measurements 2.3 Measurement modes Measurement modes The D-50 Series of pH meters have an Instantaneous Value Measurement mode and an Auto Hold Measurement mode for all components of the solution being measured. ● Instantaneous Value Measurement mode The D-50 Series of pH meters perform instantaneous value measurement as the default measurement mode when the power is first turned ON and when the auto hold measurement is cancelled or cleared.
  • Page 34 2 Taking Measurements 2.3 Measurement modes ● Auto Hold Measurement mode Auto Hold Measurement mode maintains the display of the value measured when the meter automatically judges that the measured value has stabilized. Press the MEAS key with the initial screeen displayed to make “HOLD”...

  • Page 35: Selecting The Measurement Modes

    2 Taking Measurements 2.4 Selecting the measurement modes Selecting the measurement modes Pressing the MODE key changes the measurement mode. The last measurement mode item is the clock display. Pressing the MODE key once more returns the display to the first measurement mode. Power ON pH Measurement (CH1) mode (instantaneous value) mV Measurement (CH1) mode (instantaneous value)

  • Page 36: Measuring Ph

    2 Taking Measurements 2.5 Measuring pH Measuring pH The following shows the operational flow for pH measurement. ● Measuring pH: basic operational flow 1. Electrode preparation Power ON 2. pH Measurement mode screen (instantaneous value) “ ● Setting the clock” page 73 3.
  • Page 37 2 Taking Measurements 2.5 Measuring pH ● Electrode preparation Refer to the electrode instruction manual and make sure you have the necessary electrode(s). Plastic-body pH electrode: 9621-10D Glass-body pH electrode: 9611-10D pH (micro) electrode: 9669-10D pH (sleeve) electrode: 9677-10D Chemical solution The liquid inside the electrode is highly concentrated potassium chloride (3.33 mol/L KCl).
  • Page 38 2 Taking Measurements 2.5 Measuring pH ● Standard solution calibration Perform a one-point calibration for making simple pH measurements; for more accurate measurements, perform at least a two-point calibration. Up to three points can be used for calibration. If you perform calibration for a fourth points, “ERR06 Calibration point error”...
  • Page 39 2 Taking Measurements 2.5 Measuring pH Wash the tip of the electrode well with pure (de- ionized) water, and then wipe with filter paper or tissue paper. Open the internal solution filler port. Leave the port open while calibration is taking place.
  • Page 40 2 Taking Measurements 2.5 Measuring pH Press the CAL key to start calibration. The measured value will be displayed, and “HOLD” will blink until the reading stabilizes. When the value stabilizes, “HOLD” will stop blinking and the calibrated value will be displayed. bottle mark will be displayed, indicating that calibration was conducted with pH7 standard solution...
  • Page 41 2 Taking Measurements 2.5 Measuring pH Calibration at second point Wash the electrode well again with pure (de- ionized) water, and then wipe with filter paper or tissue paper. Immerse the tip of the electrode in a beaker containing pH 4 standard solution. Press the CAL key to start calibration.
  • Page 42 2 Taking Measurements 2.5 Measuring pH The example of calibration at second point has explained the calibration process using the order from pH 7 to pH 4. However, the calibration order of the standard solutions can be arbitrarily chosen. Electrode status You can check the status of the electrode after calibration.
  • Page 43 2 Taking Measurements 2.5 Measuring pH ● pH repeatability check The repeatability of the calibration can be checked if the calibration has been performed with pH 7 standard solution of NIST or US. The repeatability check is operable only once after calibration.
  • Page 44 2 Taking Measurements 2.5 Measuring pH ● Measuring pH Wash the tip of electrode well with pure (de- ionized) water, and then wipe with filter paper or tissue paper. Open the internal solution filler port. Leave the port open while measurement is taking place.
  • Page 45 2 Taking Measurements 2.5 Measuring pH Press the MEAS key with the initial screeen displayed. “HOLD” will blink until the reading stabilizes. When the indicated value stabilizes, “HOLD” will stop blinking and will be displayed. The indicated value will remain displayed continually. Refer to the “...

  • Page 46: Measuring Orp

    2 Taking Measurements 2.6 Measuring ORP Measuring ORP The following shows the operational flow for ORP measurement. ● ORP measurement operational flow 1. Electrode preparation Power ON pH Measurement mode (instantaneous value) 2. mV Measurement mode (instantaneous value) “ ● Setting the clock” page 73 “3.4.5 Auto data storage setting”...
  • Page 47 2 Taking Measurements 2.6 Measuring ORP ● Measuring ORP Immerse the electrode all the way in the sample solution. For accurate measurements, be sure to immerse the electrode in the sample at least three centimeters. Press the MODE key, once. The ORP Instantaneous Value Measurement screen will appear.
  • Page 48 2 Taking Measurements 2.6 Measuring ORP If the data is to be saved to the memory, press the ▲ key. See “3.1 Data memory function” page 65. D-52/53/54/55...
  • Page 49 2 Taking Measurements 2.6 Measuring ORP ● Measuring relative mV This meter can measure relative potential difference by shifting the measured potential to zero. (A potential without compensation is called absolute mV.) Press the CAL key in the mV Instantaneous Value Measurement mode.

  • Page 50: Ion Measurement (D-53)

    2 Taking Measurements 2.7 Ion measurement (D-53) Ion measurement (D-53) The following shows the operational flow for ION measurement. ● Ion measurement operational flow 1. Electrode preparation Power ON pH Measurement mode (instantaneous value) mV Measurement mode 2. ION (ISE) Measurement mode “...
  • Page 51 2 Taking Measurements 2.7 Ion measurement (D-53) ● Electrode preparation Refer to the electrode instruction manual and make sure you have the correct electrode. Chemical solution Toxic substances may be used in some ION electrodes. Use caution when handling them. If the internal solution in the electrode comes in contact with your hands or skin, wash immediately with Caution...
  • Page 52 2 Taking Measurements 2.7 Ion measurement (D-53) ● Standard solution calibration Calibrate the pH meter using a standard solution with a known concentration. Selecting the ions to be measured The ION to be measured is set using the load count (charge quantity).
  • Page 53 2 Taking Measurements 2.7 Ion measurement (D-53) Refer to the electrode instruction manual for how to adjust the standard solution. Mix the standard solution at a constant speed (300 – 500 rpm), using a magnetic stirrer. Measure the standard solution and the sample that is to be measured while they are at as close to the same temperature as possible.
  • Page 54 2 Taking Measurements 2.7 Ion measurement (D-53) While “HOLD” is blinking To cancel calibration: Clear the hold by pressing the CAL key, again. To fix the calibration value: Fix the value using the ENTER key. Calibrations using two or three points To conduct calibration using two or three points, clear the “HOLD”...
  • Page 55 2 Taking Measurements 2.7 Ion measurement (D-53) To clear calibrated values, refer to “ ● Clearing calibrated values” page 32. HORIBA...
  • Page 56 2 Taking Measurements 2.7 Ion measurement (D-53) ● Ion measurement Wash the tip of electrode well with pure (de- ionized) water, and then wipe with filter paper or tissue paper. Do not touch or scratch the responsive membrane on the ION electrode. Immerse the electrode in the sample to a sufficient depth (at least 3 cm).
  • Page 57 2 Taking Measurements 2.7 Ion measurement (D-53) When the meter is in the Instantaneous Value Measurement mode or the measurement value is on HOLD in the Auto Hold Measurement mode, you can store the measurement data by pressing the ▲ key. See “3.1 Data memory function”...
  • Page 58 2 Taking Measurements 2.7 Ion measurement (D-53) Additives and pH range ION electrode Additives (per liter) pH range Potassium 5.9 g/L sodium chloride pH 5 – 11 (NaCl) (Ideal is near neutral) Calcium 7.5 g/L potassium pH 5 – 11 chloride (KCl) (Ideal is near neutral) Chloride...
  • Page 59 2 Taking Measurements 2.7 Ion measurement (D-53) Effects of interfering ions Compatible tolerance limits electrode Potassium , Ma , Mg , Ca , Sr , Ba = 1,000; = 70; Cs = 3; Rb = 0.4 (at 10 mol/L K Calcium , Ba , NH...

  • Page 60: Conductivity Measurement (D-54)

    2 Taking Measurements 2.8 Conductivity measurement (D-54) Conductivity measurement (D-54) The following shows the operational flow for conductivity measurement. ● Measuring conductivity: basic operational flow 1. Electrode preparation Power ON pH Measurement mode (instantaneous value) mV Measurement mode 2. Conductivity Measurement mode (instantaneous value) “...
  • Page 61 2 Taking Measurements 2.8 Conductivity measurement (D-54) ● Electrode preparation Refer to the electrode instruction manual and make sure you have the correct electrode. ● Entering the Conductivity Measurement mode Remove the electrode protective cap from the electrode. Immerse the electrode in pure (de-ionized) water.
  • Page 62 2 Taking Measurements 2.8 Conductivity measurement (D-54) ● CELL SET mode (Setting cell constant) Set the cell constant the first time an electrode is connected to the main unit of the meter. To enter the CELL SET mode, press the CAL key while in the Measurement mode.
  • Page 63 2 Taking Measurements 2.8 Conductivity measurement (D-54) ● Calibrating the cell constant The cell constant of the electrode changes as the elec- trode is used. Calibrate the cell constant once a year or Calibrating the cell constant will update it to match the condition of the current electrode.
  • Page 64 2 Taking Measurements 2.8 Conductivity measurement (D-54) Start the calibration by pressing the CAL key. HOLD is displayed and the calibration is completed. To redo the calibration, press the CAL key once more. Press the MEAS key to enter the Measurement mode.
  • Page 65 2 Taking Measurements 2.8 Conductivity measurement (D-54) ● Measuring conductivity Immerse the electrode in the sample. Conductivity is greatly affected by temperature. To measure with increased accuracy, use a temperature bath to keep the solutions at a constant temperature. Press the MEAS key with the initial screeen displayed.

  • Page 66: Dissolved Oxygen (Do) Measurement (D-55)

    2 Taking Measurements 2.9 Dissolved oxygen (DO) measurement (D-55) Dissolved oxygen (DO) measurement (D-55) The following shows the operational flow for dissolved oxygen (DO) measurement. ● Measuring dissolved oxygen: basic operational flow 1. Electrode preparation Power ON pH Measurement mode (instantaneous value) mV Measurement mode 2.
  • Page 67 2 Taking Measurements 2.9 Dissolved oxygen (DO) measurement (D-55) ● Electrode preparation Refer to the electrode instruction manual and make sure you have the correct electrode. Chemical solution Highly concentrated potassium hydroxide (KOH) is used in the internal solution of the electrode. If the internal solution in the electrode comes in contact with your hands or skin, wash Caution...
  • Page 68 2 Taking Measurements 2.9 Dissolved oxygen (DO) measurement (D-55) ● Air calibration To achieve correct measurements, the pH meter must be calibrated prior to taking measurements with it. The D-50 Series pH meter can be calibrated using a simple one-point air calibration and, when highly precise measurement is required, using a two-point standard solution calibration.
  • Page 69 2 Taking Measurements 2.9 Dissolved oxygen (DO) measurement (D-55) Press the CAL key one more time to start calibration. The measured value will be displayed, and “HOLD” will blink until the reading stabilizes. When the measured value stabilizes, “HOLD” will stop blinking and the “End”...
  • Page 70 2 Taking Measurements 2.9 Dissolved oxygen (DO) measurement (D-55) Calibrate using purified air. (Errors may occur and considerable time may be required before the reading stabilizes, if calibration is conducted where there is severe fluctuation in temperature, where there is wind or rain, or close to a heater.) Do not hold the sensor holder or electrode body with your hand, during or soon before/after calibration.
  • Page 71 2 Taking Measurements 2.9 Dissolved oxygen (DO) measurement (D-55) ● Measuring DO Salinity concentration correction is set at 0.0 ppt, as the default. To change this setting, refer to “3.4.12 DO salinity compensation setting (D-55 )” page 88. Immerse the electrode in the sample. Mix the sample at a constant speed (1000 –...
  • Page 72 2 Taking Measurements 2.9 Dissolved oxygen (DO) measurement (D-55) ● Calibrating with standard solution Normally, air calibration is used to calibrate the meter when measuring DO. When a higher level of measuring precision is required, however, a two-point calibration using standard solution can be employed. Calibration order for zero standard solution and span calibration solution is arbitrary.
  • Page 73 2 Taking Measurements 2.9 Dissolved oxygen (DO) measurement (D-55) Wash the electrode with tap water, and then immerse it in the standard solution. Standard solution Mix the sample at a constant speed (1000 – 1500 rpm) during measurement, using magnetic stirrer. When the sample temperature rises due to the stirrer, use a temperature bath.
  • Page 74 2 Taking Measurements 2.9 Dissolved oxygen (DO) measurement (D-55) Zero standard solution and span standard solution are detected automatically. To conduct the second calibration in the two- point calibration, repeat steps 3 and 4. To return to the MEASUREMENT mode, press the MEAS key.
  • Page 75 2 Taking Measurements 2.9 Dissolved oxygen (DO) measurement (D-55) HORIBA...

  • Page 76: Functions

    3 Functions 3.1 Data memory function Functions This chapter describes the various functions of the meter. Data memory function The measured data can be stored automatically or manually. ● Auto data memory You can automatically store the data at certain intervals using this function.
  • Page 77 3 Functions 3.1 Data memory function Data cannot be stored unless the value has stabilized or in the CAL mode. When the data is stored, an ID number for that specific measurement can be registered (see “3.4.7 Sample ID# setting” page 84). ●...
  • Page 78 3 Functions 3.1 Data memory function Press the MODE key to display the data and time. Select the desired data item using the ▲ and ▼ keys. Press the MODE key to display the ID. Select the desired data item using the ▲ and ▼ keys.

  • Page 79: Ph Calibration History Display

    3 Functions 3.2 pH calibration history display pH calibration history display The latest calibration and repeatability check information can be checked. Refer to“pH repeatability check” on page 32. ● pH calibration history Press the CAL DATA key in the pH Measure- ment mode.
  • Page 80 3 Functions 3.2 pH calibration history display Latest calibration data Press the ▼ key with latest calibration date displayed. The asymmetrical potential will be displayed. Status Sensitivity display Asymmetrical potential display Sensitivity display 4-7 Example of 3-point calibration Press the ▼ key to show sensitivity display. Status display When the meter is in a good condition When the electrode needs washing...
  • Page 81 3 Functions 3.2 pH calibration history display ● Ion calibration history display (D-53 ) Press DATA Measurement mode. The latest ION measurement calibration date will be displayed. Latest calibration date Using the ▼ key, toggle between the latest cali- bration date display and the ION offset potential display, and sensitivity display(s).
  • Page 82 3 Functions 3.2 pH calibration history display The sensitivity is shown as follows in a 3-point calibration. Note that the symbol meanings are different than those notifying the completion of calibration. ： Sensitivity for Ion slope of +1 and +2: sensitivity for high concentration side Ion slope of -1 and -2: sensitivity for low concentration side ：...

  • Page 83: Displaying And Setting The Clock

    3 Functions 3.3 Displaying and setting the clock Displaying and setting the clock The clock needs to be when the meter is used for the first time or after replacing the batteries. ● Displaying the clock Press the MODE key in the Measurement mode to dis- play the clock.
  • Page 84 3 Functions 3.3 Displaying and setting the clock ● Setting the clock Press the CAL key when the Clock Display screen is displayed to show the Setting screen for the clock. Switch the display to year, month, day, hour, minute, and second using the ENTER key. You can set a numerical value using the ▲...

  • Page 85: Setting Modes

    3 Functions 3.4 Setting modes Setting modes Selecting the Setting mode expands the uses of the meter. 3.4.1 Entering the Setting mode Press the SET key in the Measurement mode. The Setting Mode Selection cursor appears at the left-bottom of the screen to indicate that the Setting mode is active.

  • Page 86: Display And Description

    3 Functions 3.4 Setting modes Press MEAS return Measurement mode from the Setting mode. 3.4.2 Display and description Model Page Display Name Description pH Buffer Sets the ○ ○ ○ ○ page standard solution for pH calibration. Temperature Selects the ○...
  • Page 87 3 Functions 3.4 Setting modes Model Page Display Name Description ION Unit Sets the unit − ○ − − page for ION measurement. ION Slope Selects ION − ○ − − page slope (number of electric charges). COND Unit Sets the unit −...

  • Page 88: Ph Standard Solution Setting

    3 Functions 3.4 Setting modes 3.4.3 pH standard solution setting The meter allows you to select the standard solution specifications used for calibration from among the NIST standard, US standard (USA), and use-defined standard (CUST). NIST When using the standard solution standard required by NIST standards Bottle mark...
  • Page 89 3 Functions 3.4 Setting modes Changing the standard solution setting Press the SET key in the Measurement mode and select the pH Buffer Setting mode. Press the ENTER key to toggle between NIST standard, US standard (USA) and a user- defined standard (CUST).
  • Page 90 3 Functions 3.4 Setting modes Calibration using user-defined standard (CUST) Press the CAL key in the pH Measurement mode to select the Calibration mode. “>CAL<“ will be displayed. Set the pH value of the standard solution used for calibration using the ▲ and ▼ keys. While the setting is being made, “CuSt”...

  • Page 91: Temperature Compensation Setting

    3 Functions 3.4 Setting modes 3.4.4 Temperature compensation setting Press the SET key in the Measurement mode to enter the Temperature Compensation Setting mode. Pressing the ENTER key toggles between MTC and ATC settings. Automatic temperature compensation (when using a temperature sensor of the electrode) ATC is displayed.

  • Page 92: Auto Data Storage Setting

    3 Functions 3.4 Setting modes 3.4.5 Auto data storage setting You can set the meter to automatically store data at certain intervals. Cancel the Auto Power OFF function. Press the SET key in the Measurement mode to enter the Data Storage Setting mode. Pressing the ENTER key toggles auto data storage function ON and OFF.
  • Page 93 3 Functions 3.4 Setting modes Carrying out auto data storage Press MEAS return Measurement mode. Press the ▲ key. Automatic data storage will commence. The first data is recorded when the preset time has reached the preset starting time. Do not turn the power ON/OFF during automatic data storage.

  • Page 94: Ph Calibration Frequency Setting

    3 Functions 3.4 Setting modes During automatic data storage, the MEAS, MODE, SET, ENTER, and CAL DATA keys cannot be used. Data recording time will differ ± 1 seconds from the time set by the storage interval. If the number of stored data items exceeds 300, data storage will stop and the error message “ERR No.

  • Page 95: Sample Id# Setting

    3 Functions 3.4 Setting modes 3.4.7 Sample ID# setting Setting the sample ID# records its sample ID number as well as the measured data at time the data is stored. Press the SET key in the Measurement mode to enter the ID# Setting mode. Use the ENTER key to select the digit.

  • Page 96: Ion Unit Setting (D-53 )

    3 Functions 3.4 Setting modes 3.4.8 Ion unit setting (D-53 ) Press the SET key in the Measurement mode and select the ION Unit Setting mode. Pressing the ENTER key toggles between g/L and mol/L for the unit setting. It is not possible to set different units for CH1 and CH2. Once the unit is changed, the previous calibration data will be lost.

  • Page 97: Ion Slope Setting (D-53)

    3 Functions 3.4 Setting modes 3.4.9 Ion slope setting (D-53) Press the SET key in the Measurement mode and select the ION Slope Setting mode. Specify a numerical value using the ▲ and ▼ keys. Setting range: -2, -1, +1, +2 Once the ION slope is changed, the previous calibration data will be lost.

  • Page 98: Temperature Coefficient Setting (D-54 )

    3 Functions 3.4 Setting modes 3.4.11 Temperature coefficient setting (D-54 ) Press the SET key in the Measurement mode and select the COND TC Setting mode. Pressing ENTER toggles temperature conversion ON and OFF. Specify a numerical value for the temperature coefficient using the ▲...

  • Page 99: Do Salinity Compensation Setting (D-55 )

    3 Functions 3.4 Setting modes 3.4.12 DO salinity compensation setting (D-55 ) Press the SET key in the Measurement mode and select the DO Salt Setting mode. Pressing the ENTER key toggles between seawater salinity (SEA) and a user-defined value. Specify a numerical value using the ▲...

  • Page 100: Do Atmospheric Pressure Compensation Setting (D-55 )

    3 Functions 3.4 Setting modes 3.4.13 DO atmospheric pressure compensation setting (D-55 ) Press the SET key in the Measurement mode and select the DO hpa Setting mode. Specify a numerical value using the ▲ and ▼ keys. Setting range: 100 to 1999 hPa 3.4.14 Maintenance mode Press the SET key in the Measurement mode and select the Maintenance mode.
  • Page 101 3 Functions 3.4 Setting modes ● Maintenance setting items Use the MODE key to toggle between Maintenance mode items. Item Page Item Description LCD check Enables check to see if all page LCD segments are displayed. Battery Enables simple battery page voltage check voltage check.
  • Page 102 3 Functions 3.4 Setting modes ● LCD check [item No. 00] Displays all segments of the LCD. Press the MODE key in the Maintenance mode to show item No. 00. Press the ENTER key. Compare the LCD screen with this diagram to confirm that all segments of the LCD are displayed.
  • Page 103 3 Functions 3.4 Setting modes ● Battery voltage check [item No. 01] The battery voltage (V) is displayed. Battery Item No. 01 The battery voltage alarm is set at approximately 2.2 V. The measured voltage for batteries depends on the current.
  • Page 104 3 Functions 3.4 Setting modes ● Temperature zero adjustment [item No. 02] This mode uses a known temperature to calibrate the temperature compensation value. This mode is used when calibrating the temperature of the thermometer. Press the ENTER key to toggle between CH1 and CH2.
  • Page 105 3 Functions 3.4 Setting modes ● Automatic power-off setting [item No. 03] This turns the Automatic Power-off function ON/OFF and sets the time until the power is turned off. When the Automatic Power-off function is set to ON, the power to the meter automatically turns off if the keys are not operated for the set amount of time.
  • Page 106 3 Functions 3.4 Setting modes ● pH/ION CH setting [item No. 04] (D-53 ) Both channels can be used to measure the pH and ions. Press the ENTER key to toggle between CH1 and CH2. ▲ ▼ Use the keys to select the pH/ION measurement channel.
  • Page 107 3 Functions 3.4 Setting modes ● Remaining data memory [Item No. 05] Displays the number of data items that can still be stored. Number of remaining data memory items Item No. 05 Press the MODE key to proceed to Data memory clear (item No.
  • Page 108 3 Functions 3.4 Setting modes ● Initialization of setting [item No. 07] This mode returns all settings to the default settings. Use this mode to return the pH meter to the original set- tings when the meter was purchased. Press the ENTER key to initialized the settings. Item No.
  • Page 109 3 Functions 3.4 Setting modes ● Printer connection and printing test [item No. 08] A printing test is conducted if a printer is connected. Press the ENTER key to start the printing test. When conditions are normal, “End” is displayed. When conditions are not normal, “Err”...

  • Page 110: Rs-232C Communications

    4 RS-232C communications 4.1 Cautions before use RS-232C communications This chapter describes RS232C communications and its communication commands. Cautions before use Use caution regarding the following points, when using RS-232C communications. ・ Use the following designated cable for connecting to the computer.
  • Page 111 4 RS-232C communications 4.1 Cautions before use ・ If data is requested but not received, create the program structure to have the data request repeated after a short waiting time. This will provide more reliable communications. ・ If RS-232C communications is not used, cover the RS-232C port with a rubber cap.

  • Page 112: Command List

    4 RS-232C communications 4.2 Command list Command list <CR><LF> terminator serial communication commands. All the commands (except the ON-LINE/OFF-LINE command) are valid only in the ON-LINE mode. (An error message is returned in the OFF-LINE mode.) The meter returns a response to any operation made in the following format: OK<CR><LF>...
  • Page 113 4 RS-232C communications 4.2 Command list ● On-line operations commands Command Command item Page No. Command Header code On-line/off-line page 104 Halt potential hunting page 108 pH Measurement mode designation page 104 mV Measurement mode designation page 105 Ion Measurement mode designation page 106 Conductivity Measurement mode page 106...
  • Page 114 4 RS-232C communications 4.2 Command list ● Request data commands Command Meters that can Request for ... Page No. Command use commands Header code pH calibration page 114 history D-53 Ion calibration page 116 history Clock data page 118 Measurements page 119 Number of stored page 121...

  • Page 115: On-Line Operation Commands

    4 RS-232C communications 4.3 On-line operation commands On-line operation commands This section explains the commands that control the operation of the pH meter. ● ON-LINE/OFF-LINE command format 0 or 1 (0: off-line, 1: on-line) Command code (on-line or off-line operation) Header Switching between on-line and off-line.
  • Page 116 4 RS-232C communications 4.3 On-line operation commands ● mV Measurement mode designation command format Channel number (1 or 2) Command code (mV Measurement mode designation) Header ・ This command is always valid when on-line. ・ The meter changes the status to mV Instantaneous display for the selected channel number.
  • Page 117 4 RS-232C communications 4.3 On-line operation commands ● Ion Measurement mode designation command format (D- 53 ) Channel number (1 or 2) Command code (Ion Measurement mode designation) Header ・ This command is always valid when on-line. ・ The meter changes the status to Ion Instantaneous Value display for the selected channel number.
  • Page 118 4 RS-232C communications 4.3 On-line operation commands ● Dissolved Oxygen Measurement mode designation command format (D-55 ) Command code (Dissolved Oxygen Measurement mode designation) Header ・ This command is always valid when on-line. ・ The meter enters Dissolved Oxygen Instantaneous Value display. ・...
  • Page 119 4 RS-232C communications 4.3 On-line operation commands ● Halt potential hunting command format Channel number (1 or 2) Command code (Measurement halt) Header ・ This command is valid when on-line only during measurement on AUTO HOLD. ・ Issuing this command halts measurement on AUTO HOLD.
  • Page 120 4 RS-232C communications 4.3 On-line operation commands ● Start ion calibration command format (D-53 ) Prefix for the unit of the calibration value to be set 0: -; 1: m; 2: μ The set unit determines which unit is used, either mol/L or g/L. Calibration value being set Command code (Ion calibration start) Header...
  • Page 121 4 RS-232C communications 4.3 On-line operation commands ● Start conductivity cell constant calibration command for- mat (D-54 ) Prefix for the unit of the calibration value to be set 0: -; 1: m; 2: μ The set unit determines which unit is used, either S/m or S/cm.
  • Page 122 4 RS-232C communications 4.3 On-line operation commands ● Start DO calibration command format (D-55 ) Calibration method to be set (one digit) 0: Air calibration 1: Standard solution calibration Command code (DO calibration start) Header ・ This command is valid when on-line, when DO measurement or calibration are on HOLD.
  • Page 123 4 RS-232C communications 4.3 On-line operation commands ● Data clear command format Command code (Data clear) Header ・ This command clears the data stored in the memory. ● Data IN specification command format Command code (Data IN specification) Header ・ Valid only when manual data memory is set. ●...

  • Page 124: Data Request Commands And Responses

    4 RS-232C communications 4.4 Data request commands and responses Data request commands and responses This section explains the commands that request meter data. ● Format of responses from meter When no operation can be received ER, n [CR][LF] n = 0: Communications error 1: Command code does not exist 2: Unacceptable timing entered 3: Data exceeds range...
  • Page 125 4 RS-232C communications 4.4 Data request commands and responses ● pH calibration history request command and response Request command format Channel number (1 or 2) Command code Header pH meter response format Channel number (1 or 2) Asymmetric potential (5-digit value including decimal point and sign) Temperature setting 1-digit, 0: ATC, 1: MTC Calibration result 0: good;...
  • Page 126 4 RS-232C communications 4.4 Data request commands and responses ・ The format is of fixed length. When there is no data, enter a [SP]. ・ The latest calibration date and time are output. ・ The calibration data is transmitted only for the number of calibration points used.
  • Page 127 4 RS-232C communications 4.4 Data request commands and responses ● Ion calibration history request command and response (D-53 ) Request command format Channel number, 1-digit, 1: 1CH 2: 2CH Command code Header pH meter response format Asymmetric potential (5-digit value including decimal point and sign) Temperature setting 1-digit, 0: ATC, 1: MTC Calibration result 0: good;...
  • Page 128 4 RS-232C communications 4.4 Data request commands and responses Slope data ・ When results exceed 999.9 or are negative, the output is [SP][SP][SP][SP][SP]. ・ The year/month/day are output for each calibration point. D-52/53/54/55...
  • Page 129 4 RS-232C communications 4.4 Data request commands and responses ● Clock data request command and response Request command format Command code Header pH meter response format Seconds, 2-digit, 0 - 59 Minutes, 2-digit, 0 - 59 Hours, 2-digit, 0 - 23 Day, 2-digit, 01 - 31 Month, 2-digit, 01 - 12 Year, 4-digit (A.D.;...
  • Page 130 4 RS-232C communications 4.4 Data request commands and responses ● Measurement request command and response Request command format Command code Header pH meter response format Measurement value, 6- digit In the case of pH, ion, and conductivity (lead zero is supressed).
  • Page 131 4 RS-232C communications 4.4 Data request commands and responses Error code Error No. display, 2-digit (One error No. which takes precedence over others is output.) When the measurement/calibration type is 0: The latest data is output regardless of occurrence of measurement errors. 1: [SP] is output when any calibration error is produced.
  • Page 132 4 RS-232C communications 4.4 Data request commands and responses ● Request command for number of stored data items and its response Request command format Command data Header Meter response format Number of data items Header D-52/53/54/55...
  • Page 133 4 RS-232C communications 4.4 Data request commands and responses ● Request command for memory data and its response Request command format Memory No. Command code Header HORIBA...
  • Page 134 4 RS-232C communications 4.4 Data request commands and responses Meter response format Sample ID 0: Manual data IN 1: Auto data IN Memory No. Header Measurement value, 6-digit In the case of pH, ion, and conductivity (lead zero is supressed). Shows measured value in the case of mV also.
  • Page 135 4 RS-232C communications 4.4 Data request commands and responses Error code Error No. display, 2-digit (One error No. which takes precedence over others is output.) When the measurement/calibration type is 0: The latest data is output regardless of occurrence of measurement errors. 1: [SP] is output when any calibration error is produced.
  • Page 136 4 RS-232C communications 4.4 Data request commands and responses ● Request command for model and its response Request command format Command code Header Meter response format Lot No. (7-digit) Model 2: D-52 3: D-53 4: D-54 5: D-55 Header ● Request command for software version and its response Request command format Command code Header...

  • Page 137: Communication Example Using The Hyperterminal

    4 RS-232C communications 4.5 Communication example using the HyperTerminal Communication example using the HyperTerminal For reference, communication using the HyperTerminal that comes with Windows is described here. Open the HyperTerminal. [Start] > [Programs] > [Accessories] > [Communications] > [HyperTerminal] The HyperTerminal program (Hypertrm.exe) is activated.
  • Page 138 4 RS-232C communications 4.5 Communication example using the HyperTerminal [File] > [Properties] > [Settings] > [ASCII Setup] check contents transmitted HyperTerminal by enabling the “Echo typed characters locally (E)” option. Command input If a command is input, the corresponding response data is sent back.
  • Page 139 4 RS-232C communications 4.5 Communication example using the HyperTerminal HORIBA...

  • Page 140: Printer

    5 Printer 5.1 Connecting the printer Printer This chapter explains the printer connection, the times printing takes place, and printing formats. Connecting the printer The following printers are compatible with D-52/53/54/ Printers ・ Citizen CBM-910-24RJ100-A (Normal paper) ・ Seiko DPU-H245AS-A03A (Heat-sensitive paper) Attach the printer cable to the printer output connector.

  • Page 141: Printer Setting

    5 Printer 5.2 Printer setting Printer setting Set up the printer using these settings: ・ Printer output baud rate: 2400 bps ・ Bit length: 8 bits ・ Parity: none Setting for a plain paper printer (CBM-910) Set DIP switch No. 6 to ON and No. 7 to OFF, and pre- pare the printer paper and ink ribbon.

  • Page 142: Printer Output Timing

    5 Printer 5.3 Printer output timing Printer output timing The printer prints at the following times: ・ When pressing the ENTER key after Auto Hold or while the instantaneous value is being displayed in the Measurement mode. ・ When the manual data memory storage is performed in the Measurement mode.

  • Page 143: Printing Format

    5 Printer 5.4 Printing format Printing format The following are sample printouts. 5.4.1 When the ENTER key is pressed in the Measurement mode ● pH Measurement mode ① When the data is the data con- ③ firmed with Auto Hold, “HOLD” is ①...
  • Page 144 5 Printer 5.4 Printing format ● COND Measurement mode ① When the data is the data con- ③ ① firmed with Auto Hold, “HOLD” is shown. Nothing is displayed for the ④ ② instantaneous value measurement. ② ID#: 5 digits ③...

  • Page 145: When The Manual Data Memory Storage Is Performed In The Measurement Mode

    5 Printer 5.4 Printing format 5.4.2 When the manual data memory storage is performed in the Measurement mode The printer prints the data memory No. in the first line and the data in accordance with the format same with the one in “5.4.1 When the ENTER key is pressed in the Measurement mode”...

  • Page 146: When Calibration Or Check Is Performed In The Calibration Mode

    5 Printer 5.4 Printing format 5.4.4 When calibration or check is performed in the Calibration mode pH calibration When calibration is performed When pH repeatability pH 0.00 is checked When an error has occurred When calibration is performed COND cell constant calibration When calibration is performed DO atmospheric pressure calibration...
  • Page 147 5 Printer 5.4 Printing format DO standard solution calibration When calibration is performed When an error has occurred HORIBA...

  • Page 148: When The Enter Key Is Pressed In The Calibration History Display

    5 Printer 5.4 Printing format 5.4.5 When the ENTER key is pressed in the calibration history display ● pH calibration history (without check data) Electrode status: CALIBRATION ; BAD Asymmetrical Date ; 2003/ 1/ 1 GOOD: good condition potential at mV Value ;...

  • Page 149: Test Printing Format In The Maintenance Mode

    5 Printer 5.4 Printing format ● Ion calibration history GOOD: Calibration is per- formed Sensitivity display Calibration Standard solution value is data displayed. No calibration/1-point calibration: None 2-point calibration: 1st item 3-point calibration: 2nd item 5.4.6 Test printing format in the Maintenance mode HORIBA...

  • Page 150: Maintenance And Troubleshooting

    6 Maintenance and Troubleshooting 6.1 pH (ORP) electrode maintenance Maintenance and Troubleshooting This chapter explains how to perform daily meter maintenance and how to deal with error messages. Daily maintenance is vital in assuring accurate measurement and preventing breakdowns before they occur. Maintenance of the electrodes is especially important;...
  • Page 151 6 Maintenance and Troubleshooting 6.1 pH (ORP) electrode maintenance The liquid junction may become clogged if the electrode is left in distilled water. ● Extended storage When an electrode is not to be used for a long period of time, store the electrode after performing the following steps.
  • Page 152 6 Maintenance and Troubleshooting 6.1 pH (ORP) electrode maintenance Fill the electrode with new internal solution (#300), until it nears the opening. Wash the tip of the electrode well with pure (de- ionized) water and wipe it with filter paper or tissue paper.
  • Page 153 6 Maintenance and Troubleshooting 6.1 pH (ORP) electrode maintenance ● Washing the electrodes If the tip of the pH electrode is extremely dirty, the speed of its response may slow and it may cause errors in measurement. If the electrode is so dirty that it cannot be cleaned by rinsing with pure (de-ionized) water, wash the electrode using the most appropriate method below.

  • Page 154: Ion Electrode Maintenance

    6 Maintenance and Troubleshooting 6.2 ION electrode maintenance ION electrode maintenance Refer to the electrode operation manual for how to take care of each kind of electrode. ● ION electrodes Elect- Compatible Ion to be Slope Measurement Reference rode tip model measured type ( * )
  • Page 155 6 Maintenance and Troubleshooting 6.2 ION electrode maintenance ● Before using Before using an electrode, condition the electrode according to the following table to prepare it for measurement. ION electrode Conditioning agent Time No conditioning ION electrode ION electrode 1 mol/L potassium nitrate Approx.
  • Page 156 6 Maintenance and Troubleshooting 6.2 ION electrode maintenance ● Short-term storage Immerse electrodes in the following solutions, when they are to be stored for up to one day and then reused. ION electrode Storage solution de-ionized water ION electrode ION electrode 1 mol/L potassium nitrate solution ION electrode (100 g/L KNO...

  • Page 157: 65Xx-10C Electrode Maintenance

    6 Maintenance and Troubleshooting 6.2 ION electrode maintenance 6.2.1 65XX-10C electrode maintenance Refer electrode operation manuals maintenance concerning other electrode models. ● Long-term storage Remove the tip electrode from the combined electrode and put on the rubber cap. Put the electrode protective cap on. (Do not put water in the protective cap, and make sure it is dry.) Store both the tip electrode and the combined...
  • Page 158 6 Maintenance and Troubleshooting 6.2 ION electrode maintenance following operations to make the reference solution seep out from the liquid junction. Reference solution outflow Remove the protective tube from the combined electrode so that the rubber cap is mounted on the tip-type ION electrode part.
  • Page 159 6 Maintenance and Troubleshooting 6.2 ION electrode maintenance To fill an electrode with internal solution (inner tube), the electrode must be disassembled. Use sufficient care during disassembly. Items necessary when replacing internal solution are: a syringe, #330 (gel) reference solution, and the reference solution specified for the particular electrode.
  • Page 160 6 Maintenance and Troubleshooting 6.2 ION electrode maintenance electrode until the internal solution nears the filler port. Filling the electrode: assembly procedure Return the silicon tube to its original position and seal the internal solution filler port (inner tube). (Make sure that the filler port is completely sealed.) If the bodies (internal and external) or the liquid junction (tip) are dirty, wash them with pure (de-...
  • Page 161 6 Maintenance and Troubleshooting 6.2 ION electrode maintenance Make the internal solution seep out from the liquid junction in accordance with the section entitled “ ● Daily maintenance” page 146. Store the electrode in accordance with the sec- tion entitled “ ● Short-term storage” page 145. Cable Rubber sleeve Electrode cap...

  • Page 162: Conductivity Electrode Maintenance

    6 Maintenance and Troubleshooting 6.3 Conductivity electrode maintenance Conductivity electrode maintenance Refer to the electrode operation manuals for how to maintain each electrode. Long-term storage When an electrode will not be used for a long period of time, store it after performing the following procedure. Also, perform maintenance on the electrode every three to six months.

  • Page 163: Dissolved Oxygen Electrode Maintenance

    6 Maintenance and Troubleshooting 6.4 Dissolved oxygen electrode maintenance Dissolved oxygen electrode maintenance Refer to the electrode operation manuals for how to maintain each electrode. 6.4.1 Field-use electrode ● Maintenance after daily use Wash the electrode well with tap water. Store the DO tip by immersing it in tap water.
  • Page 164 6 Maintenance and Troubleshooting 6.4 Dissolved oxygen electrode maintenance ● Long-term storage Remove the electrode from the pH meter. Wash the electrode well with pure (de-ionized) water, and then remove the water drops using cotton gauze. Remove the DO tip from the holder. Place the socket over the DO tip, and then store it by placing it in its original packaging and sealing it air-tight.

  • Page 165: Laboratory-Use Electrode

    6 Maintenance and Troubleshooting 6.4 Dissolved oxygen electrode maintenance 6.4.2 Laboratory-use electrode ● Maintenance after daily use Wash the electrode well with pure (de-ionized) water. Wash-bottle containing de- ionized water Membrane Store the DO tip by immersing it in zero standard solution.
  • Page 166 6 Maintenance and Troubleshooting 6.4 Dissolved oxygen electrode maintenance ● Long-term storage Remove the electrode from the pH meter. Wash the electrode well with pure (de-ionized) water, and then remove the water drops using cotton gauze. Remove the DO tip from the electrode body. Push the socket onto the DO tip, and then store it by placing it in its original packaging and sealing it air-tight.

  • Page 167: Troubleshooting

    6 Maintenance and Troubleshooting 6.5 Troubleshooting Troubleshooting The meter is equipped with a simply error-message function to notify the operator that an operation error or problem with the equipment has occurred. Errors or other problems that occur while in the Measurement mode are announced by an error No.
  • Page 168 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● ERR No. 01 Memory error Explanation Data cannot be read from or written to the internal memory. Cause How to solve problem The pH meter Take the battery from the pH meter, does not start and disconnect the AC adapter.
  • Page 169 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● ERR No.03 Electrode stability error Explanation The electric potential did not stabilize within three minutes. Cause How to solve problem This is caused by Press the MEAS key again while the sample “HOLD” is either brinking or steadily solution (when lit in the display, to measure the the sample...
  • Page 170 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● ERR No.04 Asymmetric potential error Explanation The asymmetric potential of the electrode is 45 mV or more. Cause How to solve problem The electrode is Wash the electrode. dirty. The electrode is Replace the electrode. cracked.
  • Page 171 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● ERR No.05 Electrode sensitivity error (pH) Explanation The electrode sensitivity is either 105% or more or 85% or less than the theoretical sensitivity. Cause How to solve problem The electrode is Wash the electrode. dirty.
  • Page 172 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● ERR No.05 Electrode sensitivity error (DO) Explanation If there was something wrong with the DO calibration, re-calibrate after taking the appropriate measures listed below. Cause How to solve problem The settings Reconfirm each setting (temperature, (temperature, correction of salinity correction of...
  • Page 173 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● ERR No.06 Max. calibration points exceeded Explanation Calibration was performed on a fourth calibration point. Cause How to solve problem Calibration was Limit the number of calibration performed on a points to three. fourth calibration This error message is cleared by point.
  • Page 174 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● ERR No.07 Cannot identify standard solution Explanation If the automatic standard-solution identification function of the meter does not work, recalibrate the meter after performing the appropriate measures below. Cause How to solve problem There is a Prepare new standard solution.
  • Page 175 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● ERR No.09 Printer error Explanation If a problem occurs with the printer, turn OFF the power to the meter, perform the appropriate measure below, and turn the power to the meter back ON. Cause How to solve problem The printer...
  • Page 176 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● ERR No.11 Cell constant out of range Explanation The cell constant is out of the range of 0.7 to 1.3. Delete data stored in the memory after confirming their con- tents. Cause How to solve problem COND electrode Replace the electrode.

  • Page 177: More Troubleshooting

    6 Maintenance and Troubleshooting 6.5 Troubleshooting 6.5.2 More troubleshooting This section explains how to respond to various symptoms of trouble that are not indicated by an error number. ● Nothing shows up on the display when the power is turned ON Cause How to solve problem No batteries...
  • Page 178 6 Maintenance and Troubleshooting 6.5 Troubleshooting Cause How to solve problem There is no Fill the electrode with new reference reference solution, as noted in the electrode solution operation manual. remaining. The wrong Use the correct reference solution. reference solution is being used.
  • Page 179 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● The response is slow Cause How to solve problem Some effects of Response time may slow down, the sample depending on the properties of the sample solution. The electrode is Wash the responsive membrane. dry or dirty.
  • Page 180 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● The measured value is blinking The pH value exceeds the measurement range (when pH value is displayed). Measurement range: pH 0.00 – pH 14.00 The mV value exceeds the measurement parameters (when mV value is displayed). Display range: ±1999 mV The ION measurement value is out of the range (in the ION mode).
  • Page 181 6 Maintenance and Troubleshooting 6.5 Troubleshooting Check this point As shown in the diagram, use a jumper wire or bent paper clip to short the meter by touching both the center pin and some metal part in the electrode connector. If the flaching measured value disappears when this done, the meter is nomal.
  • Page 182 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● The temperature display is blinking. The temperature display does not change from 25ºC. temperature measurement exceeds measurement range. Measurement range: -10 – 100.0ºC Cause How to solve problem The temperature Check the temperature of the of the sample sample solution and change to a solution...
  • Page 183 6 Maintenance and Troubleshooting 6.5 Troubleshooting ● Measurements are not repeatable Cause How to solve problem Some effects of The pH or other properties of the the sample sample solution may have changed solution over time, making repeatability poor. The responsive Wash the responsive membrane.

  • Page 184: Reference

    7 Reference Reference This chapter provides simple compilation information for those who would like to know about the functions of the main unit of the meter and other measurement principles in greater detail. It also serves as a reference for spare and optional parts.

  • Page 185: Ph Measurement

    7 Reference 7.1 pH measurement pH measurement ● pH measurement and temperature The temperature of the solution being inspected is an important parameter in the accurate measurement of pH. There are many possible sources of errors during measurement, such as the state of the solution junction potential, asymmetric potential, and reference solution pH concentration, but all of these items contain factors that change with temperature.
  • Page 186 7 Reference 7.1 pH measurement ● Asymmetric potential The glass electrode is immersed in a pH 7 reference solution. When the electrode is immersed in the pH 7 solution, both the internal and external sides of the electrode membrane are supposed to take on a pH of 7, making the potential 0.
  • Page 187 7 Reference 7.1 pH measurement ● Temperature compensation The electromotive force generated by the glass electrode changes depending on the temperature of the solution. “Temperature compensation” is used to compensate for the change in electromotive forces caused by temperature. There is absolutely no relation between the change in pH caused by the temperature of the solution and temperature compensation.
  • Page 188 7 Reference 7.1 pH measurement pH values of pH standard solutions at various temperatures (NIST (former NBS) settings) pH 12.45 pH 6.86 standard pH 1.68 pH 4.00 pH 9.18 standard solution standard standard standard Temp. solution Saturated solution solution solution (°C) Neutral calcium...
  • Page 189 7 Reference 7.1 pH measurement pH values of pH 7 and pH 10 standard solutions at various temperatures (US-standard settings) pH 7 pH 10 standard standard Temp. solution solution (°C) Neutral Carbonate phosphate 7.119 10.318 7.086 10.245 7.058 10.178 7.035 10.117 7.015 10.061...
  • Page 190 7 Reference 7.1 pH measurement ● Using standard solutions Standard solutions are used to calibrate the scale of the pH meter employed to measure the unknown pH of a solution. Standard solutions of pH 4, 7, and 9 are used in combination according to the particular conditions of the solution that is to be inspected.

  • Page 191: Mv (Oxidation-Reduction Potential [Orp]) Measurement

    7 Reference 7.2 mV (oxidation-reduction potential [ORP]) measurement mV (oxidation-reduction potential [ORP]) measurement ● ORP principles ORP is an abbreviation for oxidation-reduction potential. ORP is the energy level (potential) determined according to the state of equilibrium between the (z-n)+ oxidants (M ) and reductants (M ) that coexist within a solution.
  • Page 192 7 Reference 7.2 mV (oxidation-reduction potential [ORP]) measurement For example, for a solution in which trivalent iron ions coexist with bivalent iron ions, equations ① and ② would be as follows. ⇔ Fe •••••• ① ' - - - - - - - - - - - - - - - - - - ••••••...
  • Page 193 7 Reference 7.2 mV (oxidation-reduction potential [ORP]) measurement ● Standard electrode (reference electrode) types and ORP The ORP of a solution that is obtained through measurement is a value that corresponds to the reference electrode employed. If different kinds of reference electrodes are used for measurement, the ORP value of the same solution may appear to be different.
  • Page 194 7 Reference 7.2 mV (oxidation-reduction potential [ORP]) measurement ● ORP standard solution There are two kinds of standards substances. Under normal circumstances, it is sufficient to use only that type of substance which is closest to the measured value. Indicated value of ORP standard solution at various temperatures (mV) 160 - 22 160 - 51...
  • Page 195 7 Reference 7.2 mV (oxidation-reduction potential [ORP]) measurement Operation check using standard solution Standard solution is not used only for the calibration of the meter, but to confirm whether or not the condition of electrodes is good. Add 250 mL pure (de-ionized) water to one packet of any of the previously listed standard solutions and mix well.
  • Page 196 7 Reference 7.2 mV (oxidation-reduction potential [ORP]) measurement If the prepared ORP standard solution is allowed to stand in open air for one hour or more, it may undergo transformation. For this reason prepared ORP standard solution cannot be stored. When measuring a solution that has low concentrations of oxidants and reductants after conducting an operational check using a standard substance, the...

  • Page 197: Ion Measurement

    7 Reference 7.3 Ion measurement Ion measurement ● Ion concentration measurement When certain ions exist within the solution that is to be measured, the responsive ION electrode membrane generates an electric potential corresponding to the concentration of the ions. The potential that is generated is measured by the ION meter, using the reference electrode as the standard.
  • Page 198 7 Reference 7.3 Ion measurement When actual measurement is performed, the ION electrode measures the ION concentration, so a linear relationship forms between the value of the ION concentration and the electrode potential, if the concentration is plotted on a logarithmic axis, as shown in Fig.
  • Page 199 7 Reference 7.3 Ion measurement ● Standard solution Finding the ION concentration of the solution being measured requires prior calibration of the ION meter using a prepared standard solution with a known ION concentration. The number of times the meter is to be calibrated depends on the accuracy desired.
  • Page 200 7 Reference 7.3 Ion measurement tested, the larger the errors that may occur in calculation. ● Handling standard solution after use Standard solution that has been used should not be returned to the original container. It should be discarded. ● Storing standard solution Standard solution must be stored in an air-tight container and should be kept in a cool, dark place.

  • Page 201: Conductivity Measurement

    7 Reference 7.4 Conductivity measurement Conductivity measurement ● Electrode sensitivity check The cell constant of a conductivity electrode may vary, depending on the sample solution. Check the cell constant by measuring conductivity, using the following solutions, at least once every three months. Electrode Solution Conductivity...
  • Page 202 7 Reference 7.4 Conductivity measurement ● Measuring conductivity “Conductivity” is an index that expresses the ease with which electric current flows through a material. Conductors categorized either “electron conductors” (such as metals and other substances which use free electrons to conduct electricity) or “ion conductors”...
  • Page 203 7 Reference 7.4 Conductivity measurement in Ω) is in inverse proportion to the area A (expressed in ) of the pole plates, as is the case with metal and other conductors, and is proportional to the distance l (expressed in m) between the two pole plates. These relationships are expressed by equation 1, below.
  • Page 204 7 Reference 7.4 Conductivity measurement ● New units (SI units) New measurement units, called SI units, have come into use in recent years. Accordingly, the meter also uses SI units. The following conversion table is provided for people who are used to using the conventional kind of conductivity meter.
  • Page 205 7 Reference 7.4 Conductivity measurement standard), within a range where the size of the temperature change is not very large. The meter is equipped with a built-in automatic temperature conversion function, enabling them to automatically calculate and display, based on the actual temperature measurement, the conductivity of a sample at 25ºC, using a temperature coefficient of 2%/ºC.
  • Page 206 7 Reference 7.4 Conductivity measurement ● Conductivity and temperature coefficients for various solutions The following table shows the conductivity (converted to 25 ºC) and the temperature coefficient at that time, for various kinds of solution. Temp. Temp. Sub- Conc. Cond. Sub- Conc.
  • Page 207 7 Reference 7.4 Conductivity measurement Temp. Temp. Sub- Conc. Cond. Sub- Conc. Cond. Temp. Temp. coef. coef. (ºC) stance (wt%) (S/m) stance (ºC) (wt%) (S/m) (%/°C) (%/°C) 20.85 1.21 9.18 1.98 39.15 1.28 17.76 1.86 65.27 1.45 25.86 1.71 68.00 1.78 33.65 1.61 54.05 1.93 40.25 1.54...

  • Page 208: Dissolved Oxygen Measurement

    7 Reference 7.5 Dissolved oxygen measurement Dissolved oxygen measurement ● Measuring dissolved oxygen “Dissolved oxygen” (DO) is the concentration of oxygen that is dissolved in water. DO is essential in the self- cleaning mechanism of rivers and seas and for fish and other aquatic animals.
  • Page 209 7 Reference 7.5 Dissolved oxygen measurement The DO measurement method that is based on this principle is called the “Membrane electrode method.” This is a much simpler and more convenient way of measuring DO than using chemical analysis, which requires complex pretreatment in order to eliminate the effects of reductants and oxidants in the sample.
  • Page 210 7 Reference 7.5 Dissolved oxygen measurement when air is made to saturate water at a high elevation, where the air pressure is, for example, 506.5 hPa (which is equal to 1013 hPa × 1/2), the DO will be 4.06 mg/L (which is equal to 8.11 mg/L ×...

  • Page 211: Specifications

    7 Reference 7.6 Specifications Specifications ● Measurement target Target Item Description Measurement Glass electrode principle Display range pH -2.00 – 16.00 Measurement pH 0.00 – 14.00 ○ ○ ○ ○ range Resolution 0.01 pH Repeatability ±0.01 pH ±1digit Measurement Thermistor principle Measurement 0.0 –...
  • Page 212 7 Reference 7.6 Specifications Target Item Description Measurement 2 AC bipola method principle Measurement Cell constant 100 m range 0.000 mS/m – 19.99 S/m   Cell constant 10 m Conductivity − − ○ − 0.0 µS/m – 1.999 S/m Cell constant 1000 m 0.00 mS/m –...

  • Page 213: Default Settings

    7 Reference 7.7 Default settings Default settings Category Item Default values Common Temperature Automatic setting compensation temperature compensation Manual temperature 25 ºC compensation Automatic power OFF Approx. 30 min (ON) Sample ID 00000 Calibration cycle Auto data memory Standard calibration NIST solution Calibration setting...

  • Page 214: Operation Flowcharts

    7 Reference 7.8 Operation flowcharts Operation flowcharts The following summarizes the operational flow for each of the pH meter models. ● D-52 basic operation flow *1) pH Measurement mode *3) Calibration mode (instantaneous (instantaneous value) value) *2) Auto Hold Measurement Auto Hold calibration Clear Hold Automatic release of Hold...
  • Page 215 7 Reference 7.8 Operation flowcharts ● D-53 basic operation flow *1) pH Measurement (CH1) mode *3) Calibration mode (instantaneous value) (instantaneous value) *2) Auto Hold Measurement Auto Hold calibration Automatic release of Hold Clear Hold *4) mV Measurement (CH1) mode *6) Relative mV Measurement mode (instantaneous value) *7) Auto Hold Measurement...
  • Page 216 7 Reference 7.8 Operation flowcharts ● D-54 basic operation flow *1) pH Measurement (CH1) mode *3) Calibration mode (instantaneous value) (instantaneous value) *2) Auto Hold Measurement Auto Hold calibration Automatic release of Hold Clear Hold *4) mV Measurement (CH1) mode *6) Relative mV Measurement mode (instantaneous value) *7) Auto Hold Measurement...
  • Page 217 7 Reference 7.8 Operation flowcharts ● D-55 basic operation flow *1) pH Measurement (CH1) mode *3) Calibration mode (instantaneous value) (instantaneous value) *2) Auto Hold Measurement Auto Hold calibration Automatic release of Hold Clear Hold *4) mV Measurement (CH1) mode *6) Relative mV Measurement mode (instantaneous value) *7) Auto Hold Measurement...

  • Page 218: Pin Layout Of Special Cables

    7 Reference 7.9 Pin layout of special cables Pin layout of special cables 7.9.1 RS-232C communications cable Meter main unit Printer MINI DIN8M D-SUB 9-PIN 2;CTS − 7;RTS 3;TXD − 2;RXD − 4;GND 5;GND 5;RXD − 3;TXD 7.9.2 Cable for CITIZEN printer CBM-910-24RJ100-A Meter main unit Printer...

  • Page 219: Spare And Optional Parts

    7 Reference 7.10 Spare and optional parts 7.10 Spare and optional parts This section lists spare and optional parts for the pH meter. These parts are available through HORIBA distributors. Place an order specifying their name, model, and part number. 7.10.1 Spare parts list ●...
  • Page 220 7 Reference 7.10 Spare and optional parts ● ORP electrode (with built-in temperature sensor) Part name Model Part number Remarks Standard ORP 9300-10D 9096000400 Flat platinum type electrode ● ORP electrode (without built-in temperature sensor) Part name Model Part number Remarks ORP electrode 6861-...
  • Page 221 7 Reference 7.10 Spare and optional parts Spare tip for ION electrode Part name Model Part number Remarks Chloride ION tip 7660 9003015000 For 6560-10C Fluoride ION tip 7661 9003015100 For 6561-10C Nitric acid ION 7681 9003015200 For 6581-10C Potassium ION 7682 9003015300 For 6582-10C Calcium ION tip...
  • Page 222 7 Reference 7.10 Spare and optional parts Internal reference solution for ION electrodes Part name Model Part number Remarks Internal 9037006700 6560-10C reference For outer tube: 50 mL solution for chloride ion Internal 9003003200 6561-10C, reference 6583-10C solution for For outer tube: 250mL fluoride ion Internal 9037006600 6581-10C...
  • Page 223 7 Reference 7.10 Spare and optional parts *1): The pH electrode and conductivity electrode interfere with each other when both are immersed in the same sample container and measurements are made at the same time. Make sure each measurement is made one at a time with only one electrode in the sample.
  • Page 224 7 Reference 7.10 Spare and optional parts ● pH standard solution Part name Model Part number Remarks pH2 standard 100-2 9003001500 500 mL solution Accuracy: ±0.02 pH pH4 standard 100-4 9003001600 solution pH7 standard 100-7 9003001700 solution pH9 standard 100-9 9003001800 solution Part name...
  • Page 225 7 Reference 7.10 Spare and optional parts ● Internal reference solution Part name Model Part number Remarks Internal #300 9003003200 250 mL reference solution ● Cleaning liquid Part name Model Part number Remarks Cleaning liquid #220 9096002500 For pH, ORP, and ION for electrodes electrodes HORIBA...

  • Page 226: Options

    7 Reference 7.10 Spare and optional parts 7.10.2Options Part name Part number Remarks AC adapter 9096003100 Be sure to purchase the AC adapter For Japan 9096003200 cable when for the pH Cable For US 9096003300 purchasing the meter AC adapter. For Europe 9096003400 For Japan...
  • Page 227 For more information, please contact us: ExpotechUSA 10700 Rockley Road Houston, Texas 77099 281-496-0900 [voice] 281-496-0400 [fax] E-mail: sales@expotechusa.com Website: www.ExpotechUSA.com...

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