Z Base; Z Actual; Aga8 Comp - Siemens SITRANS FUG1010 IP65 NEMA 4X Instruction Manual
Ultrasonic flowmeters
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Also See for SITRANS FUG1010 IP65 NEMA 4X:
- Operating instructions manual (271 pages) ,
- Quick start manual (194 pages)
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Section 4
4.3.7 Z Base
The [Z Base] menu cell allows entry for the compressibility factor, at base conditions, for a given gas
composition. If using the internal AGA8 compensation, Z Base should be set appropriately for the gas
composition.
4.3.8 Z Actual
The [Z Actual] menu cell allows for a fixed entry of the compressibility factor in cases where pressure,
temperature and gas composition do not vary significantly. If standard volume compensation is desired
(refer to paragraph 4.6.2 STD VOL CORR) then enter the average compressibility factor for the specific
gas application.
4.3.9 AGA8 COMP
All FUG1010GCN gas flowmeters include a facility for performing internal volume compensation using
an AGA8 lookup table. This volume correction method is suitable and accurate for applications where the
gas composition does not vary significantly or where the gas is infrequently sampled (not automatically
sampled).
NOTE: In cases where automatic sampling is performed, a gas flow computer must be used in
conjunction with the FUH1010GCN to provide the most accurate volume compensated
flow output.
The internal AGA8 lookup table provides the meter with the actual gas density (Kg/M
ity factor (Z Actual) for the indicated pressure and temperature (as obtained via the analog input or fixed
P/T entry). These values are then used to compute either mass flow rate or standard volume corrected
flow rate as indicated in the Flow/Total Units menu.
The table must first be generated externally using a software package which computes the appropriate
density and compressibility factors for the specified gas composition. Note: Siemens recommends
using SonicWare (Lomic Inc.) to generate this lookup table. After the lookup table is generated and
appropriately formatted, it can then be downloaded to the FUG1010GCN via the serial data port. At any
time during operation a new table may be downloaded to the FUG1010GCN, should a change in gas
composition require the calculation of new Z-factors and Density values.
The AGA8 lookup table is essentially a 10 x 10 array or grid containing both Z-factor and Density, with a
10 point temperature and 10 point pressure index. Based on the current temperature and pressure
measurement, Z-factor and Density are interpolated to provide accurate volume correction. The table
should be configured to cover the full range of operating temperature and pressure, however, if the
measured pressure or temperature fall outside the table limits the FUG1010GCN lookup algorithm will
extrapolate the Z-factor and Density values accordingly.
If a gas composition was provided to Siemens with the purchase order, then the meter may already be
configured for the specified gas composition and would be indicated in the documentation provided with
each meter. If a new table or an updated table is required, follow the AGA8 table generation and instal-
lation instructions below.
NOTE: Table values are installed into the meter using a facility providing direct access to many
system variables without error handling, therefore, care should be exercised during the
formatting of this table prior to downloading to the flowmeter.
When generating an AGA8 lookup table follow these guidelines (refer to Example #1).
The table values for pressure must be arranged in ascending order and consist of exactly 10
z
points. The units of entry must be PSIA.
4-16
1010GCNFM-3C
3
) and compressibil-
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