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Appendix G: hazardous area
installations
•
Wiring details
•
Instructions specific to hazardous area installations
Wiring Details
Intrinsically Safe Model
FM
(reference drawing 23651611)
CSA
(reference drawing 23651621)
Under the entity evaluation concept, SITRANS Probe LR has the following
characteristics:
(input voltage) U
i
(input current) I
i
(internal capacitance) Ci
(internal inductance) Li
Definition:
The Entity Concept allows interconnection of intrinsically safe apparatus to associated
apparatus not specifically examined in such combination. The criteria for interconnection
is that the voltage and current which intrinsically safe apparatus can receive and remain
intrinsically safe, considering faults, must be equal to or greater than the output voltage
(U
) and output current (I
o
considering faults and applicable factors. In addition, the maximum unprotected
capacitance (Ci) and Inductance (Li) of the intrinsically safe apparatus, including
interconnecting wiring, must be equal to or less than the capacitance and inductance
which can be safely connected to associated apparatus.
Page 100
SITRANS Probe LR – INSTRUCTION MANUAL
= 30 V DC (max.)
= 120 mA DC (max.)
= 3.6 nF
= 0. 1 mH
) levels which can be delivered by the associated apparatus,
o
7ML19985HR02
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