Appendix J: Hazardous Area Installations; Wiring Details; Intrinsically Safe Model - Siemens Sitrans PROBE LU Instruction Manual

Appendix J: Hazardous area
installations
•

Wiring details

• Instructions specific to hazardous area installations
Wiring Details

Intrinsically Safe Model

FM/CSA: see
Intrinsically Safe wiring drawing (FM/CSA)
number 23650617)
Under the entity evaluation concept, SITRANS Probe LU has the following
characteristics:
(input voltage) U
(input current) I
i
(input power) Pi
(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.
Under the FISCO evaluation concept, SITRANS Probe LU has the following
characteristics:
(input voltage) U
(input current) I
i
(input power) P
i
(internal capacitance) Ci
(internal inductance) Li
7ML19985JB02 SITRANS Probe LU (PROFIBUS PA) – INSTRUCTION MANUAL
= 24 V DC (max.)
i
= 250 mA DC (max.)
= 1.2 W
= 0.5 nF
= 0
) levels which can be delivered by the associated apparatus,
o
= 17.5 V
i
= 380 mA
= 5.32 W
= 0.5 nF
= 0
on page 107
for reference drawing
Page 103