Siemens sitrans PROBE LU User Manual

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

Siemens sitrans PROBE LU Specifications

General

Measuring Principle	Ultrasonic
Communication	HART
Output	4 to 20 mA
Power Supply	12 to 30 V DC
Process Temperature	-40 to 80 °C
Enclosure Rating	IP68
Material	PVDF
Ambient Temperature	-40 to 70 °C
Measurement Range	0.25 to 12 m (0.8 to 39 ft)