Siemens Sitrans LR250 Instruction Manual page 27

• For wiring requirements: follow local regulations.
• Approved dust-tight and water-tight conduit seals are required for outdoor
NEMA 4X / type 4X / NEMA 6, IP67, IP68 locations.
Instructions specific to hazardous area installations
• Refer to
Under the entity evaluation concept, SITRANS LR250 has the following characteristics:
(input voltage) U
(input current) I
i
(input power) P
i
(internal capacitance) Ci
(internal inductance) Li
Entity Concept:
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
(Uo) and output current (Io) 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.
FISCO Concept
Under the FISCO evaluation concept, SITRANS LR250 has the following characteristics:
(input voltage) U
(input current) I
i
(input power) P
i
(internal capacitance) Ci
(internal inductance) Li
Note: For complete details and instructions regarding the FISCO Concept The FM/CSA
connection drawing number 23650675 can be downloaded from the product page of our
website at: www.siemens.com/LR250.
7ML19985JF02 SITRANS LR250 (PROFIBUS PA) – INSTRUCTION MANUAL
= 24 V
i
= 250 mA
= 1.2 W
= 0
= 0
= 17.5 V
i
= 380 mA
= 5.32 W
= 0
= 0
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