Siemens SITRANS LR250 Guide De Mise En Service Rapide page 25

Maximum Process Temperature Chart
Flange Adapter versions of LR250
WARNING: Internal temperature must not exceed 80 °C (176 °F).
Notes:
• The chart is for guidance only and does not represent every possible process connection
arrangement. (It will NOT apply if SITRANS LR250 is mounted directly on a metallic vessel
surface.)
• The chart does not take into consideration heating from direct sunshine exposure.
• Parameter 3.2. 1 Current Internal Temperature monitors the internal temperature.
Maximum Process
Temperatures versus
allowable ambient
Loop power
Power Supply Requirements
Note: The curves below apply to a standalone device, configured via the Siemens handheld
programmer.
Curve 1: General
Purpose, Intrinsically
Safe, Non-Sparking/
Energy Limited/ Non-
incendive
Note: When using HART communications, the minimum voltage with 220 Ohms (RL) is 16.3
VDC.
A5E31997170 SITRANS LR250 (HART) – QUICK START MANUAL
process
temperature
ALLOWABLE
OPERATING AREA
Loop Voltage – V
L
Process
o
Temperature ( C)
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