Siemens SITRANS LR250 (HART) Manual De Inicio Rápido página 27

Maximum Process Temperature Chart
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,
Non-incendive
Note: When using HART communications, the minimum voltage with 220 Ohms (RL) is
16.3 V DC.
A5E31997170
90
80
70
60
50 Threaded
PVDF
40
antenna
30
20
10
0
0 50 80
Process Temperature (
SITRANS LR250 (HART) – QUICK START MANUAL
Flanged Horn
encapsulated antenna
antenna
100 150 170 200
o
C)
Loop Voltage – V
L
250
ALLOWABLE
OPERATING AREA
Page EN-25