Page EN-20 SITRANS LR250 (HART) – QUICK START MANUAL 7ML19985QX81
mmmmm
English
Maximum Process Temperature Chart
.
Parameter 3.14.1 is required to monitor the Internal Temperature. It gives you an excellent
indication of how reliably the product will perform thermally when installed on your process
vessel.
Loop power
Typical Connection Drawing
WARNING: Internal temperature must not exceed 80 °C (176 °F).
Notes:
• The chart below is for guidance only:
• The chart does not represent every possible process connection arrangement. For
example, it will NOT apply if you are mounting SITRANS LR250 directly on a metallic
vessel surface.
• The chart does not take into consideration heating from direct sunshine exposure
Note: Loop voltage is the voltage at the terminals of the power supply (not the voltage at the
terminals of the device).
0
10
20
30
40
50
60
70
80
90
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
flange
tempera-
ture
process
temperature
Ambient Temperature (
o
C)
Process Flange Surface Temperature (
o
C)
Maximum Flange and Process Temperatures versus allowable ambient for
flange adapter versions of SITRANS LR250
+
-
LR250
loop resistance
RL
loop current IL
loop voltage
VL
power
supply
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