Appendix A: Technical reference
A.4 Maximum Process Temperature Chart
SITRANS LR250 with mA/HART
244 Operating Instructions, 10/2019, A5E32220602-AG
A.4 Maximum Process Temperature Chart
Exceeded maximum internal and process temperatures
Danger of device malfunction
• Internal temperature must not exceed +80 ° C (+176 °F).
• Process temperature must not exceed limits specified by the antenna type.
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 sunlight exposure.
Maximum Process Temperatures versus allowable ambient
Internal enclosure temperature
Process temperature (at process connec-
tion)
Where the chart does not apply, please use your own judgement regarding the use of
SITRANS LR250.
If the internal temperature exceeds the maximum allowable limit, a sun shield or a longer
nozzle may be required.
See Current Internal Temperature (3.2.1.) to monitor the Internal Temperature.
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