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Appendix A: Technical reference
A.4 Process Pressure/Temperature derating curves
SITRANS LR250 with FOUNDATION FIELDBUS
242
Operating Instructions, 09/2021, A5E32221411-AH
Maximum Process Temperatures versus allowable ambient
① Internal enclosure temperature
② Ambient temperature
③ 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
Minimum Value (3.3.1.) and Maximum Value (3.3.2.) to monitor the Internal
Temperature.
A.4 Process Pressure/Temperature derating curves
WARNING
Exceeded maximum permissible operating pressure
Danger of injury or poisoning.
The maximum permissible operating pressure depends on the device version. The device
can be damaged if the operating pressure is exceeded. Hot, toxic and corrosive process
media could be released.
•
Make sure that the device is suitable for the maximum permissible operating pressure of
your system.
DANGER
Pressure applications
Danger to personnel, system and environment will result from improper disassembly.
•
Never attempt to loosen, remove, or disassemble process connection while vessel
contents are under pressure.