Selection of local level gauges
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Operating temperature: -50°C. It is necessary to measure the gas-liquid interface; the medium is corrosive, and the pipes in use on site are steel-lined PTFE pipes. What types of level gauges can be used in this situation?
Can the local instrument do it? Is that magnetic flap with 304 lining and PTFE suitable?
For a float level gauge, stainless steel will do
A magnetic flap lined with PTFE should work fine
Yes, the magnetic flap gauge cylinder is lined with PTFE, and the float is also made of PTFE
Close your eyes, shut off your brain; pick randomly and justify it however you can. If it works, use it; if not, discard it and pick another one, changing it over and over, forever. :P
I also consulted some instrument manufacturers, and they were reluctant to take on the task; the main issue is the low temperature of -50°C, as this may cause the lining layer to shrink