Thermal gas flow meter – I hope experts can help resolve my doubts
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The thermal gas flow meter showed a normal zero reading after the plant was shut down, but after a few days it started showing abnormal readings – there was a high flow rate even though none should be present. The sensor and other components have been cleaned thoroughly; could anyone help analyze what might be the cause?
Is water getting into the sensor? Stops will cause temperature changes, which may lead to the formation of condensate water and damage to the sensors
The sensor is used to measure temperature and flow rate; there should be no water ingress, and it’s now at almost full scale
When the valves on both sides are closed, it reaches zero; once the flow is restored, it reaches full scale. It is currently in a stopped state.
What brand is it? What is the measurement range? :o
Shanghai Anrui 0.06-0.5t/h
Is it inside the pipe, or has it entered the instrument?
Are you in the south or the north? Liquefied gas is highly susceptible to phase changes with pressure and temperature, and the measurement principle of thermal flow meters is related to the specific heat capacity of the medium; therefore, to prevent the liquefied gas from liquefying, the pipes need to be insulated and the pressure must meet the requirements for vaporization.
South, the standards you mentioned should be fine