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The fluid in the pipeline is C4, that is, liquefied gas. When using a differential pressure gauge to measure flow rate, is it better to fill the gauge’s pressure lead pipes with an isolating fluid, or to direct the fluid directly to the gauge itself?
Directly lead to the table header: Liquefied gas tends to vaporize in summer, and it’s also impossible to obtain accurate readings when there is gas present in the liquid
There is no need for a isolation fluid; a pressure lead can be used directly. For gases, the pressure tapping port of the pressure guide tube should face upward, with the transmitter installed above the pressure tapping point; the same applies in reverse for liquids. Even changes in physical state will not affect the measurement (but moisture presence must be taken into account, and wastewater should be drained regularly if necessary).
Generally, no filling is needed to stabilize pressure; if the pressure fluctuates greatly, filling is advisable