Is it appropriate to use a differential pressure gauge or two separate pressure gauges for differential pressure measurement?
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Measure the pressure drop at the inlet and outlet of the product. My understanding is that for gases, where the pressure drop is relatively small – a few hundred Pa – a differential pressure transmitter is used; whereas for liquids, where the pressure drop is larger, a pressure transmitter is employed by subtracting the values at the inlet and outlet. After all, the difference between the two pressure readings provides more meaningful information than a single differential pressure reading. Do everyone agree?
The clocks of the two pressure transmitters are not synchronized, resulting in inaccurate differences! The resulting trend is a curve.
First, it is necessary to clarify the purpose of differential pressure measurement. Second, determine the accuracy requirements for such measurements based on that purpose. Finally, based on the accuracy requirements and budget, decide whether to use a differential pressure gauge or simply subtract the pressure values before and after. If the budget permits, measure both the pressure difference and the pressures at the front and back^_^
First, it is necessary to determine the purpose of measuring the pressure difference. If the goal is simply to control the pressure difference without considering the absolute pressure, then a differential pressure gauge will suffice. If it is necessary to know not only the pressure difference but also the pressure values at the inlet and outlet, then pressure gauges should be installed at both locations, after which the pressure difference can be measured.