Instrument interlock
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What is the principle behind the interlocked testing of the level gauge and the two presses?
To be honest, the problem itself is quite amateurish
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It is probably by measuring the corresponding liquid level through two pressure differences. There are currently cases of using differential pressure gauges to measure liquid levels. You can consult the relevant manufacturers.
Look at the control logic; once you understand the logic, you’ll grasp the principle behind it