Regarding the current issue of differential pressure transmitters
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I encountered such a problem today； A differential pressure transmitter with a range of -50 to 50 KPa is installed at two pressure measurement points, one at the top and one at the bottom of a silo. However, after the explosion-proof diaphragm ruptured, its display showed -0.4 mbar; this was measured using the galvanometer on an ammeter. The current is 3.96 mA, while the current measured with the ammeter connected in series is 12.5 mA. I think this is correct, but why is there such a large difference between them? I would appreciate some guidance from an expert.
Connecting the ammeter in series is correct; the galvanometer you mentioned has a very low internal resistance, so it must be connected in series for measurement.
What does an explosion-proof film mean? ? ? ? However, I can suggest that you replace the transmitter; there is a component behind it that is used to convert signals, and it’s likely that this component is damaged! ! You can remove one from another normal transmitter and install it in place to give it a try! ! Hehe! !