The oil level in the lubricating oil tank of the pump is measured using a differential pressure gauge
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The positive pressure side is connected to the lower part of the oil tank. Is the negative pressure side in the gas phase or the liquid phase? In other words, should there be liquid or gas in the conduit on the negative pressure side?
In the case of a pressure vessel at atmospheric pressure, negative pressure affects the atmosphere; in a pressure vessel under pressure, negative pressure affects the gas phase