The last one is differential pressure
Steam Flow Meter, differential pressure signal + vortex flowmeter = differential pressure vortex mass flowmeter. The differential pressure signal is the pressure difference between the two pressure-taking holes at a specific position on the upstream and downstream of the generating body. The axis of the two taking pressure hole should be in the same plane as the axis of the generating body. Take the pressure hole distance on the size and stability of the differential pressure has a significant impact. Distance, differential pressure signal, but the stability is poor; distance, then the contrary. Through the test, select the appropriate pressure hole location is very important. This instrument is simpler and easier to implement than a lift vortex mass flow meter. Domestic manufacturers have been invested in the development and invention patents, products have been applied in some enterprises.
steam flow measurement :https://www.youtube.com/watch?v=T3LVdtTHnXw
Automatic Tank Gauges :http://www.kunlunsensors.com
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