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https://www.alphainstruments.com/low-differential-pressure-transducers-transmitters/

As a professional differential pressure transmitter manufacturer, Alpha instruments Inc was founded in 2005, in Massachusetts, US. We specialized in the development and manufacture of low differential pressure transducer, which were applied in HVAC, Critical Environments, Medical Industry, Semiconductor Equipment, etc.

The low differential pressure sensor is a typical sensor, which has certain applications in various industries. It is also a commonly used sensor. The following is an introduction to the working principle of the low differential pressure sensor.

The two pressures of the measured medium of the low differential pressure sensor enter into the high and low pressure chambers, and act on the isolation diaphragms on both sides of the δ element (that is the sensitive element). Then they are transmitted to the both sides of measuring diaphragms through the isolation diaphragms and the filling liquid in the elements. The electrodes on the measuring diaphragms and the isolation diaphragms on both sides constitute a capacitor respectively.

When the pressures on both sides are inconsistent, the measuring diaphragms will be displaced, and the displacement is proportional to the pressure difference, therefore, the capacitance on both sides is not equal, which is converted into a signal proportional to the pressure through the oscillation and demodulation link. The working principle of pressure transmitter and absolute pressure transmitter is the same as that of differential pressure sensor the difference is that the pressure in the low pressure chamber is atmospheric pressure or vacuum.