Differential Pressure Transmitter

A differential pressure transmitter measures the pressure difference between a high-pressure side and a low-pressure side. The two process pressures act on isolating diaphragms and are transferred through fill fluid to the sensing element. In SUPMEA transmitters such as the SUP-2051, a monocrystalline silicon sensor detects the differential pressure and converts it into an electrical signal. The electronics condition the signal and provide a proportional 4–20 mA output, with HART on selected models. 

Differential pressure can be used directly to monitor pressure drop across filters or equipment, or combined with a primary flow element to calculate flow rate. With the correct installation arrangement and fluid density data, it can also be used for liquid-level measurement in process vessels.