Industrial Process Control | Pressure Transmitters

Industrial Process Control

>> Pressure Transmitters |  Differential Pressure Transmitters

What is a Differential Pressure Transmitters? A sensor to detect and measure process pressure.

The differential pressure transmitters is a sensing element connected by pipe work and flexes in proportion to the pressure. The resulting distortion produces an electric signal that is amplified and converted to a value on a read-out. The process side of the sensor sees the pressure to be measured while the other side is connected to a reference pressure. The reference pressure can be full vacuum, atmospheric pressure or another process pressure. Also  by connecting the differential pressure transmitters across an orifice plate in a pipeline, the pressure difference across the orifice can be put into a formula to calculate flow.

To prevent chemicals from damaging the differential pressure transmitters, a flexible diaphragm made of  materials that protects against pitting and stress corrosion cracking is used. Temperature may also need considered when working with differential pressure transmitters as outside temperature can cause the oil fill expands or contracts giving the sensor distorted and false pressure reading. Of course the sensing diaphragm on which the liquid pressure acts must be kept clean too.

For more about industrial process control sensors, see Instrumentation and Process Control Training article.

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