A diaphragm seal pressure transmitter is a device used to measure pressure. It incorporates a diaphragm seal, a barrier between process fluid and the measuring instrument and a pressure transmitter that converts pressure into an electrical signal. Its primary role is to protect sensitive equipment from harsh process fluids, ensuring accurate readings without direct contact.

A diaphragm seal makes measuring pressure safer and more reliable – even in extreme working conditions – and is ideal for protecting pressure instrumentation and process transmitters. Discover the basic principle behind diaphragm seals and when to use them.

It often isn’t a problem when the process medium comes into direct contact with pressure gauges, pressure transmitters, or other pressure instruments. However, harsh media and environments can damage a sensor’s internal pressurized parts. In these instances, a diaphragm seal can make all the difference between reliable and unreliable readings.

The purpose of a diaphragm seal is to isolate a pressure measuring instrument from the process media. It is often used for the most difficult measuring tasks, such as when the environment is extremely hot or cold, or when a process connection is difficult to attach to the measuring instrument. Diaphragm seals are also used when the media being measured is corrosive, viscous, sticky, or easily solidified, or when the process isn’t chemically compatible with the instrument material.
Diaphragm seals are used to prevent process medium from entering directly into the pressure-sensing assembly of the Differential, Gauge or Absolute pressure transmitter.

Application which is suitable for diaphragm seal system...
For measuring the liquid level, density, flow and pressure of ;

high/low temperature fluids
highly corrosive/high viscosity fluids
the fluids which may cause clogging of impulse piping in the low temperature
toxic fluids
the fluids containing suspended solids which are deposited in the impulse piping and may cause clogging.