A diaphragm seal is a flexible membrane that seals and isolates an enclosure. The flexible nature of this seal allows
pressure effects to cross the barrier but not the material being contained. Common uses for diaphragm seals are to protect
pressure sensors from the process fluid whose pressure is being measured. A Diaphragm seal can be mounted to almost all
pressure instruments. They are mostly used in combination with pressure (gauge or differential) transmitters, but also in
combination with pressure gauges and pressure switches.

 

• Protect the Instrument and Process Medium 

• Corrosive 

• Viscous or contains solid particles 

• Extremely hot 

• Sterile (Important to eliminate formation of bacteria)

​

Diaphragm Seal Integration with Pressure Instruments (Fit & Fill Service)

 

A diaphragm seal can be mounted to nearly all pressure instruments, and is primarily used in conjunction with
pressure transmitters—both differential and gauge types. They are also compatible with pressure gauges and

pressure switches. The use of diaphragm seals is recommended when the process medium is:

​

• Corrosive

• Extremely high or low temperature

• Viscous or contains solid particles

• Sterile (important for eliminating bacterial growth)
   

Diaphragm seals can also be used when in the process where there are chances of H+ ions being present, that can permeate

the diaphragm. In these cases, a diaphragm seal with GOLD PLATING is provided to protect the transmitter from Hydrogen 

permeation. 

 

The pressure instrument is direct mounted or through a capillary line to the diaphragm seal. The complete volume of the diaphragm
seal, the capillary and the measuring system, is filled under high vacuum with the appropriate fill fluid. The seals are filled with fluids,
such as silicone based, inert and FDA approved oils (for hygienic seals). Filling fluids that we use can withstand various temperature
ranges between -105 ºC up to 410 ºC. The mounting and filling is done professionally according to stringent International standards
and procedures.
 

We have our own calibration test systems / equipment in place to attain a high accuracy and communication
protocols are readily available – HART, FOUNDATION FIELDBUS, D/E, etc.