Sanitary Diaphragm Seal

Model 8212
With union nut

Availability: Upon Request - OEM Orders

The production process of Items marked as "Upon Request..." starts after receiving the order and usually needs 3 weeks or more.

Seal-Mate group of diaphragm seals come between the pressure measuring instrument and some medias which can damage the instrument or be harmful if they get directly in touch with the instrument. In many industrial processes, it happens a lot that the media cannot or should not get into direct contact with the instrument. Sometimes that is for the sake of keeping the instrument work properly as the media is too viscous and might easily clog the process connections, and sometimes it is for hygienic purposes.

The flexible metal diaphragm of InstruMate seals is made of SS316L by default and the space between this flexible diaphragm and the instrument process connection is filled with a filling fluid, chosen in best interest of where the instrument is going to be installed. So the intended pressure is transmitted via the flexible diaphragm to the filling fluid and then via the filling fluid to the pressure instrument.

InstruMate diaphragm seals are vacuum protected and also not sensitive to sudden sharp increase in pressure.

InstruMate sanitary diaphragm seal Model 8212 is specially designed to endure high steam temperatures for sterilization of the process connection. InstruMate 8212 joins with pipe connection via a union nut available is all standard sizes. If hygienic feature is going to be maintained in food or pharmaceutical industry, then InstruMate 8212 is a great choice because of its fast and easy removal from the plant.

This sanitary diaphragm seal with grooved union nut is easy for handling COP service(cleaning out of place).


  • Food, beverage, and brewery industries
  • Milk and dairy industry
  • Drink & beverage filling machines

Special Features

  • Excellent for frequent cleaning
  • Suitable for COP (cleaning out of place)


Diaphragm: Standard version: SS316L
Option: Hastelloy C276
Body of the Diaphragm
Standard version: SS316L
Option: SS316L
Nut: Standard version: SS304
Option: SS304
Maximum Permissible Process Temperature in °C: Standard version: Option: 400 400
Female Instrument Connection: Standard version: Option: ½ NPT  ¼ NPT, ½ BSP, ¼ BSP, M20x1.5, M12x1.5
Threaded Pipe Connection Per: * DIN 11851 * SMS 1145 * IDF standard (ISO/DIS 2853 and BS 4825 part 4) * APV-RJT standard (BS 4825 part 5)
Pipes Per: * DIN 11850 row 2 * ISO 1127 row 2 or ISO 2037/1992 * BS 4825 part 1 or O.D. tube


Data sheets

Diaphragm seal with sterile connection model 8212
  • EN

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