How Does a Gauge Get Mounted to a Diaphragm Seal?

Explanation of how a pressure gauge and diaphragm seal assembly work. Visit winters.com/ for more information on our gauges and instrumentation.

[@helicrashpro]

What about damaging the diaphragm from pulling a vacuum? It that not a concern? Atmospheric pressure must not be enough to damage the diaphragm?

[@WintersInstruments]

There are two techniques for filling a seal. 1) Pulling a vacuum from the fill port. As the concern expressed in the question, if the diaphragm is real thin as different manufactures have slightly different thicknesses in the diaphragms they use, the diaphragm can be sucked up and possibly damaged depending on the design of the seal itself. To prevent this a vacuum can be pulled on the process side of the seal to prevent it from being sucked up. 2) Some seals can be filled by what is called gravity feed. The fill fluid is basically put in by hand and let to sit. Then the diaphragm is burped by pressing slightly on the bottom of the seal. This process is repeated until no more bubble come out meaning all the trapped air has been removed. The instrument is filled separately and mounted to the top of the seal. If pressure builds up on the assembly from overfill, then use the bleed screw to zero the assembly out.