Your pressure instruments are a major investment and you need to make sure they aren’t damaged by process media. The solution for this is the use of diaphragm seals, to protect your system from high temperatures and corrosive, toxic, and viscous process fluids, as well as fluids that solidify at low temperatures. Diaphragm seals create a barrier between the process media and the pressure sensing element, without compromising the instrument’s sensitivity or accuracy.

Made from a thin pressure-sensitive film comprised of either plastic or metal, diaphragm seals are typically threaded onto pressure gauges. The air between the diaphragm seal and the pressure sensing element is then vacuumed out and replaced with a non-compressible fluid. The process media presses on the seal, flexing it and pushing on the non-compressible fluid, in turn flexing the pressure sensing element. Subsequently, the diameter of the diaphragm seal dictates the pressure at which the seal reads accurately.