The diaphgram seals are used to protect the pressure gauges from crystallizing, aggressive, toxic, harmful, viscous, adhesive and dangerous fluids for environment and people.
They are composed by a welded membrane which is realised with suitable materials according to the fluids to be measured, so they satisfy even the most stringent measurement and safety requirements.
Thanks to a very wide choice of transmission fluids that hydraulically trasmit the membrane pressure to the measuring instrument, the separator has unlimited applications also because of the innumerable types of process connections and construction materials.
Among these applications we can find:
When the instrument is subjected to fluctuations in the ambient or process temperature, variations in the volume of the filling liquid are generated which are absorbed by the elastic parts of the instrument itself.
A part of these variations is absorbed by the diaphram seal while the remaining one is absorbed by the sensitive element of the measuring instrument. This last one gives an error in the indication of the measured pressure.
To contain this error as much as possible it is necessary: