Chemical Seal Pressure Gauges

Application : Chemical seals are process connections with a separating diaphragm which separate the measuring system and the medium to be measured. Chemical seals expand the application ranges of pressure gauges, pressure switches and pressure transducers.

Principle of operation : Chemical seals are used in conjunction with Bourdon tube pressure gauges, pressure trans­ ducers or pressure switches.They are either mounted directly to the measuring Instrument or connected via a cooling element or a capillary tube.The separating element - a diaphragm or a pipe is the main component of a chemical seal. The diaphragm seal is the most commonly used chemical seal. A chemical seal is always a sealed system; the space between the separating element and the measuring deviece (e.g.Bourdon transmission liquid.The medium to be measured is in contact with the separating element and causes it to bend.This,In turn,causes a change of the volume within the system. The element must have a displacement capacity which is sufficient to move the measuring element The deflection must always take place in the elastic area of the separating element This Is determined by the diameter,the material and the shape.

Temperature Performance : The system is filled at room temperature. Different performance temperatures will change the volume of the filling liquid.This would have a nagative Impact on the accuracy.If you specify the operating temperatures.we can counteract this effect by selecting the most suitable filling liquid.
If the temperature exceeds 100 0c, the geuge and the chemical seal at the measuring point should be separated by means of a capillary tube or the system should be equipped with acooling element.