Chemical Seals - Introduction

It is used to measure the pressure of liquids and gases if it is not possible for the measured medium to penetrate into the gauge or transmitter measuring device.

This need arises where they occur:

Highly viscous liquids
Solid particulate fluids, sedimentary sludge
Hot liquids that solidify or crystallize when the temperature drops
Aggressive fluids
Requirements for perfect system cleanup

The solution consists in using a separating membrane and an inert liquid, that transfers pressure to the gauge or transducer measuring device.

We produce and repair many types of separators, different types of flanges and dimensions.

Gallery of chemical seals applications ...

Selection of membrane size

Small measuring range, greater operating temperature differences, higher accuracy requirements, longer capillary length, low damping requirement - all these are factors that lead to a larger diaphragm demand.

Filling the separators with the working fluid

The filling is carried out in a vacuum because the filled compartment has to be completely degassed. Similarly, the working fluid must be free of dissolved gases before filling. With regard to the conditions in which the system is to operate, we use the following working fluids:

Silicone oil for standard applications at temperatures -20 až +200°C;
High temperature oil KN3.2 (WIKA) for temperatures up to 400°C;
Halocarbon oil for applications on oxygen or chlorine-containing equipment;
Low viscosity silicone oil for temperatures between -90 and +100°C;
Synthetic oil NEOBEE with food safety certificate according to USDA.

Ordering information

The accurate and reliable function of the diaphragm separator system depends primarily on the choice of the type of separator and its size.It is also important to set the initial parameters, including adjusting the stiffness of the diaphragm and determining the optimum amount of working fluid. In the order it is advisable to specify the following parameters:Type and size of the required separator; Range of measured pressure and required measurement accuracy; The temperature of the measured substance (permanently, short-term in measurement, short-term without measurement); Ambient temperature; Working position (horizontal, vertical, oblique, top / bottom diaphragm axis); Type of liquid to be measured, resp. With any warning about its aggressive effects; The type of barometer or converter to be used with the separator, including the specification of its attachment dimension.