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A Diaphragm seals main purpose is to protect the instrument. Fitting a diaphragm seal to a pressure instrument is recommended where the process medium is highly viscous or contains suspended solids, high temperatures or corrosive. Diaphragm seals are normally connected directly to the instrument but connection may be made by a flexible capillary, which makes them ideal for remote pressure indication. Pressure is transmitted from the diaphragm seal to the instrument's sensing element by a suitable fill fluid.
We produce a comprehensive range of diaphragm seals to suit hygienic and chemical applications
The correct fill fluid will ensure compatibility with the process and process temperature. Our selection of fill fluids allows us to cover a variety of pressures and temperatures applications from -80ºC to +399ºC.
Most fill fluids contain microscopic amounts of air and trapped gases which expand with rising temperatures. This expansion within the fill fluid can cause the instrument to indicate a false pressure reading. For this reason we have invested heavily in our turbo molecular vacuum filling station to extract these trapped gases from the fill fluid before we release them into the instrument. Our vacuum filling station can achieve pressures as low as 10x-9 mbar absolute (0.000000001) this ensures our diaphragm seal systems are as temperature stable as we can physically make them.
All our diaphragm seals are helium leak tested to ensure there are no microscopic holes that could lead to instrument failure or a fill fluid leak contamination into your process system.
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