Bailey & Mackey’s range of Diaphragm Pressure Gauges is built to the highest standards of workmanship required for such precision instruments. Each individual Pressure Gauge is subject to a series of stringent pressure and calibration tests before despatch.



A diaphragm is a more mechanically stable element than a bourdon tube and can stand mechanical shock with less damage. Diaphragm Pressure Gauges can be used to indicate pressures below those practical for bourdon tube pressure gauges.

Liquids and gases

The diaphragm can be protected against aggressive liquids and gasses by fitting a thin flexible disc of resistant material as a barrier between it and the corrosive media. The pressure chamber or base can be made from a suitable material. A Diaphragm Gauge is technically preferable to using a Bourdon Tube Pressure Gauge fitted to a chemical seal.

Viscous liquids and powders

They can be used on viscous liquids, powders, and slurries, with the connection having a large entry passage or the diaphragm can be fitted directly onto pipe flanges or hygienic fittings.

Operating conditions

Diaphragm Gauges can be adapted to meet stringent operating conditions for example, they can be fitted with overload protection, they can have pulsation dampers fitted above the working diaphragm.


There is a choice of low pressure gauges - types 65,66, 67 and 68 - and high pressure units - types 70, 70A and 70B, Brief details on these can be seen by selecting a version from the sidebar menu.

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