This design utilises mechanical linkage between the diaphragm and movement.

The diaphragm and chamber can be made from or protected with chemical resistant materials. Flanged connections can be readily fitted, and the gauge can be liquid filled during manufacture to protect from vibration.
This gauge is especially suitable for low pressure operation of contacts. Dial sizes 100, 160 or 250mm, 304 St/St case, direct or surface mounting. Pressure ranges from 25 mbar vacuum to 30 bar. Accuracy ±1.6.