The barrel of the gauge body houses a magnetic piston and range spring in the piston gauge. The piston in the bore is forced against the range spring by the difference in pressure between the high and low ports. Reed switches, transmitters, and signalling pointers can all be moved by the magnetic piston.
Some of the leading laboratories in the world get their primary pressure readings at reference levels from precision Mass piston gauges. Models with complete automation are available in our selection of piston gauges. With very little uncertainty, generated pressure is determined by our primary level pressure balances using a fundamental equation. Wide pressure ranges are covered by the PG piston gauges, which also offer complete automation and have an easier to use interface. They are the mainstay of any high level pressure calibration facility.