A device that measures the pressure exerted by a fluid relative to a perfect vacuum; used to measure pressures very close to a perfect vacuum.



Related Terms

ANEROID LIQUID-LEVEL METER

A mechanism to measure fluid depth by pressure of the fluid against a bellows which in turn acts on a manometer or signal transmitter.

KNUDSEN VACUUM GAGE

Device to measure negative gas pressures; a rotatable vane is moved by the pressure of heated molecules, proportionately to the concentration of molecules in the system.

VALVE

A device which controls fluid flow direction, pressure, or flow rate.

ANEROID FLOWMETER

A mechanism to measure fluid flow rate by pressure of the fluid against a bellows counterbalanced by a calibrated spring.

GAS THERMOMETER

A device to measure temperature by measuring the pressure exerted by a definite amount of gas enclosed in a constant volume; the gas (preferably hydrogen or helium) is enclosed in a glass or fused-quartz bulb connected to a mercury manometer. Also known as constant-volume gas thermometer.

HYHYDRAULIC NOZZLE

An atomizing device in which fluid pressure is converted into fluid velocity.

COMPRESSIBILITY

Measure of ability of being compressed. The change in volume of a unit volume of a fluid when subjected to a unit change of pressure.

INTENSIFIER

A device which converts low pressure fluid power into higher pressure fluid power.

BULB

The name given to the temperature-sensing device located in the fluid for which control or indication is provided. The bulb may be liquidfilled, gas filled, or gas-and-liquid filled. Changes in temperature produce pressure changes within the bulb which are transmitted to the controller.

ZERO GOVERNOR

A regulating device that is normally adjusted to deliver gas at atmospheric pressure within its flow rating.

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