Force Gauges with Solid Sensing Elements

Authored by: Igor Bello

Vacuum and Ultravacuum

Print publication date:  November  2017
Online publication date:  November  2017

Print ISBN: 9781498782043
eBook ISBN: 9781315155364
Adobe ISBN:


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Piston vacuum gauges are mechanical devices that measure pressure directly. The pressure is determined by the measurement of a force effect exerted by a gas on a freely floating piston. This mechanism has been used for many years, and devices based on this operational principle are commercially available. First, these devices were used for the measurement of small pressure differences at an absolute pressure of 10 MPa and in a very narrow region of low vacuum (2.1 × 103 − 1.1 × 104 Pa, and 104 − 1.1 × 105 Pa). Because of the direct pressure measurement and metrological interest, a number of studies on these gauges have been published. Ernsberger and Pitman 735 describe a vacuum gauge for low pressure measurements (6.65 × 10−2 to 2.66 Pa) using a freely suspended piston in a cylinder to measure the vapor pressure against a referenced low pressure on the other side of the piston, with reported accuracy better than 1%.

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