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An aneroid pressure gauge or manometer is used to measure relatively low pressure differences from atmospheric pressure. It consists of a metal (usually copper) cylinder with thin corrugated sides often seen in barometers. The cylinder contains air and is completely sealed so that changes in the external pressure cause it to become longer or shorter. One end of the cylinder is fixed, while the other connects to a rack and pinion, with a pointer attached to the pinion. The pointer thus moves over a scale indicating pressure. The system can also be used in reverse so that the pressure to be measured is fed to the inside of the cylinder. There will however be a small error due to changes in atmospheric pressure.
Content and Design Copyright 2000 Dr. Malcolm C Brown. See Title Page for more details