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- Dec 03, 2018 -

Bellows are tubular elastic sensing elements connected along the direction of folding and expansion by foldable corrugated sheets. Bellows are widely used in instruments and meters. They are mainly used as measuring elements of pressure measuring instruments to convert pressure into displacement or force. The corrugated tube wall is thin and sensitive, and the measuring range is from tens of pa to tens of mpa. Its opening end is fixed, the sealing end is in a free state, and an auxiliary helical spring or spring is used to increase the elasticity. Under the action of internal pressure, the movable end is elongated along the length of the pipe to produce a displacement related to the pressure. The active end drives the pointer to directly indicate the pressure. Bellows are often combined with displacement sensors to form a pressure sensor with a power output and are sometimes used as isolation elements. Because the expansion of bellows requires a large volume change, its response speed is lower than that of bourdon tubes. Bellows are suitable for low pressure measurement.