Pressure Detectors PRESSURE DETECTORSSummaryThe operation of bellows-type and bourdon tube-type pressure detectors is summarized below.Bellows and Bourdon Tube Pressure Detectors SummaryIn a bellows-type detector:- System pressure is applied to the internal volume of a bellows andmechanical linkage assembly.- As pressure changes, the bellows and linkage assembly move tocause an electrical signal to be produced or to cause a gaugepointer to move.In a bourdon tube-type detector:- System pressure is applied to the inside of a slightly flattened arc-shaped tube. As pressure increases, the tube tends to restore to itsoriginal round cross-section. This change in cross-section causesthe tube to straighten.- Since the tube is permanently fastened at one end, the tip of thetube traces a curve that is the result of the change in angularposition with respect to the center. The tip movement can thenbe used to position a pointer or to develop an electrical signal.Rev. 0 Page 3 IC-02
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