Pressure Detectors PRESSURE DETECTORSPRESSURE DETECTORSMany processes are controlled by measuring pressure. This chapter describes thedetectors associated with measuring pressure.EO 1.1 EXPLAIN how a bellows-type pressure detectorproduces an output signal including:a. Method of detectionb. Method of signal generationEO 1.2 EXPLAIN how a bourdon tube-type pressure detectorproduces an output signal including:a. Method of detectionb. Method of signal generationBellows-TypeDetectorsThe need for a pressure sensing element that was extremely sensitive to low pressures andprovided power for activating recording and indicating mechanisms resulted in the developmentof the metallic bellows pressure sensing element. The metallic bellows is most accurate whenmeasuring pressures from 0.5 to 75 psig. However, when used in conjunction with a heavy rangespring, some bellows can be used to measure pressures of over 1000 psig. Figure 1 shows abasic metallic bellows pressure sensing element.Figure 1 Basic Metallic BellowsRev. 0 Page 1 IC-02
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