Pressure DetectorsPRESSURE DETECTION CIRCUITRYSummaryThe operation of a strain guage and a typical pressure detection device is summarized below.Circuit Operation SummaryThe operation of a strain gauge is as follows:- A strain gauge measures the pressure applied to a fine wire. Thefine wire is usually arranged in the form of a grid. The pressurechange causes a resistance change due to the distortion of thewire.- This change in resistance is used as the variable resistance in abridge circuit that provides an electrical signal for indication ofpressure.The operation of a typical pressure detection device is as follows:- The detector senses the pressure of the monitored system andconverts this pressure to a mechanical signal. The mechanicalsignal from the detector is supplied to the transducer.- The transducer will convert this signal to a usable electrical signaland send a signal proportional to the detected pressure to thedetection circuitry.- The detector circuitry will amplify and/or transmit this signal tothe pressure indicator.- The pressure indicator will provide remote indication of thesystem pressure being measured.Rev. 0 Page 13 IC-02
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