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Instrumentation and Control Volume 1 of 2 | Next
INSTRUMENTATION AND CONTROL Module 3 Level Detectors |
Pressure Detectors
PRESSURE DETECTION CIRCUITRY
Summary
The operation of a strain guage and a typical pressure detection device is summarized below.
Circuit Operation Summary
The operation of a strain gauge is as follows:
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A strain gauge measures the pressure applied to a fine wire. The
fine wire is usually arranged in the form of a grid. The pressure
change causes a resistance change due to the distortion of the
wire.
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This change in resistance is used as the variable resistance in a
bridge circuit that provides an electrical signal for indication of
pressure.
The operation of a typical pressure detection device is as follows:
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The detector senses the pressure of the monitored system and
converts this pressure to a mechanical signal. The mechanical
signal from the detector is supplied to the transducer.
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The transducer will convert this signal to a usable electrical signal
and send a signal proportional to the detected pressure to the
detection circuitry.
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The detector circuitry will amplify and/or transmit this signal to
the pressure indicator.
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The pressure indicator will provide remote indication of the
system pressure being measured.
Rev. 0
Page 13
IC-02
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