Figure 4 Strain Gauge Pressure Transducer

Figure 5 Strain Gauge Used in a Bridge Circuit

Instrumentation and Control Volume 1 of 2
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Pressure Detectors PRESSURE DETECTION CIRCUITRY Figure 3 Strain Gauge As the wire grid is distorted by elastic deformation, its length is increased, and its cross-sectional area decreases. These changes cause an increase in the resistance of the wire of the strain gauge. This change in resistance is used as the variable resistance in a bridge circuit that provides an electrical signal for indication of pressure. Figure 4 illustrates a strain gauge pressure transducer. Figure 4 Strain Gauge Pressure Transducer Rev. 0 Page 7 IC-02

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