By Instrumentation and Control
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Extra resources for US DOE Handbook
Sample text
0 Strain Gauge Pressure Transducer Page 7 IC-02 PRESSURE DETECTION CIRCUITRY Pressure Detectors An increase in pressure at the inlet of the bellows causes the bellows to expand. The expansion of the bellows moves a flexible beam to which a strain gauge has been attached. The movement of the beam causes the resistance of the strain gauge to change. The temperature compensating gauge compensates for the heat produced by current flowing through the fine wire of the strain gauge. Strain gauges, which are nothing more than resistors, are used with bridge circuits as shown in Figure 5.
Magnetic Bond Method . . . . . Conductivity Probe Method . . . Differential Pressure Level Detectors Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
For increased sensitivity, the coil can be separated into two coils by utilizing a center tap, as shown in Figure 7. As the core moves within the coils, the inductance of one coil will increase, while the other will decrease. Rev. 0 Figure 7 Inductance-Type Pressure Transducer Coil Page 9 IC-02 PRESSURE DETECTION CIRCUITRY Pressure Detectors Another type of inductance transducer, illustrated in Figure 8, utilizes two coils wound on a single tube and is commonly referred to as a Differential Transformer.