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Figure 10 shows a block diagram of a typical pressure detection circuit.
Figure 10 Typical Pressure Detection Block Diagram The sensing element senses the pressure of the monitored system and converts the pressure to a mechanical signal. The sensing element supplies the mechanical signal to a transducer, as discussed above. The transducer converts the mechanical signal to an electrical signal that is proportional to system pressure. If the mechanical signal from the sensing element is used directly, a transducer is not required and therefore not used. The detector circuitry will amplify and/or transmit this signal to the pressure indicator. The electrical signal generated by the detection circuitry is proportional to system pressure. The exact operation of detector circuitry depends upon the type of transducer used. The pressure indicator provides remote indication of the system pressure being measured. Summary The operation of a strain guage and a typical pressure detection device is summarized below. The operation of a strain gauge is as follows: 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. 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: 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. The transducer will convert this signal to a usable electrical signal and send a signal proportional to the detected pressure to the detection circuitry. The detector circuitry will amplify and/or transmit this signal to the pressure indicator. The pressure indicator will provide remote indication of the system pressure being measured.
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