This type of sensor includes an electronic oscillator circuit that oscillates a wire at its normal frequency. The vibrating wire is placed in an aperture. When the pressure on the diaphragm changes, it is transmitted as tension to the wire, and as a result, the frequency of the wire vibration changes. This frequency change is a direct result of the pressure change.
The vibration frequency of the wire can be measured by digital pulses, and an electronic transmitter will convert these pulses into a suitable electrical signal for transmission.
This type of measurement can be used for differential, absolute and gauge pressures. The absolute pressure measurement is obtained by vacuuming the lower pressure side of the diaphragm. It should be noted that this method is suitable for measuring small differential pressures.
Advantages
* Intrinsic production of digital signal;
* Good accuracy and repeatability;
* Stability;
* Low hysteria;
* High resolution;
* Measurement of differential, absolute and gauge pressures.
Disadvantages
* Temperature sensitive;
* Affected by shock and vibration;
* Nonlinear output signal;
* Large (physically).
Application limitations:
Temperature changes need to be compensated. This makes the measurement sensitivity problematic. The output generated is also non-linear, which causes continuous control problems
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