Bourdon Pressure Gauge
Bourdon pressure gauge is used to measure pressure.
Bourdon tubes measure gage pressure, relative to ambient atmospheric pressure, as opposed to absolute pressure; vacuum is sensed as a reverse motion. When the measured pressure is rapidly pulsing, such as when the gauge is near a reciprocating pump, an orifice restriction in the connecting pipe is frequently used to avoid unnecessary wear on the gears and provide an average reading; when the whole gauge is subject to mechanical vibration, the entire case including the pointer and indicator card can be filled with an oil or glycerin. Typical high-quality modern gauges provide an accuracy of ±2% of span, and a special high-precision gauge can be as accurate as 0.1% of full scale.
Basic Principle of Bourdon tube pressure gauge:-
Diagram Of Bourdon tube Pressure Gauge :
Construction Of Bourdon tube Pressure Gauge:-
Operation of Bourdon tube:-
This displacement of the free closed end of the bourdon tube is proportional to the applied pressure. As the free end of the bourdon tube is connected to a link – section – pinion arrangement, the displacement is amplified and converted to a rotary motion of the pinion. As the pinion rotates, it makes the pointer to assume a new position on a pressure calibrated scale to indicate the applied pressure directly. As the pressure in the case containing the bourdon tube is usually atmospheric, the pointer indicates gauge pressure.
- They are used to measure medium to very high pressures.
- For measuring high pressures e.g. in steam boilers, compressors.
- For measuring pressures in vehicles tube tire.
- These Bourdon tube pressure gauges give accurate results.
- Bourdon tube cost low.
- Bourdon tubes are simple in construction.
- They can be modified to give electrical outputs.
- They are safe even for high-pressure measurement.
- Accuracy is high especially at high pressures.
Disadvantages of bourdon pressure gauge:-
- They respond slowly to changes in pressure
- They are subjected to hysteresis.
- They are sensitive to shocks and vibrations.
- Amplification is a must as the displacement of the free end of the bourdon tube is low.
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