Liquid Filled Gauge
In pressure ranges equal to or greater than their dry counterparts, liquid-filled pressure gauges are available. Although silicone or other liquids are sometimes used, their casings are filled with fluid, usually glycerine. The liquid coats the inner parts and appears on the face of the gauge. Having the fluid inside works to dampen the pulsation and pressure spikes effect-which is another advantage over selecting a dry gauge. This means that the pressure gauges are less likely to give inaccurate readings due to wear and tear caused by mechanical vibration and pulsation. The liquid in these pressure gauges has a double duty to combat these effects. Not only does it help to mitigate the vibration effect, but it also lubricates the moving parts of the gauge, reducing daily friction. The filling also has the advantage of avoiding internal corrosion. As the bourdon tube and movement are covered with a liquid that keeps moisture and other corrosive substances at bay. All these factors add up to longer service life and lower replacement costs over dry pressure gauges for liquid-filled pressure gauges. And they are definitely a consideration in environments where vibration and condensation are a factor.
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