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.