Pressure Gauges: Liquid-Filled vs. Dry Pressure Gauges

What’s the difference between liquid-filled and dry pressure gauges?

Most pressure gauges you find will be a dry pressure gauge, mostly seen on items like bicycle pumps, compressors, air and gas regulators, and more. A dry pressure gauge is affordable and accurate enough for most applications, and if something breaks, it’s affordable enough to replace without a second thought. HOWEVER, over time or in more extreme conditions, a dry pressure gauge’s dial can collect moisture making the dial impossible or difficult to read. Of course moisture can freeze in cold enough conditions, which can result in the gauge not working at all.

Why is a liquid-filled pressure gauge better?

A liquid-filled pressure gauge is typically filled with glycerine, which coats the internals of the gauge and fills the dial.

If the vessel’s pressure readings are volatile, a dry pressure gauge may be a bit jumpy with spikes and pulsations, while a liquid-filled pressure gauge will be much easier to read. Vibration will also have a greater effect on a dry gauge’s reading as well as wear and tear. The glycerine in a liquid-filled gauge lessens the effect of vibrations, while also lubricating the internal parts, and preventing corrosion.

Overall, a dry pressure gauges and liquid-filled pressure gauges can perform the same functions, however a liquid-filled pressure gauge will do these functions just a little bit better.

If you’re looking to upgrade your system, or simply want the best for a new system, consider a liquid-filled pressure gauge.