Why pressure gauge filled with liquid

Why pressure gauge filled with liquid

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Bourdon tube pressure gauges are often filled with liquid, typically oil, to transmit the pressure from the sensing element (the Bourdon tube) to the gauge's indicator mechanism. The liquid helps dampen any vibration or pulsation in the pressure being measured, which can improve the accuracy and stability of the gauge reading. Additionally, the liquid can help lubricate the moving parts of the gauge, which can extend its lifespan.
The oil used in bourdon tube pressure gauges is typically a high-grade mineral oil that has been refined to remove impurities and contaminants. It is important to use a suitable oil that is compatible with the materials of the gauge, and to ensure that the oil remains at the correct level and does not leak out over time. Some manufacturers may also use other types of fluids or gases, such as glycerin or nitrogen, depending on the application and requirements of the gauge.