Filling liquids in pressure gauges: Usage and advantages

Liquid-filled pressure gauges are used in applications that involve high dynamic shock and vibration loading. The filling liquid dampens the vibrations that occur and therefore takes the load off the mechanical the different parts of the pressure gauge.
Pressure gauge with filling liquid ? model 213.53
Use of filling liquids
With regards to the operating conditions, glycerine-water mixtures or silicone oils will be the most regularly used filling liquids. Glycerine-water is suitable for nearly all applications and ambient temperatures. Particularly for low pressure ranges, it makes sense to use it, as a result of low density of the liquid and the associated low resistance on the pressure element. Silicone oil is primarily relied upon when the pressure gauge is subjected to particularly high (> +60 �C) or suprisingly low (< -20 �C) temperatures.
The case of the pressure gauge is not completely filled, since, depending on humidity and ambient temperature, the filling medium absorbs additional water and expands accordingly. To provide sufficient space for this expansion and to avoid the case from leaking, the case is only filled to 80% ? 90% by default (see Figure of model 213.53).
Pressure gauge without filling liquid ? result: vibrating pointer
Advantages of filling liquids
The filling liquid dampens any pressure peaks, shocks and vibrations that occur and protects the mechanics of the pressure gauge. Thus, Attack and malfunction is counteracted.
An additional factor ? decisive for an individual ? is to ensure the readability of the prevailing pressure. Inspiring filling liquid causes the pointer?s motion to be limited, even under severe vibration loads. Without liquid damping, the pointer wouldn’t normally show the actual applied pressure, but rather proceed to and fro in relation to the frequency of the vibrations prevailing in the application. In case of resonance, a deflection angle of over 180 � might even occur.
Liquid-filled pressure gauges are ideal for various applications, specifically processes involving shock and vibration.
Should you need any more help or advice for the specific application, your contact will undoubtedly be glad to work with you.
Discover more about advantages and application areas of pressure gauges with liquid filling in the following video:

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