Liquid Filled Stainless Steel and Dry Pressure Gauges
Questions & Answers
- What are the advantages of a liquid filled gauge?
- Liquid-filled pressure gauges provide a number of advantages: The liquid absorbs vibration and pressure spikes. The dampening action of the liquid enables the operator to take readings during conditions of rapid dynamic loading and vibration The liquid lubricates all moving elements, dramatically reducing wear in the movement Because most liquid-filled gauges are filled with non-aqueous liquid and hermetically sealed, they perform in corrosive environments and are immune to moisture penetration and icing, and shock effects are lessened. Liquid-filled gauges enhance the reliability and integrity of the measuring system for long periods under extreme operating conditions.
- Why do you have to vent a liquid filled gauge?
- For pressure gauges with full scale ranges of 300 PSI and below (including vacuum and compound ranges of 30” HG-0-200 PSI and below), case venting (after the gauge is installed) is necessary to preserve the accuracy. Temperature fluctuations during shipment and in the process application cause the liquid filling to expand and contract which in turn increases or decreases case pressure. As a result, accuracy can be decreased and the pointer may not return to zero properly until the gauge is vented to the atmosphere.
- What is the venting procedure for liquid filled gauges?
- Due to pressure build up, some gauges (usually lower pressure ranges such as vacuum, up to 300 psi) may reflect a reading that is slightly "off zero". To properly "vent" the pressure gauge, cut off the tip of the fill plug after you have installed the instrument. This allows the gauge to be equal to the atmospheric pressure.
- What kind of liquid is in your liquid-filled gauges?
- The type of liquid used to fill the gauge varies with the application. Our gauges use pure glycerine which provides the best performance in most applications.
- What pressure range should a pressure gauge work in?
- A gauge range of twice the working pressure is generally selected. The working pressure in all cases should be limited to 75% of the gauge range. Where alternative pressure and pulsation are encountered, working pressure should be limited to 2/3 of the gauge range.
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