When is liquid-filled gauge case venting necessary?
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 decreased 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.
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