Pressure Gauge Range Selection Standard

Conclusion to properly select a pressure gauge consider the gauge process range environment accuracy dial.

Pressure gauge range selection standard.

Duragauge gauges are made in accordance with asme b40 1 enti tled gauges pressure indicating dial type elastic element accuracy grade 2a 0 5 of span the accuracy of a retard range gauge applies. Gauge accuracy pressure gauge accuracy ranges from grade 4a to d according to asme 40 1. Liquid filling of the case ensures precise readability for the pressure gauge even with high dynamic pressure loads and vibrations. Pressure gauge scale ranges scale spacing and scale numbering per en 837 wika data sheet in 00 02 wika data sheet in 00 02 12 2008 page 1 of 4 in general the design of the scale depends on scale range nominal size ns diameter of case and accuracy class of a pressure gauge.

If pulsation is present in the process maximum operating gauge pressure should not exceed 50 of the full scale range. Some examples are shown. The maximum operating pressure should not exceed 75 of the full scale range. For a mechanical pressure gauge accuracy is defined either as a percentage of the full scale range or a percent of the span.

If a gauge is not selected considering these criteria it may result in fatigue of the bourdon tube. To select the right pressure gauge for your application the following factors should be considered. Asme b40 100 recommends that normal operating pressure be confined to 25 75 of the scale. It is important to select a pressure range that is approximately twice the normal operating pressure of the media.