Pressure Gauge Range Selection Standard

Asme b40 100 recommends that normal operating pressure be confined to 25 75 of the scale.

Pressure gauge range selection standard.

When it comes to the highest accuracy within wika s broad selection you will also find precision pressure gauges measuring with accuracies of 0 1 0 25 or 0 6 of the full scale value. For a mechanical pressure gauge accuracy is defined either as a percentage of the full scale range or a percent of the span. Some examples are shown. 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. Gauge accuracy pressure gauge accuracy ranges from grade 4a to d according to asme 40 1. The maximum operating pressure should not exceed 75 of the full scale range. 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.

Conclusion to properly select a pressure gauge consider the gauge process range environment accuracy dial. It is important to select a pressure range that is approximately twice the normal operating pressure of the media. If pulsation is present in the process maximum operating gauge pressure should not exceed 50 of the full scale range. 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.