Selecting a pressure gauge in 7 steps.
Pressure gauge range selection chart.
For the various requirements in industrial and process instrumentation there are pressure elements from copper alloys stainless steel or special materials.
Conditions affecting wear of the system.
Conclusion to properly select a pressure gauge consider the gauge process range environment accuracy dial.
Standard dual scale metric ranges have a dominant metric inner scale the outer scale is specified in psi.
Differential pressure gauge selection matrix ashcroft differential pressure gauges are available in a wide array of ranges mounts and materials.
Gauge accuracy pressure gauge accuracy ranges from grade 4a to d according to asme 40 1.
Ashcroft s differential gauges are the right choice for your industrial application.
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.
The working pressure in all cases should be limited to 75 of the gauge range.
Where alternating pressure and pulsation are encountered working pressure should be limited to 2 3 of the gauge range.
The normal operating range should be in the middle half of the range between 25 and 75 of the full scale range.
For a mechanical pressure gauge accuracy is defined as a percentage of the full scale range while requirements differ from one industry to another the following are general guidelines.
A gauge range of twice the working pressure is generally selected.
Pressure gauge selection considerations in selecting a pressure gauge 4 range the maximum operating pressure should not exceed 75 of the full scale range.
Some examples are shown.
Pressure ranges asme b40 100 recommends that normal operating pressure be confined to 25 75 of the scale.
Ashcroft s dp gauges makes it easy to see pressure differential from two separate inputs displayed on one gauge.
To select the correct pressure range for a gauge where there is dynamic pressure with potential of pulses and surges choose a full scale pressure where the operating pressure occurs in the middle half 50 to 75 percent of.
For a mechanical pressure gauge accuracy is defined either as a percentage of the full scale range or a percent of the span.
To select the right pressure gauge for your application the following factors should be considered.
