For a mechanical pressure gauge accuracy is defined either as a percentage of the full scale range or a percent of the span.
Pressure gauge range selection chart.
Some examples are shown.
Pressure ranges asme b40 100 recommends that normal operating pressure be confined to 25 75 of the scale.
For the various requirements in industrial and process instrumentation there are pressure elements from copper alloys stainless steel or special materials.
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 pressure gauges cover scale ranges from 0 0 5 mbar to 0 6 000 bar and indication accuracies of up to 0 1.
Standard dual scale metric ranges have a dominant metric inner scale the outer scale is specified in psi.
To select the right pressure gauge for your application the following factors should be considered.
Pressure gauge range selection should also permit the desired readable scale increments from a required viewing distance.
Ashcroft s differential gauges are the right choice for your industrial application.
Differential pressure gauge selection matrix ashcroft differential pressure gauges are available in a wide array of ranges mounts and materials.
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.
Selecting a pressure gauge in 7 steps.
Ashcroft s dp gauges makes it easy to see pressure differential from two separate inputs displayed on one gauge.
Where alternating pressure and pulsation are encountered working pressure should be limited to 2 3 of the gauge range.
The working pressure in all cases should be limited to 75 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.
Pressure gauge selection considerations in selecting a pressure gauge 4 range the maximum operating pressure should not exceed 75 of the full scale range.
A gauge range of twice the working pressure is generally selected.
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.
Conditions affecting wear of the system.
