Standard dual scale metric ranges have a dominant metric inner scale the outer scale is specified in psi.
Pressure gauge range selection chart.
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 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.
For a mechanical pressure gauge accuracy is defined either as a percentage of the full scale range or a percent of the span.
Conclusion to properly select a pressure gauge consider the gauge process range environment accuracy dial.
To select the right pressure gauge for your application the following factors should be considered.
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.
Where alternating pressure and pulsation are encountered working pressure should be limited to 2 3 of the gauge range.
The pressure gauges cover scale ranges from 0 0 5 mbar to 0 6 000 bar and indication accuracies of up to 0 1.
Some examples are shown.
Differential pressure gauge selection matrix ashcroft differential pressure gauges are available in a wide array of ranges mounts and materials.
Ashcroft s differential gauges are the right choice for your industrial application.
Pressure gauge selection considerations in selecting a pressure gauge 4 range the maximum operating pressure should not exceed 75 of the full scale range.
For the various requirements in industrial and process instrumentation there are pressure elements from copper alloys stainless steel or special materials.
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.
Gauge accuracy pressure gauge accuracy ranges from grade 4a to d according to asme 40 1.
Pressure gauge range selection should also permit the desired readable scale increments from a required viewing distance.
Conditions affecting wear of the system.
