PRESSURE GAUGE
   
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  Chemical Diaphragm Seals/Gauge Protection
  Chemical Compatibility Table
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Accuracy

Gauges are available with accuracies from +/-3/2/3% to 0.1% of span (ASME grade B to grade 4A) Gauges with +/-3/2/3% of span accuracy offer a +/-2% of span accuracy over the middle third of the scale and +/-3% of span on the balance of the scale. Generally, bourdon tube gauges with better accuracies are larger and more expensive.


ASME B40.1

GRADE                         ACCURACY

4A  +/-0.1%                 Full Scale

3A  +/-0.25%                Full Scale

2A  +/-0.50%                Full Scale

1A  +/-0.105%               Full Scale

A   +/-2-1-2%     +/-1% over middle of scale, +/-2% over first and last 1/4 of scale

B   +/-3-2-3%     +/-2% over middle of scale, +/-3% over first and last 1/4 of scale

C   +/-4-3-4%     +/-3% over middle of scale, +/-4% over first and last 1/4 of scale