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ENGINEERING


GAUGE ACCURACY


Accuracy is defined as the conformity of an indication to its true value. Accuracy is a percentage of the full range. For example, a gauge that has a scale of 0-300 psi with an accuracy of ±1% would mean that the gauge is accurate to within ± (plus or minus) 3 psi.

Accuracy Grade – ASME B40.1 (American Society of Mechanical Engineers)

Accuracy Grade

Lower 1/4 of scale

Middle 1/2 of scale

Upper 1/4 of scale
4A 0.1 0.1 0.1
3A 0.25 0.25 0.25
2A 0.5 0.5 0.5
1A 1 1 1
A 2 1 2
B 3 2 3
C 4 3 4
D 5 5 5

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