A&B 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)
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| 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% |
EN837-1 Accuracy Table (nominal gauge size vs accuracy class)
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|---|
| Nominal Size | 0,1% | 0,25% | 0,6% | 1% | 1,6% | 2,5% | 4% |
| 40 & 50 | | | | | x | x | x |
| 63 | | | | x | x | x | x |
| 80 | | | | x | x | x | x |
| 100 | | | x | x | x | x | |
| 150 & 160 | | x | x | x | x | | |
| 250 | x | x | x | x | x | | |
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