The reading accuracy of a flowmeter represents the maximum allowable value of the relative error of the instrument, while the full-scale accuracy is the maximum allowable value of the instrument’s quoted error.
For example, if the full scale of a flowmeter is 100 m³/h, when the actual flow rate is 10 m³/h:
- If the flowmeter has a reading accuracy of 1%, the measured value of the instrument should be within the range of 9.9 – 10.1 m³/h [10 ± (10 × 0.01)].
- If the flowmeter has a full-scale accuracy of 1%, the displayed value of the instrument should be within the range of 9 – 11 m³/h [10 ± (100 × 0.01)].
When the actual flow rate is 100 m³/h:
- If the flowmeter has a reading accuracy of 1%, the measured value of the instrument should be within the range of 99 – 101 m³/h [100 ± (100 × 0.01)].
- If the flowmeter has a full-scale accuracy of 1%, the displayed value of the instrument should be within the range of 99 – 101 m³/h [100 ± (100 × 0.01)].
Post time: Mar-24-2025