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What are the performance indicators of the flow meter?

The quality of the meter can be reflected by its accuracy, reproducibility, sensitivity, response time, zero drift and range drift.
(1) Accuracy: Also called accuracy, that is, the accuracy of the measurement result of the meter is close to the real value. It can be expressed in absolute or relative error:
1 absolute error = measured value - true value
2 relative error = absolute error / true value
No instrument can measure the true value of the measured parameter absolutely accurately, and only the ability to make the measured value close to the true value. In practical applications, only the standard instrument indicating value with higher accuracy can be used as the true value of the measured parameter, and the difference between the indicating value of the measuring instrument and the indicating value of the standard meter is the measurement error. The smaller the error value, the higher the reliability of the measuring instrument.
(2) Reproducibility: refers to the difference between the measured value and the average value relative to the maximum scale range when the same meter is used to repeatedly measure a parameter with the same measurement conditions. This is an important indicator of the stability of instruments and instruments. It is generally required to be inspected at the time of commissioning and daily calibration.
(3) Sensitivity: refers to the sensitivity of the meter measurement. The amount of change in the output of a commonly used meter is expressed as the ratio of the amount of change in the measured parameter that caused the change.
(4) Response time: When the measured parameter changes, the measured value indicated by the meter will always be accurately expressed after a period of time. The time when the measured parameter lags behind the measured parameter is the response time of the meter. Some use time constants (such as thermal resistance temperature measurement), and some use damping time (such as ammeter measurement resistance).
(5) Zero drift and range drift: refers to the percentage of the average change value relative to the range after multiple measurements on the relative zero and maximum range confirmed by the meter.

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