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Introduction to the Accuracy Index of Pressure Transducer

1. Basic indicators of pressure transducer

(1) Zero output: 

The output value of the sensor when the applied pressure is zero under indoor conditions.


(2) Full-scale output: 

The absolute value of the difference between the upper limit output value of the sensor measurement and the lower limit output value of the measurement.


(3) Sensitivity: 

The ratio of the increment of sensor output to the corresponding increment of input.


2. Pressure transducer accuracy index

It includes non-linearity, repeatability, hysteresis, time drift, temperature drift, stability, accuracy (acc).


(1) Definition of pressure transducer accuracy


The degree of agreement between the measurement result of the tested sensor and the agreed true value is the accuracy. It depends on the size of the systematic error band and the random error band. Systematic error refers to the error with the same size and direction in multiple measurements; random error refers to the error with uncertain size and direction in multiple measurements; usually the error that occurs in the measurement that is only performed once is regarded as random error; The instrument error determined by only one calibration is regarded as a systematic error.


(2) Three main indicators of pressure transducer accuracy:


① Non-linearity: the degree of deviation of the calibration curve from a specified straight line. (Linear calibration: through linear calibration, the actual curve is closer to the best fitting straight line, and higher non-linear accuracy is obtained. Methods include: analog method calibration, digital multi-point calibration)


②Repeatability: Under all the following conditions: the same measurement method, the same observer, the same measuring instrument, the same location, the same use conditions and repeated in a short period of time, the degree of agreement between the results of multiple consecutive measurements of the same measured sensor accuracy.


③Hysteresis: The maximum difference in output occurs when the measured value increases and decreases at the same test point within the specified range.


3. Other indicators of pressure transducer

Other indicators of pressure transducer sensor include zero temperature coefficient; full-scale temperature coefficient; time drift (short-term stability); long-term stability. 


(1) Zero temperature coefficient: 

The ratio of zero point changes with temperature changes under specified time intervals and indoor temperature conditions.


(2) Full-scale temperature coefficient: 

The ratio of full-scale changes with temperature changes under specified time intervals and indoor temperature conditions.


(3) Time drift (short-term stability): 

In a short period of time, the ratio of zero/full scale changes with time. (Generally refers to 8 or 24 hours, you can also customize the time, mv/V *24h)


(4) Long-term stability: 

In a long-term period, the ratio of zero/full scale changes with time. (Generally refers to 1 year, such as 0.1%FS/year)

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