I’d like to ask everyone for some insights regarding the blind spots in the calculation of instrument accuracy! Thanks
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Assume that a pressure transmitter has a maximum measurement range of -100 to 250 kPa and an accuracy of 0.2% FS. When it is used in the field, the range must be adjusted to -100 to 0 kPa. How should the maximum error of this transmitter be calculated in this case? When I reduce the range, does the precision decrease, increase, or remain unchanged? What should be done if the maximum error is to be kept within 20 Pa?
Instrument accuracy is a parameter defined during instrument design, representing the maximum allowable percentage error of the measured range at the time of manufacture. In actual use, adjusting the range up or down still adheres to this precision. That is 0.2% of 350 kPa.
The maximum allowable value is calculated based on the range and accuracy class; if the range is reduced within the range of adjustments permitted by the manufacturer, the maximum allowable tolerance will also decrease.