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Measurement Tolerance for Calibration

Measurement Tolerance for Calibration

Measurement Tolerance for Calibration

(OP)
Greetings!

I'm working on a calibration plan where tolerance is part of the requirement as basis on when to conduct a calibration for pressure, flow, level, temperature, pH and conductivity transmitters aside from the frequency. On mechanical-type gauges, are tolerances of these instruments be the same as the transmitters?

Ideally, what are the tolerances of these instruments? Is 2.0% of FS acceptable?

Thanks

RE: Measurement Tolerance for Calibration

I think you're not asking the relevant questions.  Acceptability must be determined by you and your process requirements.

>  What uncertainty do you need to ensure that your process is operating correctly and under positive control?

>  What uncertainty do the primary and secondary standards have?

>  Is there sufficient test accuracy ratio (TAR) (ideally  more than 4:1)?

>  If not, is there an alternative?

TTFN

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