Selection of a calibrator (pressure generator, temperature) for my field devices

O

ozthebe

#1
Hi everyone, i have to select a calibrators (pressure generator, temperature) for my field devices such as pressure transmitters, RTDs, TCs.. I have been told that calibrator has to be 3 times more accurate than instrument itself.

For example, when i check the data sheet of a pressure transmitters i see various accuracies from +/- 0.11 to to 0.18 of span and the calibrator i have found has ± 0.05 % FS accuracy. Does my calibrator matches the requirement? Generally, i am trying to learn the selection of calibrators in terms of accuracies and if any other parameters..

Thanks,
 
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dwperron

Trusted Information Resource
#2
You have the right idea, but you need more information.

For instance, your pressure calibrator has a ±0.05% FS accuracy. If you have a 300 psi calibrator you end up with an accuracy of ± 0.15 psi
If you calibrate a 30 psi transmitter with a 0.11% span tolerance that would be an accuracy of ±0.033 psi, so this calibrator is nowhere near accurate enough.

You are going to need to know the ranges as well as the accuracies of your instruments and calibrators.

As for the 3X accuracy ratio, that was the requirement in ISO 10012. Today a 4:1 ratio is accepted as the minimum accuracy ratio between the calibrator and the unit under test, and if you use a ratio less that 4:1 you need to declare it in the results. And it will depend on the quality standard(s) that you are complying with. Each has its own requirements.
 
O

ozthebe

#3
Thank you for your considerstions its very helpful, now i understand i have to look at instrument ranges or maybe calibration ranges of my instruments since i have specific ranges on process for each instrument i have got.
 
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