What is Calibration? Why Calibration is important? Frequency of calibration

What is Calibration?

Calibration is a set of operations that establish, under specified conditions, the relationship between the values of quantities indicated by a measuring instrument and the corresponding values realized by standards.

A certificate of calibration commonly contains a list of values determined by a standard, which is checked against a corresponding list of values indicated by the instrument under test and a list of the differences between these values.

Why Calibration is important?

Calibration describes the measurement precision and performance collected using a piece of machinery. Over time there is a tendency in machinery to dirt from their accuracy, when using specific techniques or evaluating specific parameters such as heat and moisture.

So that calibration should be done periodically to ensure that the instruments work properly as standard. These are the main point for, why calibration is important:

  • Calibration keeps process safe

  • Machine Calibration can help to reduce costs from manufacturing errors

How frequently instruments should be calibrated?

There are two considerations that are particularly important to make. First, was the device calibrated at least twice before, with one calibration being quite recent, without adjustment? If not, are there any test data for similar devices?

Second, what uncertainty of measurement is needed? If the previous data shows that the device is significantly better reproducible than the uncertainty needed, the recalibration period can be long.

  • Calibrate instruments on the basis of manufacturer recommendation.

  • Before and after critical measuring project.

  • Monthly, quarterly, or semiannually

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@sivaranjith Could you please explain how the calibration of pressure switches and gauges can be done through the use of: 1) dead weight and 2) a hand pump? Thank you in advance.