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The Importance Of Calibrating Process Instrumentation

May 11, 2017 | by BEKO Technologies Ltd
Category Calibration       Hits: 568
calibration lab

The main reasons for this are to ensure the reliability of the instrument, that it can be trusted. To determine the accuracy of the instrument and to ensure the readings are consistent with other measurements

Considering the costs arising from legal action for damages that might be filed against you, the expenses for proper calibration and adjustment are minor in comparison. Companies who take their responsibility seriously and wish to establish long-term business relationships therefore need to calibrate their equipment regularly. It could also void your warranty if your instrument is not calibrated.

No quantitative data – no quality assurance

Accurate measuring is probably the most effective way of averting costly repairs or even claims for damages. This applies in particular in the context of international standards for quality management systems (e.g. ISO 9000 ff., HACCP), and also with regard to claims based on product liability legislation.

Calibration and adjustment

A measurement error is the difference between a measured value of quantity and its true value. Such errors tend to become more frequent the longer a device is in operation. At some time, the deviations might be so great that they are no longer within the specifications, which means that quality is no longer assured.

By calibrating the device, the measurement error can be determined and documented. If the measurements are outside the permissible range, the device needs to be adjusted. In this process, the measuring instrument is reconfigured so that measurement errors are minimised and deviations from the setpoint value are within the device specifications.

One-point or multiple-point calibration?

One-point calibration is sufficient for quality assurance under static operating conditions. Compressed air systems are however generally run under constantly changing, dynamic ambient and operating conditions, which cause the quality of the compressed air to fluctuate within the measuring range and between the system-defined limits (such as those of the compressed air quality classes according to ISO 8573.1).

To accurately capture the values across the entire operating range, multiple-point calibration is therefore simply a must, although it is a much more time-consuming and costly task.

Five-point calibration as manufacturer standard

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