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"Since 1996 we have received the same level of service from Biometrix...Excellent! Whether it is a request for same day calibration at the lab or in-house, I know customer satisfaction is a top priority. I like the fact that I can relax and know my calibration needs are being handled by a professional, knowledgeable staff. Kudos for a job well done, every time!"

- Calibration Manager for manufacturing facility

What is Calibration?
The goal of calibration is to ensure that the output of a measuring device is accurate. Calibration is reassurance that your pressure gauge, chart recorder, temperature display, or any other critical equipment that is relied upon daily is telling you the truth.

Calibration is performed by comparing a device or the output of an instrument to a standard having known measurement characteristics. For example, the accuracy of a pressure gauge can be calibrated by applying a known amount of pressure to the gauge and comparing the known pressure value with the reading on the gauge face. Once the relationship of the pressure gauge to the standard is known and accepted, the pressure gauge can be used to measure the pressure of other equipment or systems.

To improve the quality of the calibration and have the results accepted by outside organizations, it is desirable for the calibration and subsequent measurements to be "traceable" to the internationally defined measurement units. This is often accomplished by a formal comparison to a standard which is directly or indirectly related to national standards (NIST in the USA), international standards, or certified reference materials.

Quality management systems call for an effective metrology system that includes formal, periodic, and documented calibration of all measuring instruments. ISO 9001 and ISO 17025 require effective calibration systems.

Calibration can be required when an instrument:
  • is acquired
  • has an elapsed calibration interval
  • has measurements that are questioned
  • has been serviced/repaired
  • has been decommissioned
  • has had a shock or vibration (such as a being moved or dropped), which potentially may have put it out of calibration

Equipment tolerance and operating range are critical parameters of the calibration process. The calibration tolerance is defined as the maximum allowable deviation between a standard of known accuracy and your instrument. Equipment inaccuracies that exceed the specified tolerance can usually be adjusted. Calibration technicians will always record as-found data (this documents instrument performance prior to adjustments) and if a calibration adjustment is made, the technician will record as-left data (this documents instrument performance following adjustments).

Unfortunately, not all instruments can be adjusted. Glass thermometers are an apparent example of this. Calibration technicians can verify and document the accuracy of a glass thermometer. If the difference between the instrument and standard exceeds the specified tolerance, there is no alternative but to dispose of the thermometer and replace it.

Click here for an example of the calibration process.