FEATURE CALIBRATION
the various factors should be evaluated and documented. A calibration certificate must state the measurement uncertainty otherwise the measurement cannot be quantified, and as such, the results can be considered meaningless. This is commonly overlooked when comparing certificates between one laboratory and another, and quite often is the reason a calibration is very cheap compared to another laboratory.
One key element of any calibration
is the laboratory’s ability to assign a measurement uncertainty to any calibration it performs
CALIBRATION INTERVALS In addition, “How often should I get my instrument calibrated?” is another question. This will typically depend on how the instrument is used, how frequently it is used, and how it is stored. The basis to determine the frequency comes back to the calibration data. As mentioned, good calibration
laboratories check their reference instruments between calibrations, but this is not always possible for everyone. If this is the case, then the typical standard approach would be to calibrate a new instrument more frequently to begin with. The frequency of the calibration can then be evaluated and increased based upon this initial data. The consequences of an incorrectly
calibrated device can be severe. If an instrument is found to be outside of specification when presented for calibration, numerous inaccurate results could have been recorded. And, it might not be possible to determine how many inaccurate results have been recorded and over what period – which could result in expensive retesting, product recalls resulting in rework, endangering life and, in some extreme cases, corporate manslaughter litigation. It is therefore important when
requesting a calibration to understand if your instrument is ‘within specification’. Both pre- and post-adjustment calibration results can be requested.
ACCREDITED LABORATORIES While calibration has costs associated with it, it should never be overlooked or
chosen on the basis of cost alone. There is a responsibility to ensure the calibration you purchase and the calibration certificate will stand up to the rigours of any inspection or audit. At Testo we continue to optimise our
processes and look for ways we can reduce the price of our calibration services – but we do this without compromising on quality. Automating processes will continue to be a key part of our future. There are a range of calibration
instruments available, such as the Testo Pneumator, a versatile range of portable pressure calibrators available in four ranges: one, 10, 100 and 1000hPa. The Testo: Huminator, a precise benchtop humidity calibrator, has programmable functionality and the possibility to calibrate up to five probes at any one time. The third calibration instrument in the series is the Testo Thermator, a multi-functional benchtop temperature calibrator. This comes with the flexibility to be used in four different modes: liquid bath, block, infrared and surface temperature; and provides the user with quick and easy operation. Testo’s calibration laboratory is
accredited in the parameters of Temperature, Humidity, Dew Point, Airflow, Pressure and on-site
calibration. In addition to this the laboratory is also able to calibrate Electrical, Gas and Lux instruments, plus TPM for Testo’s range of cooking oil testers. The calibration services are, however, not limited to just Testo’s own instruments, other manufacturers’ instruments can also be calibrated. As well as calibration services, Testo
also offers additional instrument solutions such as PRIMAS Online. This is a calibration and test equipment management solution which allows you to access your calibration and test equipment data via the internet regardless of location and time. Data can be accessed by any device as
long there is connection to the internet. It is secure with easy and intuitive operation, access to your equipment data regardless 24/7, free of charge download of your calibration certificates, dynamic evaluation of your testing equipment including call-off lists and escalation scenarios, and there is no additional software installation required. PRIMAS has the flexibility which allows you to manage your own inventory or Testo can manage this for you. In addition, a temperature mapping
Testo’s calibration
laboratory is accredited in the parameters of
Temperature, Humidity, Dew Point, Airflow, Pressure and on-site calibration
14 SEPTEMBER 2016 | INSTRUMENTATION
service is provided for environments such as warehousing and storage facilities. Temperature mapping can also be an important factor in determining the correct locations and quantity of sensors required when specifying the Saveris monitoring system. Saveris is available as a wireless or Ethernet based system, while Saveris 2 is a cloud based data logger. Both ranges of products are supported with maintenance packages to include calibration, routine checks, immediate replacement of faulty units and free of charge remote support.
Testo T: 01420 544433
www.testolimited.com
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