Calibration Due Dates

At a recent audit unitemp was informed that SANAS will no longer allow any due date sticker or notification on a certificate without authority from the owner of the instrument. SANAS feels that the lab cannot say if an instrument is dropped or mistreated, once it is outside lab control, and thus is unable to say if the instrument is maintaining the measured values on the calibration certificate.

SANAS also feels that the harshness and accuracies of the environment where the instrument is used will affect the need for calibration, and can thus affect calibration intervals i.e. shorten or lengthen.

Finally, SANAS will not allow laboratories to influence customers' budgets by prescribing calibration intervals. SANAS thus advised that if no letter of authority is received from the client, no calibration due date should be specified at all.
unitemp's opinion is that, while a one year calibration interval is very common and easy to administer, an official letter or e-mail on your required interval is needed, before printing any due date in future. This letter of authority needs to be forwarded from the Head Office or CEO. Your letter of authority will be filed for reference by SANAS.

The determined interval is the client's Quality System commitment to calibrate their instrument at any laboratory before the due date and cannot be enforced by unitemp. The best means to determine if the interval is sufficient for a specific quality would be to monitor failure rates and adjust accordingly.

unitemp thus asks that clients seriously consider their required calibration interval, and inform them as soon as possible.

unitemp will, however continue to send reminders to clients on an annual basis unless the interval specified by you is changed.

For further information please contact Roy MacGregor, Lab Head, on 021 762 8995.

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