Extending Calibration Schedule Base on First Use Date

by Tim

I’d like to know whether it’s an acceptable practice to store a piece of calibrated equipment for a period of time, then “start the clock” on the calibration interval when the equipment is used for the first time. For example, you have a pressure gage, torque wrench, or micrometer that was calibrated on 6/1/15. The next calibration due date shown on the label and the certificate of calibration is 6/1/16 (1 year). After calibration, this piece of equipment gets placed in storage and is not used. On 9/1/15 there is a need to begin using this piece of equipment. It’s been suggested to me that the calibration can be considered valid through 9/1/16 because the item’s use does not exceed 1 year. Of course records would be kept to reflect the in-service date, and the label would be edited to show the new calibration due date. As I’ve never seen a calibration program where this is done, I question w

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