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regarding the calibration duration

regarding the calibration duration

regarding the calibration duration


I calibrated a detector on 10th Feb 2014, with a enclosed tag that addressed the due time is 10th Feb 2015, But after calibration the detector was not used anymore, only stored in the initial box and kept an calibration status. from 6th May 2016, we start to used this detector in working, But now the third part inspector says that the detector has out of calibration because of the due time tag.

the question is, after calibration, the useless time could be counted in the calibration duration, in my opinion, because the detector kept in an calibration status after calibration, so the time from calibration to the initial using day cannot be counted in the calibration duration. the calibration duration start time must be counted from the initial using time.

RE: regarding the calibration duration

Sorry, that's just bad logic. Unpowered components still age and fail; you have no idea what temperature environment the unit underwent. The issue is that someone started using the instrument either without reading the calibration tag, or ignoring what was on the calibration tag. That's a complete breakdown in procedure, and all of your test results are potentially invalidated. However, should your calibration show that nothing was completely out of bed, you could possibly argue that it's not likely that the instrument went out of, and then back into, calibrated range.

TTFN (ta ta for now)
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RE: regarding the calibration duration

Your inspector is correct. The detector calibration is only valid for the dates noted. If you don't agree, then you need to revise the calibration procedure for the detector to allow a calibration period of 1 year after the instrument is first used after the most recent calibration, assuming this would be acceptable to your QA folks.

RE: regarding the calibration duration

It is only logical to calibrate something just before you use it - not over 2 years before you use it.
The TPI is perfectly correct - the dates listed (calibration date and expiry date)are the only things that matter.

RE: regarding the calibration duration

the project which will using the detector is postpone because of all actual factor.

I know it very clearly, the calibration interval cannot be recommended or determined by the calibration agency, the user of the detector shall keep the equipment in a good condition and in a valid calibration duration. but the calibration interval shall be determined by the user.

the small tag attached by the calibration agency which indicated an due time is invalid and cannot be regarded as the evidence of re-calibration.

if the qualify control program addresses the calibration interval, the user will re-calibrate the equipment as per the provision, if not, the user can determine whether the equipment need to be re-calibrated by himself.

this point is addressed very explicitly in ISO 17025 A calibration certificate (or calibration label) shall not contain any recommendation on the
calibration interval except where this has been agreed with the customer. This requirement may be
superseded by legal regulations.

RE: regarding the calibration duration

So let's say you buy a widget with a one year warranty and store it in a closet for one year. Does the warranty begin the day you purchased the widget, or, assuming it was stored for a year, the first day said widget was used for the first time?

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