Urgent Issue Alerts

Monday, February 28, 2022

Calibration Drift Tests

In accordance with 40 CFR 60 Appendix F, Procedure 1, Section 4.3.1, a calibration drift (CD) failure in excess of four times the performance specification invalidates data backwards to the most recently passed CD. Any QA tests that were performed during the invalidated period are also invalidated. CiSCO encourages facilities to perform an additional CD immediately following CGA and RATA tests. In the unlikely event that the additional CD fails in excess of four times the performance specification, the facility will have the opportunity to immediately correct the CD failure and perform the invalidated test(s) again. This is preferable to discovering at a later date that a subsequent CD failure invalidated the QA tests.