Please guide about following,
Thanks and Regards,
In reply to Raymundo Morin:
You can potentially go several weeks or months without calibration, we rarely calibrate our machines even in custody transfer applications but we do perform regular validation cycles to ensure that the GC has not drifted significantly. Some of our machines have not been "calibrated" in more than a year and still pass the GPA guidelines for repeatability and reproducibility. As far as an expired calibration standard, going past the expiration date does not automatically mean that your standard is no longer valid nor does a certificate that isn't expired ensure that the standard is valid. A fidelity plot for your response factors along with a "Round Robin" sample of an alternate calibration standard as an unknown can ensure that your calibration blend composition has not changed significantly both before the expiration date and after. I have seen companies utilize these methods to use their standards beyond the expiration date to reduce waste.
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