Process GC Calibration

[ashokpershad]

Hi!! Firends,
I have small doubt.
We have some process Gas chromatographs which are calibrated on the basis of LAB results. Frequesntly we find that the LAB and Online GC readings mis-matches and in that case every time we perform the Online GC calibration on the basis of LAB readings. I feel it as over-correction.
Is this the correct method to get same results? If NO then please suggest what should be the right way of doing it?

Thanks, waiting for your valueable answers...

[Muhammad Akbar Khan]

Hi Pershad,

This method is ok for inhouse training, but not good for testing samples, try to get some calibration gas standard and use them for calibration.

Regards
Akbar

[rb6banjo]

Both instruments should be calibrated independently. Maybe you use the same calibration mixture but it should be performed on both instruments so that the response factors are right for the instrument in question.

If you analyze the an independent sample on both instruments and don't get the same answer, you should really try to figure out why that is happening (nonlinear range of the detectors, sample-size mismatch, etc.).