Chromatography Forum

Does anyone know what is the acceptance criteria of the GC oven which comply with ISO17025, thanks a lot~~

ISO 17025 is a general document that applies to all kinds of laboratories with different equipment, so I don't think there should be any

What kind of criteria do you talk about?

grzesiek, for lab under ISO17025, all equipments should have an annual performance check, and for GC, one of the requirement is Oven Calibration. My question is what is the acceptance criteria for the Oven, like +/- 5 degree C at each ramping temperature.

My accreditation body refer to OMIL R82 for GC performance check, however, it didn't say what is the acceptance criteria, that's why I came here to ask does anyone know, I'm pretty sure less than 5 degree C would be acceptable but I would like to have a confirmation

what's OMIL R82?

"all equipments should have an annual performance check, and for GC, one of the requirement is Oven Calibration." - I agree

"My question is what is the acceptance criteria for the Oven, like +/- 5 degree C at each ramping temperature." - there are different ovens and different analysis, that's why I said that it would be difficult to specify acceptance criteria in such document

Check with the manufacturer.
They should be able to provide you with the specifications for oven temperature variation at specific temperatures.

It's then a simple matter of placing a temperature probe (calibrated over the range) inside the oven and recording the temperature at each set-point.

Another alternative is to pay for an annual preventative maintenanace / performance verification either by the instrument supplier or by an accredited third party.

Don't forget that you probably should also be checking the performance of the inlet/injector/detector as well. We don't check the temperatures of the inlet and detector, but we do look at injector reproducibility and detector absolute response.

TimGG, who is your accreditation body? In my opinion it is unhelpful of them to refer to to OIML R82
http://www.oiml.org/publications/R/R082-e06.pdf
because this was mainly intended as a minimum standard of information to be supplied by manufacturers. It has little to do with ISO 17025 requirements and in any case the standard is not cited, even in the 2006 revision. I speak as someone who was on the 1989-90 drafting committee of OIML R82. I don't think it was taken seriously by most manufacturers since only a minority contributed to the committee.

ISO 17025 Accreditation bodies require performance checks of the test being accredited!. However, if you have a internal or external procedure that says calibrate the GC oven, then do it - or have a documented reason why not. But otherise there should be no need to insert such a requirement. I was a ISO 17025 quality manager for 5 years and I never had this in my SOPs. Refrigerators for reagent/sample storage - yes, GCs no.