Optical Emission Spectrometer Calibration to a National or International Standard

Timothy1

Involved In Discussions
#1
I am working with a Melt shop to get their ISO 9001 certification. Their instrument supplier provide them a six monthly inspection report of their optical emission spectrometer, where they use a British standard to check the drift & make adjustment. But they provide only an inspection report & not a calibration report. I am not convinced this will be acceptable to the ISO certification body. Appreciate if you can help in clarifying whether an optical emission spectrometer can be calibrated? whether the above practice by the instrument supplier can be accepted as a calibration? Thanks in advance.
 
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Kevin H

#2
Re: Can an optical emission spectrometer be calibrated to national/ International std

Timothy, they should be using more than just drift correction standards. Certified standards are available from a number of sources depending on the material/materials being melted. (Some more info regarding that would be helpful - steel/cobalt alloys/nickel alloys/copper alloys/aluminum alloys/?) Sources include NIST, Brammer Standards, Analytical Reference Materials Inc., (all 3 in the US) MBH Analytical in Great Britain and the Bureau of Analyzed Samples Ltd. also in Great Britain.

We run both OES and XRF spectrometers analyzing various steels, cobalt alloys, nickel alloys, monels and copper alloys. Most of the non iron based alloys run on the XRF, as well as iron powder mixes. Most of the steels run on the optical emission spectrometers. We used certified reference materials to set up the curves on the XRF spectrometer, and check it regularly with them for drift. With the OE spectrometers, we have the drift standards from the supplier (Thermo-Fisher) that we check and use to update, but we also do a lot of type standardization for individual alloys using a certified reference material - for example, we have a separate type standardization curve for 17-4 PH stainless steel, one for M-2 tool steel, etc.

We are registered to both ISO-9001 and ISO/TS 16949. Hope the above information helps.
 
R

Raymond_LeChew

#5
New to this forum. Read with interest Optical emission spectrometer calibration. Have more than 30 years ARL OES (install / trainings / service / calibtation. Sad to say that there is no regulated procedure to calibrate to a national or international standard. OES perform analysis based on a relative mode of measurements and results can ONLY be as good as certified standards that were used in the initial calibrations. Another issue that is of concern is the use of Type standard mode of analysis. This is strictly for final product analysis because it use only a single point correction. When used during inital charge / ladle correction, the results can be disastrous. If instrument cannot reproduce certified values of CRM standards, it has not been setup or calibrated properly.
 
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