Our Agilent Technologies 7697A Headspace sampling gas chromatographer is currently reading less than 100ppm CO2 on samples of ambient air and of headspace mineral oil samples of >1000ppm CO2. We have an FID and a methaniser for measuring CO and CO2 accu

Hi all, thank you very much for your responses and sorry for the delay in replying. It was in fact a valve switching issue. Our catalsyst had become poisoned and the part needed repaired. As a result of this rework the timings had to be adjusted. Unfortunately our gc expert left the company and we were resolving the issues relatively blind to the process. But got there in the end. Thanks again for the help.

Hi all, thank you very much for your responses and sorry for the delay in replying. It was in fact a valve switching issue. Our catalsyst had become poisoned and the part needed repaired. As a result of this rework the timings had to be adjusted. Unfortunately our gc expert left the company and we were resolving the issues relatively blind to the process. But got there in the end. Thanks again for the help.