TCD decreased sensitivity and high level baseline

[mwestqub]

Hi all,
I have a thermo scientific trace 1300 GC with TCD, gas sampling valve and argon carrier gas, in order to detect, CO2, CO, CH4, H2 gases. With time, sensitivity has decreased, noise has increased and high baseline (baseline should be around 0mV and it is currently at 500mV).

We have checked for leaks, and lowered detector and filament temperatures, baked the system to remove contamination, and also trying a different column, to no avail.

When the filament is off the baseline is low, when on the baseline is very high.

Any other thoughts or suggestions to help with the baseline and sensitivity issue?

Many Thanks

[Alfonso]

Hello,

My name is Alfonso Madrigal and I work for Advanced Analytical Systems. We specifically provide laboratory support services, such as laboratory instrumentation sales and servicing, monthly maintenance plans including on-site and remote access, troubleshooting and complete instrument repairs, as well as our method development or even our custom laboratory information management systems (LIMS).

AAS specializes in servicing current and older instruments of Varian/Bruker, HP/Agilent, Shimadzu, SRI, and Antek. Our on-site services vary from weekly, monthly and yearly. Additionally, we provide exceptional operator training that improves relations between users and advanced software.

If you have any needs in regard to your laboratory, gas chromatographs, software, or any instrumentation at all, please feel free to contact me with any questions.

Thank you,

Alfonso Madrigal

P: (562) 852-6071
E: amadrigal@aasystems.com