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TCD filament for corrosive gas analysis

Posted: Wed Jun 10, 2020 5:46 am
by Mreza555
Hi
There is a question about corrosion of TCD filament with a gas containing 30% H2S. the GC system is a RGA and there are four H2S-rich samples per week. is the typical tungsten filament suitable for this system? or it requires another filaments like nickel or Gold coated ones?

Thanks

Re: TCD filament for corrosive gas analysis

Posted: Thu Jun 11, 2020 1:37 pm
by antonk
This table states - they should be gold-plated W
https://agc-instruments.com/product/the ... filaments/

or Pt-Rh or something from precious metals