No H2S detection in NGA Analyzer

Could you provide more information regarding the columns so that i can identify them on the flow chart?
Which columns are C1/2/3/4/5 ?

Also, do any other peaks still show up on the TCD? did the retention times shift  in the last months? if so, i suggest reconditioning the 13x column. its a common problem.

Could you provide more information regarding the columns so that i can identify them on the flow chart?
Which columns are C1/2/3/4/5 ?

Also, do any other peaks still show up on the TCD? did the retention times shift  in the last months? if so, i suggest reconditioning the 13x column. its a common problem.

CO2, C2, H2S are on Hayesep Q, AIr and C1 on 13X column. A large peak appear in TCD sometimes after C1 elution in Molsieve if we extend the run.Didnt notice any RT shift

Sorry you didnt get my question - im trying to understand the flowchart and after that, the switching times.

CO2/CO/H2S/N2/O2/Methane usually are appear on the TCD, correct.

I see Column 1 going to a - what i assume is a Deans switch system (Valve3) - switching between Column 2 and Column 3.

Can you check which Column is Column 1, 2 and 3?