Hi there,

I am still puzzled about he delayed peak retention time and elevated N2 
baseline. Neither a large leak or blockage (which should cause the observed 
effects) is detectable, at least not in the components that I can test directly 
or indirectly by bypassing them (autosamples, combustion / reduction column, 
water trap, GC column, TCE detector, O2 loops, Conflo III).

While I am still searching for a solution, I would like to describe two more 
things that I haven't mentioned before. First, the flash combustion is delayed 
by about 10 sec.. Second, when I take out the He-diluter, the N2 baseline 
jumps up immidiately from 6 to 12 mV but then slowly creeps up to about 30 
to 40 mV over the duration of 200 seconds. I am not sure if these time lags 
are related to the original problem but maybe it rings a bell for someone...?

Thanks, Bjoern