GC Agilent 7890B-TCD -PDHID-FID

I have proposed system from agilent 7890B to check high purity gases  . system consists of TCD , PDHID and FID . me question is do you think that system is complicated and i have risk that if any fault happened the whole system will be down . How to guard PDHID from dirty gases how to take care of that detector.


Please see attached DRAWING

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