Chemiluminescent Nitrogen detectors

Does anyone here have any real-time, practical experience with the use of
chemiluminescent nitrogen detectors?  I am particularly interested in how
accurate their touted quantitative capabilities are.

I would like to sample from an LC stream (water/methanol/TFA), which would
in theory contain a single component of known molecular formula.  How
accurately could I estimate the concentration of my sample?

In addition, what sort of upkeep/maintenance/consumables are required? Can
the device simply be turned on when required and expected to perform
robustly, or would it be better to keep in on 24/7?  How much O2 does it
consume? etc..

As I said,  while pitches from vendors are welcome, I am very interested in
hearing from real-world users.

Thank you.

Bizz