Fig. 4 Gas flow plan
Pressure regulator unit, instrument air
Cell
Zero gas, purge air, interferometer (3±0.2 bar)
Sampling probe
Ejector induction air (2.5 - 4 bar)
Control (5 - 7 bar)
Backflush (5 - 7 bar)
Sample gas
Sample gas (option)
Span gases (approx. 2 bar)
Sample gas
outlet
Span gas feed
to probe
(option)
FID fuel gas (option) (3±0.2 bar)
FID catalyzer
(option)
FID
(option)
FID combustion air (option) (3±0.2 bar)