A) Sampled gas suction
B) Mounting stubs with single flange
C) Heated gas suction pipe
1) Sampled gas input
2) Test gas input
3) Pre-filter or balance filter
4) Sampled gas pump
5) Flow regulator
6) Flow-through meter
7) Flow monitor
8) Heating element
9) Catalyser chamber
10) Comparison measurement
11) Measurement point
12) Reaction chamber
13) Measurement amplifier
14) Limit value monitor 1 – 4
15) Measured value integrator
16) Line plotter
17) Concentration indicator
18) Heating element sleeve
19) Temperature controller
20) Resistance thermometer
21) Gas output