Notice
The IR cells have normally base lines adjusted to about 8V and the peak comes down during
analysis, respectively during IR absorption by the measuring gas.
In case of golden paths, in the first couple of months after being in operation, the base line may
goes up, which means that the paths become more reflective during this period. Therefore, the
base lines of golden paths should be initially set rather at 5 or 6 volts instead of 8 volts. In the
first couple of months the base lines go up, but the growing slows down and growing
contamination finally causes the base line to start coming down.
The initial base line adjustment at 5 to 6 volts, prevents the maximum base line value from
reaching 9.5V, where the error message “Check base line” appears. Note that this message is
just a warning. The analyzer is not prevented from carrying out further analyses. As long as the
base line remains below 10V, the results are correct.
If a base line is below -9.5V, an adjustment should be done as advised above. If this is not
possible, then most probably there is a fault or a very strong contamination. See chapter 4.1 “IR
paths cleaning”. In case of contamination, all cells available should have very low voltages,
even negative ones.
If all available cells are below -9.5V there is most probably a fault that is common for all cells
like no rotating chopper motor or a faulty infrared source. See chapter 2.35 “The chopper
motor doesn’t rotate” and 3.3 “IR source voltage setting”.
See also Chapter 3.4 “Analysis takes too long / RF-interference on the IR-cell, or on the
electronic units”
Pos: 3.4 /0025 Ü berschriften/ELTR A 1.1 Übersc hriften/11 Fluc tuating gas flow E LTRA @ 6\m od_136845 2950593_9.docx @ 40051 @ 2 @ 1
3.2 Fluctuating gas flow
Pos: 3.5 /0010 ELTRA/0015 ser vice_instructions /CS-2000_ser vice/05Faults_C S-2000/05 10 Modul Fluctuati ng gas flow @ 9\mod_14255 39177355_9. docx @ 74105 @ @ 1
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