2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
1.5-1
1.5
1.5
Analysis time too long
The instrument stops the analysis automatically, once the peaks of all activated ranges
have descended to the comparator level, ( see drawing below ).
The comparator level is an artificial zero level which can be adjusted and it is normally just
above the baseline.
If after a preset time, the signal stays higher than the comparator level, the analyser stops
and calculates the result. But this result may be inaccurate, because the peak wasn't
completely recorded.
With
you enter the menu for setting the comparator level.
The standard values for sensitive channels are 250 to 300 for the "low channel",
and 50 to 100 for the "high channel".
Before increasing the values check the following:
Thermostabilisation
Flow rates
Blank value ( a large blank value is a sign for a physical or chemical fault )
Check for gas leakage.
If above functions are OK, it is possible to increase the comparator level by 100 units.
time
Comp ara tor le vel
St op
IR ou tpu t
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