2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
1.7-1
1.7
1.7
Erratic results
The only way to check the repeatability, is to analyse standards. Watch the standard
deviation attested in the certificate of the standards.
Self-made standards are a cheap option to check the calibration in the user’s range.
The following faults cause erratic results :
Insufficient flow rates
Wrong or highly inconsistent blank value of the carrier gas
Damaged electrodes
Bad contact – see 1. 24
Check the electrodes and the flow rates first.
Delete the blank value as follows
Enter the channel number as required
Start analysis
To abort the blank value analysis press
Run five analyses cycles without sample, by entering 1000 mg manually.
The blank value should be 5 to 10 ppm. Otherwise see 1. 6.
Analyse a standard sample 5 times.
The standard deviation should be better than 1% or ± 3 ppm, whichever is higher.
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