Trouble Shooting
100 03-11-24 1012en01
The lamp voltage is usually ca. 4.5 Volts and the photometer output ca. 3.5 volts.
These values are not critical as long as the photometer output voltage is between
3.2 and 3.8 volts.
If the photometer output voltage is lower than 2.5 volt, a “LO” indication will
follow on the HGB parameter value.
An automatic adjustment will be performed when digit [1] is pressed on the key-
board.
The system will measure the offset, blank and automatically adjust the lamp volt-
age to obtain a correct reference. This procedure takes ca. 5 minutes.
14.4 HGB Value Flagged with HI
The 'HI' indication means that the blank reference voltage in the HGB system is
out of range. (The reference voltage is > 3.8 Volts).
See HGB Value Flagged with LO on page 99 how to correct this warning.
14.5 HGB Value Flagged with OF
This flag is caused by a wrong offset voltage in the HGB system.
During an exit from the stand-by mode the HGB offset is measured. If the offset
value exceeds 1.0 Volt or if this voltage is < 0.02 Volt, this error mark will be dis-
played.
Cause might be:
1. Heavy stray light in the photometer system.
2. Electronic failure.
3. Mains supply disturbance.
The most common failure is that condensation has occurred in the instrument
due to transport or heavy variations in the laboratory temperature combined with
a high humidity environment. Let the system warm up for at least 1 hour in
Stand-by mode.
14.6 High Background PLT
High PLT backgrounds are usually found at installation only. Due to transport
and having the instrument exposed to the outside air; it is occasionally necessary
to make excessive 'blanks' to get the PLT background below 10. Please note that
the longer the instrument is in use, the lower the PLT background.
If the instrument has been used for a long period of time, a high PLT background
might be caused by bacterial growth in the Diluent container. Diluent containers
should be stored at temperatures as indicated on the Diluent container label(s)
A recommended check to trace the background problem:
1. Replace the diluent container with an unopened fresh vial.
2. Perform a “Fill system” from menu 8.2 at least 2 times.
Select the “Noise Test” from menu 6.6 to check if any external disturbance is
present. All displayed figures (AMPL and FREQ) must be zero. If these values
are zero, there is NO line disturbance of any significance and high PLT blank
counts are most probably caused by the Diluent.
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