Foss Infratec 1241, Service Manual

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Infratec™ 1241 Grain Analyzer
Service Manual 1001 5015 / Rev. 4 4:35
4.11.8 Error 33292, Reference Scan too low
During Start up Test or before analyse the lamp intensity is checked by setting the
Detector Gain to 1*1 and performing a scan. The received value from the Detector
should be more than 15000 bits. If not, this error will be displayed. The operator will
be instructed to check the lamp and clean the Sample Cell.
If the problem is not solved by these actions the following should be done:
Enter the Service Menu, go to Manual tests/ Detector. Set the Gain to 1*1 and per-
form a scan to confirm that the received value over 15000 bits. If the received value
is around 400 this means that there is no light at all reaching the Detector. Check the
Monochromator Shutter from the Service Menu. Confirm that the Shutter is open. If
not, try to open it by changing its position from the Service Menu.
4.11.9 Error 33293, Too few valid Sub samples collected
In the Application Models there are settings for maximum and minimum absorbance
and also a "number of required sub samples". Sub samples that are outside the ab-
sorbance limits are not included in the predictions and if fewer than "number of re-
quired sub samples" remain, the warning "Too few valid sub samples" will appear.
• Low absorbance: Pinhole problems or path length too narrow.
• High absorbance: Dark sample, foreign materials, path length too wide.
4.11.10Error 33294, Monochromator Shutter not able to
move
The shutter has three positions: Closed, Open and internal BG 20 filter. If the Shutter
position does not respond when a command is sent to change the position, then error
33294 will appear. The Shutter can be set manually from the Service Menu (Manual
Tests/ Monochromator). If this solves the problem the instrument should be re-ana-
lysed to make sure that it was a temporary problem. If however the message appears
again you should then replace the Monochromator.