Buchi Alltech 3300 ELSD - 6.2.4 Optics Heating Test

BÜCHI Labortechnik AG
www.buchi.com
23
4. The test takes 60 seconds to complete and a timer bar
appears indicating how much time is remaining on the
test.
5. The following steps occur during the test:
•
The laser is turned off and the detector is allowed to
stabilize at Gain 1.
•
Minimum, maximum, and average signal data are
collected for laser off.
•
The laser is turned on and the detector is allowed to
stabilize.
•
Minimum, maximum, and average signal data are
recorded for laser on.
•
The offset between laser on and laser off, and the
amount of variation in laser signal are determined.
•
Test results are displayed.
6. Passing requirements for the Optics Test are:
•
Laser on/off offset must be between 0.5 – 80mV
•
Laser off stability must be within 1.5mV
•
Laser on stability must be within 1.5mV.
7. Once the test is completed, press Done to return to the
main screen, or press Test to repeat the test.
8. If the test has failed, refer to the following table, Optics
Test Results, for possible fail messages and their
solutions.
OPTICS TEST RESULTS
RESULT
CAUSE
SOLUTION
Fail: Noise level
at laser off is too
high.
Electronics error.
Contact your local BUCHI
Customer Service office
which can be found on
www.buchi.com.
Fail: Offset
between laser
on and laser off
is too high.
Optics need
cleaning.
Electronics error.
Clean optics. Refer
to Section 5.4 for
details.
Contact your local BUCHI
Customer Service office
which can be found on
www.buchi.com.
Fail: Offset
between laser
on and laser off
is too low.
Laser or other
electronics error.
Contact your local BUCHI
Customer Service office
which can be found on
www.buchi.com.
Fail: Noise level
at laser on is too
high.
Optics need
cleaning.
Electronics error.
Clean optics. Refer
to Section 5.4 for
details.
Contact your local BUCHI
Customer Service office
which can be found on
www.buchi.com.
6.2.4 OPTICS HEATING TEST
1. The detector must be in Run mode and the heaters
equilibrated before the Optics Heating Test is run.
2. In the software, go to Maintenance/Tests/Optics Heating
Test and press Enter. The testing screen will then
appear:
3. Press Test to run the Optics Heating Test. The test takes
1 second to complete. The results screen will then
appear.
4. Pass requirements for the test are:
•
Optics Block must be 90% (+/-2%) of the Drift Tube
Temperature set point.