Diagnostics - GE akta start Maintenance Manual

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5 Service and settings
5.4 UV Monitor

5.4.2 Diagnostics

5.4.2
Diagnostics
Description
Diagnostics is used to conduct a Dark current test and/or a Stray light test to assess
any electrical noise or presence of stray light.
Test
Dark current test
Stray light test
Check for electrical noise
Follow the instructions below to perform a Dark current test.
Step
1
2
66
Description
Switches off the UV LED during the test.
The test result is presented as Pass if the Signal re-
sponse has a value of max 50 mV.
Checks the absorbance when the UV flow cell is filled
with 15% acetone.
Absorbance (Abs) should have a value > 2000 mAU.
Action
Make sure that:
The UV flow cell is assembled tightly.
The inlet and the outlet tubing, and connectors are tightened to block
any stray light from entering.
The system is not exposed to direct sunlight.
Flush and fill the UV flow cell with demineralized water using a syringe. Make
sure that there are no air bubbles in the syringe.
ÄKTA start Maintenance Manual 29-0603-08 AC

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