Metrohm 887 Professional UV/VIS Detector - Manual (Page 39)

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887 Professional UV/VIS Detector ￭￭￭￭￭￭￭￭ 31
￭ The flow-through cell is rinsed with ultrapure water.
￭ The flow-through cell is free of air bubbles.
￭ The intensity spectrum has been checked and shows a cut-off (see
Chapter 4, page 22).
1 Starting automatic lamp setting
￭ In MagIC Net™, go to the program part Configuration and
select the 887 UV/VIS Detector from the device table.
￭ Click Edit ▶ Properties... to open the properties window.
￭ On the Detector tab, click on [Settings..] to open the detector
settings.
￭ In the detector settings, click on [Adjust automatically] to start
the automatic lamp adjustment.
The lamp settings are optimized based on a built in algorithm. This
algorithm calculates and sets the optimized values for Integration
duration and VIS intensity level. After the automatic adjustment,
a new intensity spectrum is displayed.
2 Saving the lamp settings
￭ Evaluate the new intensity spectrum and click on [OK] to com-
plete the lamp adjustments.
The adjusted values are transferred to the instrument. The dialog
window is closed.
6.6 Cleaning the flow-through cell
Depending on the application, hardly visible deposits may form on the len-
ses, which leads to higher absorption and thus increasing noise on the
baseline.
If the baseline is very noisy and the problem is not caused by other parts
of the system, the flow-through cell must be cleaned.
For the cleaning of the flow-through cell, we recommend a three step
process:
1. Rinse the flow-through cell with methanol.
2. Rinsing the flow-through cell with another solvent.
3. Dismantling and cleaning the flow-through cell manually.
Always start the cleaning process with step 1. If this does not solve the
problem, perform step 2. Perform step 3 only, if the deposits are persis-
tent.