Metrohm 944 Professional UV/VIS Detector Vario - Manual (Page 37)

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6 Operation and maintenance
944 Professional UV/VIS Detector Vario (2.944.0010)
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￭ The intensity spectrum has been checked and shows a cut-off (see Fig-
ure 8, page 22).
1 Starting the automatic lamp setting
￭ In MagIC Net, select the 944 UV/VIS Detector from the device
table in the Configuration program part.
￭ Click on 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 made based on a built-in algorithm. This algo-
rithm calculates and sets the optimized values for Integration dura-
tion and VIS intensity level. After the automatic adjustment, a
new intensity spectrum is displayed.
2 Saving the lamp settings
￭ Check the new intensity spectrum that is displayed and click on
[OK] to complete the lamp optimization.
The adjusted lamp values are transferred to the instrument. The dia-
log window is closed.
6.7 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. Rinse the flow-through cell with a different solvent.
3. Dismantle the flow-through cell and clean it 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.
Rinsing the flow-through cell with methanol
1 Disconnect the input capillary from the IC system.