Metrohm 909 UV Digester - Manual (Page 36)

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909 UV Digester
Starting sample digestion
1
UV
Warning
Hazardous UV radiation
UV radiation damages the eyes.
Protect your eyes from UV light during operation. Position the UV
protective shield on the front of the instrument and wear UV pro-
tective glasses.
The 909 UV Digester has to be operated in a closed fume cup-
board or in a closed laboratory and may be operated only by
trained personnel.
Press the [START / STOP] key.
The UV lamp is switched on. You can track the current temperature
and time until the end of radiating on the display.
You can top off the hydrogen peroxide (w(H
2
O
2
) = 30%, for trace
analysis) as needed during radiating. This may be necessary for sam-
ples with a larger organic load.
Note
The digestion temperature and radiating time can be modified dur-
ing the digestion process. Proceed as described in Chapter 4.2.2,
page 20 as needed.
Procedure after sample digestion
Sample digestion ends and the UV lamp is switched off automatically once
the configured radiating time elapses. The fan cools the samples for 10
min.
Proceed as follows after sample digestion:
1 Wait for the samples to cool (the fan switches off after 10 min).
2 Remove the sample holder with the samples from the wet end.