BUCHI KjelDigester K-449 - Manual (Page 40)

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6 Operation
KjelDigester K-446/K-449 Operation Manual
CAUTION
Risk of burns from hot rack handles!
Minor or moderate burns can result.
1. Wear protective gloves when lifting the rack. Rack handles can exceed tem-
peratures of 70 °C.
11. Place the rack in the cooling position when the digestion is finished.
∙A beep sound is audible for 10 seconds to inform the user about the finished digestion.
∙The message [FINISH] appears on the display.
12. Wait until the samples are cooled down.
∙The LED [HEAT] flashes until the temperature of the heating block is below 60 °C.
13. Tilt up the suction module when no more fumes are escaping from the sample tubes.
14. Place the drip tray between the suction module and the samples.
15. Switch off the Scrubber (if connected) by pressing the stop [STOP] button.
6.8 KjelDigester K-449
6.8.1 Digestion process, manual mode
a Preliminary tasks
1. Turn on the main switch.
2. Select the method number 0.
3. Set the desired temperature and time.
∙6.3 Set parameters for manual digestion, (6–36)
4. Press the start [START] button.
∙The preheating of the heating block starts.
∙When the set temperature is reached ready [READY] appears on the display.
b Tasks
1. Place the sample tubes into the rack.
2. Pour the samples and reagents into the sample tubes.
3. Use glass caps for any unoccupied positions to close the suction circuit.
4. Fit the sample rack into the cooling position.
5. Remove the drip tray.
6. Tilt down the suction module onto the sample tubes.
7. Check if all the sealings of the suction module are fitting the sample tubes.