BUCHI KjelDigester K-449 - Manual (Page 41)

6 – 41 Operation Manual KjelDigester K-446/K-449
6 Operation
WARNING
Risk of acid or toxic fume inhalation.
Serious injuries or death can result.
1. Always run the Scrubber or water jet pump during the digestion process.
2. Operate the Scrubber and KjelDigester only in a fume hood.
3. Close the fume hood door as far as possible.
8. Press the start button.
∙The rack lowers automatically into the heating block.
∙The Scrubber starts (if connected).
9. Start the Scrubber (if not connected) or the water jet pump.
10. After the digestion process the rack will move automatically into cooling position.
∙The message [FINISH] appears on the display.
∙A beep sound is audible for 10 seconds to inform the user about the finished digestion.
11. Wait until the samples are cooled down.
∙The LED [HEAT] flashes until the temperature of the heating block is below 60 °C.
12. Tilt up the suction module when no more fumes are escaping from the sample tubes.
13. Place the drip tray between the suction module and the samples.
14. Switch off the Scrubber by pressing the stop [STOP] button.
6.8.2 Digestion process, automatic mode
a Preliminary tasks
1. Turn on the main switch.
2. Select or setup a method (Method 1 – 9).
∙6.8.6 Select a method, (6–44).
∙6.8.4 Set parameters for an automatic digestion, (6–43).
3. Press the start [START] button.
∙The start time setting appears.
4. Press the start [START] button.
∙The block is heated to the set temperature of step 1.
∙The rack will lower automatically into the heating block when the temperature of step 1
is reached.
∙The Scrubber starts (if connected).
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.