BUCHI SpeedDigester K-439 - Manual (Page 43)

6 Operation
43 K-439 Operation Manual, Version A
6 .7 .5 Starting up the SpeedDigester
System preconditions
The system must be correctly installed and fully functional. All parts must be in proper condition (e.g.
clean and free of damage). See also section 2.5 “Product safety” for general warnings!
Start-up procedure
Select and install insulation plate(s) according to the type of sample tubes. •
Install insulation caps at unused positions of the insulation plate(s) for 300 / 500 ml racks. •
Make sure the SpeedDigester K-439 is properly connected to the mains supply. •
Make sure the Scrubber B-414 is properly connected to the K-439 or to the mains supply. •
Start the ventilation of the fume hood. •
Switch on the SpeedDigester K-439 at the mains switch at the front. •
The digestion can now be started in the Automatic or in the Manual Mode of the system. •
Note
For operation with 3rd party sample tubes no insulation plates and glass caps are available. Hence,
all positions must be equipped with samples!
6 .8 Performing a Kjeldahl digestion process
This section is divided into two consecutive sub-sections (6.8.1 and 6.8.2) and follow-up actions in
section 6.10. Do not skip or mix up these steps to ensure safe handling and best performance.
Note
Application notes are available for various samples at Buchi. These notes work as digestion recipes
and give detailed instructions how to process specific sample materials. For application notes,
contact your Buchi application specialist or your local distributor.
The 20 predefined Buchi standard methods help to operate the instrument "plug and play" and as a
basis to develop your own methods.
6 .8 .1 Preparational steps
Start-up the SpeedDigester. 1.
Let the system heat up (Preheat function in Automatic mode) 2.
Prepare the sample tubes according to the type of digestion under safe conditions. 3.
➡ The samples are now ready to be digested.
6 .8 .2 Starting a digestion process
Install the rack(s) according to the chosen sample tube size. 4.
➥ Place glass caps (order no. 040049) into every unused position of the rack
➥ Place insulation caps (order no. 11056024) into every unused position at the insulation plate
➥ To securely withdraw harmful fumes, switch on the suction unit (Scrubber or water jet pump)
before inserting the racks into the instrument!
The digestion process starts, as soon as the sample tubes heat up in the instrument. 5.
➥The Scrubber must be switched on.
➥If the Scrubber is directly connected to the K-439, it will start as soon as "Step 1" of the
selected method starts and stops after the cooling-down time defined within the method is
finished.