BUCHI Wet Digester B-440 - Manual (Page 25)

6 Operation
25 B-440 Operation Manual, Version D
NOTE
Do not use coated tongs! Most coatings will melt at contact with hot crucibles! Close unused posi-
tions with empty crucibles for evenly heat distribution and to reach high temperatures!
Starting an application
Activate the fume hood. s
Use the crucible tongs to insert the crucibles into the openings of the ceramic plate. s
Close the glass hood and check all suction hoses and connections for proper seating. s
Switch "ON" the Wet Digester. s
๓ If connected to the rear side power socket of the Wet Digester, the Scrubber starts up simulta-
neously. If not, switch "OFF" the digester and check the power cord of the Scrubber. The power
switch of the Scrubber must be in "ON" position!
OR
If the Scrubber is not connected to the power socket at the Wet Digester rear side, switch "ON" s
the Scrubber manually!
Select a "PROGRAM". If necessary, adjust the digestion parameters (see section 6.3). s
Press the "START / CONT." button to start the digestion. A green light at the button indicates an s
active digestion.
๗The "STEP" display shows the actual step level.
๗The "TIME" display shows the actual digestion duration as a total of all programmed
"STEP"- times in minutes. A fl ashing dot indicates the active countdown.
๗The "TEMP [°C]" display shows the actual digestion temperature.
Pausing or aborting an application
To pause an active application press the "STOP" button once. The countdown indicator in the "TIME"
display and the green light of the "START / CONT." will fl ash simultaneously.
Press the "START / CONT." button to continue the application process. s
Press the "STOP" button again to abort the application and to reset the timer countdown. s
6.5 Finishing an application
Due to high process temperatures there is a risk of burns by hot surfaces. Do not touch any hot
surface (e.g. glass hood, vitrifi ed ceramic plate and crucibles) without appropriate safety measures!
If consistent with the application in process, it is recommended to let the Wet Digester and the
samples cool down below 40 °C (safe temperature range) fi rst.
The fume hood must be active to withdraw any fumes that might escape when opening the glass
hood.
! WARNING
Risk of dangerous or moderate burns when handling hot parts and sample tubes.
Do not touch any hot parts s
Use the handle to lift the glass hood s
Use a tongs to handle the crucibles s