BUCHI SpeedDigester K-439 - Manual (Page 46)

6 Operation
46 K-439 Operation Manual, Version A
6 .10 Finishing a digestion process
! WARNING
Risk of dangerous or moderate burns when handling hot parts and sample tubes.
Do not touch any hot parts •
Let the system cool down •
Cover unused positions with insulation cap(s) at the insulation plate(s) •
After the digestion process has been completed, the sample tubes must cool down!
Metal surfaces of the rack and the SpeedDigester might be hot!
➥When the Scrubber is directly connected to the SpeedDigester it is still running until the cooling-
down time is completed. Then it stops automatically.
➥ Let the rack cool down inside the heating chamber (can take more than 60 minutes!) or
(for racks with 300 ml / 250 ml tubes only) use the black handles at the rack to put one or more
racks into the cooling position of the SpeedDigester (see illustration below) as soon as the info
message "Heating finished" appears. Confirm the message by pressing OK.
If the Scrubber is not connected, let the rack(s) cool down below 40 °C first, then switch off the •
Scrubber or water jet pump.
When the info message "Digestion done" appears, confirm it with OK. The suction module(s) can
•
now be removed. Be careful to avoid acid drops.
➥ The suction modules should be safely stored e.g on a "Stand with drip tray" (order no.
11055216) to safely collect remaining acid condensate. or
➥ Unplug the suction hose connector(s) from the suction module, place them on the
magnetic bracket and lift off the complete rack(s) including the suction module(s).
To take the sample tubes off its rack, proceed with section 6.7.3 and 6.7.4 (for 500 ml sample •
tubes only) in reverse order.
! Caution
Risk of moderate chemical burns by splashing acid or peroxide drops.
Carefully unplug the suction hose connectors •
Wipe off any liquid drops from the suction hose connectors •
Carefully store the magnetic suction hose connectors on top of the bracket at the •
device rear side
Avoid fast snapping of the magnetic catch
•
Wear safety goggles •
Wear safety gloves •
➡ The digestion output can now be processed (e.g. by a Kjeldahl distillation system).