6 Operation
37 K-425 / K-436 Operation Manual, Version B
6.5 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! See following
illustration of cooling positions.
Metal surfaces of the rack and the SpeedDigester might be hot!
➥ 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 a side position of the SpeedDigester or
➥ use the black handles at the rack to safely position a single rack in the cooling chamber of the
SpeedDigester K-425 (rack cools down significantly faster than inside the heating chamber).
• Let the rack(s) cool down below 40 °C first, then switch off the Scrubber or water jet pump.
• Carefully remove the suction module(s) 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 and lift off the complete
rack(s) including the suction module(s)
• To take the sample tubes off its rack, proceed section 6.2.3 and 6.2.4 (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).
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