Buchi Scrubber K-415, Operation Manual, Page: 45 / 58

7 Maintenance and repairs
44
K-415 Operation Manual, Version B
7 .6 Washing solution
Used washing solutions may impair the functionality of the Scrubber K-415 especially in the range of
the neutra lization point as a result of strong foaming. Changing the washing solution in appropriate
time (when the color indicator undergoes a color change) keeps the adsorption stage and/or reaction
stage from getting soiled and pre vents the possibility of the pump getting damaged. For a discription
of how to prepare and fill up the washing solution, see chapters 5.9 and 5.10.
NOTE
Make sure to dispose of the used washing solution according to your laboratory guidelines.
7 .7 Active charcoal
Exchange the active charcoal as soon as it clumps together or white crystals or other residues
become visible.
7 .8 Pump
Flush the pump once a week or after hard use.
To flush the pump, proceed as follows:
• Close the bypass valve
a
completely (for maximum suction power).
• Disconnect the suction hose
d
from the absorption vessel and put it into a suitable vessel
c
with
at least 500 mL of distilled water.
• Disconnect the silencer and remove it.
NOTICE
Risk of a water leakage and power failure.
• Do not pull on the pump output hose.
• Place a suitable vessel
b
on the pump output.
• Switch on the device and collect the waste water from the pump.
• Flush the pump until the collected waste water is clear