BUCHI Inert Loop B-295 - Manual (Page 59)

7 Maintenance and repairs
59 B-290 Operation Manual, Version I
7 .4 Aspirator cleaning
The aspirator of the Mini Spray Dryers can be contaminated from particles, especially when no outlet
filter is used. This is a description how to clean the aspirator efficiently and fast.
Disconnect the “Polypress” tube from the
glass assembly and heater respectively.
Fig. 7.1: Disconnecting Polypress tube
• Fill one vessel with water and prepare an empty canister with a small opening.
• Insert the exhaust tube from the aspirator into one third of the empty canister and fix the tube.
• Set the aspirator to 50 % and switch it on. Carefully move the inlet tube over the surface of the
water to suck in a mixture of air and water.
• Do not immerse the tube into the water. Be aware that no splashes are contaminating the ambient
at the outlet side.
• Increase the aspirator rate up to 80 %, continue to draw water through the aspirator. Be careful,
that the exhaust tube in the receiving tank remains in the air to prevent splashes.
• Continue this procedure unless clean water is coming out of the aspirator.
• Let the aspirator run for approximately 1 hour to dry residual water in the aspirator away.
7 .5 Inert Loop B-295 and Dehumidifier B-296
The sealed working circuits of the devices and the optional heat exchanger in combination with the
Inert Loop B-295 and Dehumidifier B-296 can be flooded completely for cleaning purpose.
Notice
Risk of instrument and instrument damage by liquids and detergents.
• Do not spill liquids over the instrument or parts of it
• Wipe off any liquids instantly
• Use ethanol or soapy water as detergent only
• Switch off all relevant devices and unplug the respective power cords.
• Remove the molecular sieve bag for the duration of cleaning if installed.
• Check all sealings and tubes for good condition and proper sealing.
• Raise the exhaust tube and fill the system through the inlet with cleaning medium (e.g. ethanol).