Instruction Manual

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).