User Manual

6 Operation
72 B-90 Operation Manual, Version B
6.7 End of spray drying process
!
Caution
Risk of minor or moderate burning when handling hot parts.
• Do not touch hot parts
• Let the system cool down for some minutes after use
Finish a spray drying process
1. Switch off the heater by pressing the “Heat” button and let the system cool down. Depending on
the environmental temperature, this may take several minutes.
2. Switch off the spray head by pressing the “Spray” button.
3. Stop the gas flow at an inlet temperature below 70 °C.
4. Read the internal pressure of the Nano Spray Dryer B-90. No overpressure should be present.
5. Take out the pump inlet tube of the sample solution. The pump will now transport air, displacing
product deposits in the tubing and spray head. Turn OFF the peristaltic pump afterwards and
lower the pump bed to release the mechanical load of the pulleys at the tube.
6. See section 6.8 before open the glass assembly in safe environment prior to any particle
recovery!
6.8 Collecting the particles from the collector cylinder
!
Danger
Death or serious poisoning by inhalation or incorporation of dried particles at recovery.
• Wear safety goggles
• Wear safety gloves
• Wear a suitable protective mask
• Wear a laboratory coat
• Do not inhale dried particles
• Stop drying gas flow before opening the drying circuit
• Only recover particles in sufficiently ventilated flue or glove-box
• Do not disperse the dried particles
• Do not clean dusty parts with compressed air
General information about particle recovery
To recover the particles from the wall of the collecting electrode a particle scraper and collecting
paper can be used. It allows recovering the particles manually and deposits the particles on a sheet of
weighing paper.