BUCHI Nano Spray Dryer B-90 - Manual (Page 85)

7 Maintenance and repairs
85 B-90 Operation Manual, Version B
! Caution
Risk of minor or moderate cuts when handling damaged glass parts.
• Handle glass parts with care
• Visually inspect every glass part before mounting
• Exchange damaged glass parts immediately
• Do not touch cracks or bits of broken glass with bare hands
7.4 Oxygen sensor
The live time of the oxygen sensor in the Nano Spray Dryer B-90 Advanced or Inert Loop B-295 is
approx. 1.5 years. Replace the sensor after this period or in case of malfunction. To remove the sensor
disconnect the sensor cabling and unscrew it by turning it anticlockwise. For installation proceed in
reverse order.
7.5 Sealing conditions
All sealings are recommended to be checked yearly. When replacing the seals, take care not to
damage them.
• To prevent damaging the seals never apply grease and never touch them with sharp objects.
• To prolong the lifetime of the seals, rinse them routinely with water or ethanol and always when
there has been the possibility of unwanted sample contamination.
• Dry the cleaned seals with a soft, lint-free cloth.
7.6 Cleaning
The following subsections describe possible cleaning actions. All actions should be performed regu-
larly and thoroughly.
7.6.1 Spray head and tube connections
Clean the feed tubing and the spray head after every spray process.
• To clean the central hole of the spray head body use water.
• Rinse the spray caps routinely with water or ethanol for primary cleaning.
• Recommended: Cleaning of the spray cap mesh in an ultrasonic bath.
! 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
NOTE
For maximum throughput and to avoid cross contamination of the spray drying output it is essential
to work with a clean spray cap and tube assembly! Total cleaning of the spray caps (in particular
cleaning of the micropore meshes) needs an ultrasonic bath processing for about 10 minutes.