3 | Product description BÜCHI Labortechnik AG
10/34 Operation Manual Ultrasonic Package
3 Product description
3.1 Description of function
The ultrasonic nozzle with the ultrasonic controller are built to be used as liquid atom-
izer in the spray drying process with the Mini Spray Dryer B-290 and its subsystems.
An ultrasonic atomizing nozzle is a device that vibrates at frequencies beyond human
hearing (>20 kHz). The vibration on the atomizing surface of the nozzle produces a
low velocity spray by breaking up a liquid feed into a spray of droplets. This phenome-
non is the result of the decay of an unstable capillary wave that develops in the liquid.
The spray velocity is typically low with 18-36 cm/s as compared to 10-20 m/s for pres-
sure atomizing nozzles. The ultrasonic controller provides the high frequency electri-
cal energy required to operate the ultrasonic atomizer nozzle.
Three modes are available:
Mode Solvent composition
Open mode up to 20 % organic solvent
Closed mode with
B-295
between 80 % - 100 % organic solvent
Closed mode with
B-295 and B-296
between 20 % - 80 % organic solvent
3.2 Configuration
3.2.1 Front view ultrasonic controller
Fig.2: Front view
1 On/Off master switch 2 Display
3 Navigation control 4 LED
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