BUCHI Ultrasonic Package - Manual (Page 27)

BÜCHI Labortechnik AG Installation | 5
Ultrasonic Controller 27/46
5.4 Feed tube, selection
1. Choose a feeding tube from the table below.
NOTE
For short processes, even unsuitable tubes can be used, as swelling takes
some time.
Solvent Silicone tube Tygon ® MH 2075 Tygon ® F 4040 A
Methanol • • •
Ethanol • • •
Acetone – • –
Toluene – – –
Isopropanol • • •
Chloroform – – –
Dichlormethane – – –
Tetrahydrofuran – – –
Ethylacetate – • –
Hexane – – •
Table 1: • = suitable | – = unsuitable
5.5 Liquid feed rate, adjustment
1. Adjust the feed rate according to the following settings according to the
desired requirement:
• Possible liquid feed rate using ultrasonic nozzle 1–9 mL/min (3–30 %).
• Recommended feed rate with aqueous feeds 2.5–3.2 mL/min (8–10 %).
5.6 Cooling gas, adjustment
Adjust the flow rate of the cooling gas using the needle valve at the flow meter
of the B­290.
The temperature of the ultrasonic nozzle shall always be below 100 °C. If the
temperature of the ultrasonic nozzle rises (the temperature can be checked on
the upper display of the ultrasonic controller), the flow rate of the cooling gas
needs to be increased.