Hach-Lange TENSETTE plus User Manual - Handbuch (Seite 20)

Operation
20
4.3.1 Reverse technique
The reverse technique is suitable for dispensing liquids that have a
high viscosity or a tendency to foam easily. The technique is also
recommended for dispensing very small volumes.
1. Fill a clean reagent reservoir with the liquid to be dispensed.
2. Dip the tip under the surface of the liquid and press the trigger.
This action will fill the tip.
3. Withdraw the tip from the liquid touching it against the edge of
the reservoir to remove excess liquid.
4. Deliver the preset volume by shortly pressing the trigger.
Some liquid will remain in the tip and this should not be included
in the delivery. BLOWOUT is displayed.
5. To empty the tip, press the trigger again.
Change the tip and continue pipetting.
4.3.2 Repetitive technique
The repetitive technique offers a rapid and simple procedure for
repeated delivery of the same volume. Fill a clean reagent reservoir
with the liquid to be dispensed.
1. Dip the tip under the surface of the liquid and press the trigger.
This action will fill the tip.
2. Withdraw the tip from the liquid touching it against the edge of
the reservoir to remove excess liquid.
3. Deliver the preset volume by pressing and holding the trigger
down. Some liquid will remain in the tip and this should not be
included in the delivery.
4. Dip the tip again to reagent reservoir and release the trigger. This
action will fill the tip again.
5. Continue pipetting by repeating steps 3 and 4.
6. To empty the tip completely, dispense by shortly pressing the
trigger. Some liquid will remain in the tip and this should not be
included in the delivery. BLOWOUT is displayed.
7. To empty the tip completely, press the trigger again.
Change the tip and continue pipetting.