Replacement Of Discharge Tube/Valves - VITLAB Dispenser TA2 Mode D'emploi

14. Replacement of discharge tube/valves

Warning!
The valve, telescoping filling tube and dispensing tube are full
of reagent! For this reason, always perform a standard cleaning
before dismantling the instrument. The dispensing unit must not
be disassembled! Follow the safety instructions (page 28)!
14.1 Replacing the discharge tube
1. Instruments with a recirculating valve should be set to 'Recircu-
late', and the valve lever pulled upwards to remove (Fig. 1).
2. Slide the discharge tube housing all the way up. Then pull the
discharge tube forward with gentle up and down motions
(Fig. 2).
3. Hold coupling piece of the new discharge tube and pull housing
up. Push housing into the valve block until it meets the stop.
4. Slide the discharge tube housing all the way down.
5. For instruments with a recirculation valve, pull up the valve lever
to the 'Recirculate' position, and press it in tightly (Fig. 3).
14.2 Replacing valves
Filling valve
1. Pull out the recirculation tube and the telescoping filling tube.
2. Use the mounting tool to unscrew the filling valve (Fig. 4).
3. Screw in the cleaned (e.g., in an ultrasonic bath) or new filling
valve first by hand and then tighten it with the mounting tool.
Note:
If the instrument does not fill up, and if some elastic resistance is
evident when the piston is pulled upward, then it is possible that
the ball valve is merely stuck.
In this case, loosen the ball valve using light pressure, for example,
with a 200 µl plastic pipette tip (Fig. 5).
1
2
3
4
5
43