Thermo Scientific Multidrop Combi nL, User Manual

Page: 73 / 106

Maintenance
Regular and preventive maintenance
Thermo Fisher Scientific Thermo Scientific Multidrop Combi nL User Manual 73
2. Rinse the tubings with distilled and filtered laboratory-grade water
always after using the instrument.
Warning
Before a prolonged standby, run the tubings dry to avoid
microbial growth from developing.
s
To routinely remove, for example, persistent air bubbles from the
hosing and microsolenoid dispensing valves, use tip washing. The tip
washing is started by pressing the
TIP WASH
button. A sequence of
operations is carried out to remove the debris or air bubbles. The liquid
comes in pulses and one liquid channel at a time to maintain a
maximum flow through the dispensing valve.
To routinely clean the tubes and microsolenoid dispensing valves, use
emptying. The emptying is started by pressing the
EMPTY
button. The
EMPTY
button is also used for emptying the remaining liquid from the
tubings and dispensing valves (backflush option).
Periodic maintenance constitutes, for example, cleaning a leaking or
clogged dispensing valve, replacing a dispensing valve or replacing a
tubing set and a manifold. The procedures are all explained in detail
below.
Foreign particles can cause leakage of a dispensing valve (tip)
(Figure 4–16 and Figure 5–30). A dispensing valve leaks when a droplet
forms on the end of the dispensing valve while the pressure is on.
To clean a leaking dispensing valve:
1. Press the
TIP WASH
button several times. The liquid comes in pulses
and one channel at a time to maintain a maximum flow through the
dispensing valve.
2. However, if the dispensing valve is still leaking, try the following
backflush procedure :
l
Empty the reagent reservoir or fit an empty reagent reservoir and
remove the reagent filter and the tube from inside the cap of the
reagent reservoir (Figure 5–27).
Tip washing
Emptying
Periodic maintenance
How to clean a leaking
dispensing valve