WPI NANOLITER2020, Инструкция по эксплуатации

Страница: 28 / 44

24 World Precision Instruments
MAINTENANCE
Replacing O-Rings
After a period of time, you may observe some leakage around the seals. To correct this,
replace the O-rings. Replacement O-rings are included with your NANOLITER2020 .
Additional O-rings (WPI # 300746 ) may also be ordered. Fig. 44 shows the proper installation
configurations. Correct orientation of the O-rings is critical for proper operation.
1. Unscrew the collet and slide the collet assembly off of the wire plunger. Unscrew the
aluminum barrel from the Nanoliter injector. The O-ring should slide easily from the
collet.
2. When you slide the barrel over the plunger without the collet assembly, the
sealing O-ring (black) and the plastic sleeve (white) should come off. If not, use a
small pair of curved forceps to scoop them out of the end of the barrel. DO NOT
bend the plunger.
3. Discard the old O-rings. Slide the sealing O-ring (black disc shape gasket) on the
plunger first with the large hole facing towards the barrel of the pump and the smaller
hole facing toward the micropipette.
4. Then, slide the white plastic sleeve ( spacer) on the plunger with the flat surface side
facing towards the barrel of the pump and the and concave surface facing towards
the micropipette.
Fig. 43—Install the O-rings on the plunger. To reassemble the unit, slide the barrel over the
wire plunger and screw it in place on the injector.
5. Install the appropriate O-ring on a fresh micropipette and screw the collet in
place. See “Setting up the Injector” on page 9.
Sealing O-ring
The conical hole in the center points forward.
This seal must have tension or it could leak.
Aluminum Barrel
Plunger
Plastic Sleeve (spacer)
placed between “O” rings
with indentation toward glass
Front Gasket
Collet
Glass
Push the glass in, then tighten the collet.
The end of the glass must seat firmly in the
gasket here, or it may leak.
Fig. 44—The front gasket can be installed in either direction.
NOTE : It is essential that these components (O-ring/gaskets) be installed in the
correct orientation to hold the glass micropipette in place and proper functionality of
NANOLITER2020 Injector.