6-3
Matec Applied Sciences
56 Hudson St., Northborough, MA 01532 Ph: (508) 393-0155 Fax: (508) 393-5476
www.matec.com
e-mail: [email protected]
6.1.1 Replacing the Plunger Seals
The two plungers in each pump are ultra-smooth, chemically inert sapphire rods. Salt crystals can
form on a plunger and cause wear on the plunger seals and on the plunger itself.
Small pieces of a worn plunger seal may get caught in the outlet check valve of the pump head. If
the plunger seals are worn, you may have to inspect and replace the outlet check valve. To replace
an outlet check valve, see Section 6.1.3, Cleaning and Replacing the Check Valves.
Required Materials
•
5 mL syringe
•
5/16-inch open-end wrench
•
5/32-inch Allen wrench
•
Brass machine screw
•
Replacement seals and washers
To Replace a Plunger Seal:
1.
Insert a syringe into the priming valve for the pump (see Figure 4-6).
2.
Open the priming valve.
3.
Place the eluant reservoir below the level of the eluant inlet tube. Remove the inlet line
from the inlet tee of the pump and allow the eluant to drain back into the reservoir.
4.
Set the Priming Flow Rate parameter to 0.5 mL/min (refer to Section 3.3, Reviewing and
Editing Operating Parameters).
5.
Use the Prime Pump option to turn on the pump (refer to Section 4.2, Priming the Pumps).
6.
Use the syringe to extract as much eluant as possible from the pump.
7.
Use the Prime Pump option to stop the pump when the indicator rod is retracted into the
pump head (this protects the plunger from breaking under the weight of the pump head).
8.
Using the 5/16-inch open-end wrench, remove the outlet tube from the outlet check valve
of the pump head (see Figure 6-1).
9.
Remove the inlet tube from the inlet check valve (see Figure 6-1).
10.
Using a 5/32-inch Allen wrench, remove the two pump-head-assembly mounting bolts
(Figure 6-2).
Figure 6-2 Unscrewing the Pump Head
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