6-10
Matec Applied Sciences
56 Hudson St., Northborough, MA 01532 Ph: (508) 393-0155 Fax: (508) 393-5476
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e-mail: [email protected]
5.
Being careful not to scratch the inside of the pump head, use the dentist’s pick to pry the
old gasket and outlet check valve seal out of the pump head. Note the orientation of the
gasket.
6.
Orient the new gasket in the same direction as the old gasket. Press the new seal and gasket
into place with the end of the blunt tool.
7.
Screw the check valve into the upside-down pump head until finger-tight. Use the wrench
to tighten the check valve another 1/8-turn.
8.
Install the pump head as in Section 6.1.1, Replacing the Plunger Seals.
9.
Reconnect the eluant line.
6.1.4 Replacing the In-Line Filter
Replace the in-line filter when the system experiences high back pressure.
Caution: To avoid chemical and electrical hazards, always wear safety glasses, turn off the
instrument power, and disconnect the power cord before you perform this procedure.
Required materials
•
Two 5/8-inch open-end wrenches
•
One 5/16-inch wrench
•
New filter insert (from start-up kit)
To replace the in-line filter:
1.
Reduce the pump flow rate to 0 mL/min.
2.
Hold the in-line filter on the front of Pump A with a 5/8-inch wrench while you disconnect
the two compression screws with a 5/16-inch wrench.
3.
Disassemble the in-line filter using the two 5/8-inch wrenches.
4.
Wash the in-line filter housing with methanol.
5.
Assemble the in-line filter with a new filter insert (Figure 6-9).
Figure 6-9 Assembling the In-Line Filter
6.
Re-attach the assembled in-line filter at the front of the pump.
7.
Reconnect the power cord, then turn on instrument power.
8.
Inspect the in-line filter for leaks. Tighten 1/4 turn (if necessary).
9.
Precondition the in-line filter by running methanol through it at 1.0 mL/min for
approximately 15 minutes.
Filter insert
To inlet
compression
fitting
To outlet
compression
fitting
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