Maintaining the 1525 Pump
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4
•
If the rod does not snap back easily, the head is misaligned. Stop the pump,
loosen the pump head, then repeat steps 8 and 9.
•
If the rod snaps back easily, click the
Stop Flow
button to stop the pump.
Continue with step 11.
11. Use the 1/2-inch adjustable wrench to hold the check valve housings in place.
Reconnect the inlet and outlet tubing assemblies to the pump head. Tighten the
tubings using the 5/16-inch open-end wrench.
12. Prime the pump as described in
. If you notice leaks, verify
pump head and plunger seal installation as described in
4.6 Replacing 1525EF Check Valves
This section describes how to replace inlet and outlet check valves for the 1525EF Pump.
Replace the inlet and outlet check valves every 6 months, or more frequently if required by
your application. Waters recommends keeping a spare set of new check valves on hand.
Note:
Each check valve and check valve housing for the 1525EF Pump must be replaced
as a single unit. Do not separate the check valve from the housing.
Required Materials
•
5/16-inch open-end wrench (in Startup Kit)
•
1/2-inch adjustable wrench (in Startup Kit)
•
Priming syringe (in Startup Kit)
•
Replacement check valves (assembled with housings)
•
HPLC-grade methanol
•
Forceps
Replacing the Inlet Check Valve
1.
Purge the pump with methanol. If methanol is not miscible with your current eluent,
use an intermediate eluent.
2.
Hold the inlet check valve housing with the 1/2-inch adjustable wrench. Use the
5/16-inch open-end wrench to loosen the compression screw and remove the tubing
assembly from the check valve housing.
3.
Use the 1/2-inch adjustable wrench to remove the entire check valve assembly from
the pump head.
STOP
Attention:
Before starting this procedure, move the eluent reservoir below the pump
head level. This eliminates gravity flow of the eluent.
Summary of Contents for 1525EF
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