Valve Leak Test - Waters Alliance e2695 Operator's Manual

• Compression fittings and head nuts are tight.
• The appropriate solvent (methanol or water is recommended) was used.
If necessary, ensure a good seal around the plunger and head surface by flowing at high pressure
before rerunning the test. For example, install a restrictor sufficient to achieve 27579 to 31026 kPa
(4000 to 4500 psi) backpressure at a flow rate of 0.5mL/min.
Finally, repeat the static leak test.
8.4.3.3 Continued failing result
If the static leak test continues to fail, perform these actions:
1. Ensure that the degasser is set to On.
2. Perform a wet prime for 10 minutes, at 1.0 mL/min, using methanol and an in-line restrictor
to achieve 27579 to 31026 kPa (4000 to 4500 psi) backpressure. Performing a wet prime
increases the stroke to its maximum length.
3. After 7 to 8 minutes of wet priming, inspect the plumbing and fittings for leaks. Use thermal
paper (if available), which turns dark on contact with methanol, to detect leaks. Repair any
leaks.
4. Remove the resistor, replacing it with a pin plug, and rerun the static leak test.
If a failing result persists replace the check valves, plunger seals, and plungers.
Note: Replace the check valves, plunger seals, and plungers only as a last resort, after all other
recommended actions have been performed without resolution.
8.4.4

Valve leak test

The valve leak test serves these purposes:
• It tests the sample inlet valve (V1) and syringe valve (V2) of the sample management
system (see
• It tests the upper and lower side of the needle seal pack for pressure leaks.
Perform the valve leak test on these occasions:
• When you suspect leakage in the sample management valves or upper and lower needle
seal pack.
• When you perform maintenance on the sample management system.
figure "Flow path through the solvent management system:" on page
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Page 162
23).