8 Diagnostic Testing and Troubleshooting
236 July 29, 2013, 715003794 Rev. B
• After 7 to 8 minutes of wet priming, inspect the plumbing and fittings
for leaks. Use thermal paper, which turns dark on contact with
methanol, to detect leaks. Repair any leaks.
• Remove the resistor, replacing it with a pin plug, and rerun the static
leak test.
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 the figure “Flow path through the solvent
management system:” on page 27).
• 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.
Required materials
•Pin plug
• Wrenches, 5/16-inch, open-end, two
• Waste container
To perform the valve leak test:
1. In the Other Diagnostic screen, select Valve leak test, and then press the
OK screen key.
Tip: You can send the system pressure ramp and decay to an external
device using the System Pressure Chart Output parameter. See “Set I/O
parameter values” on page 162 for details.
2. Disconnect the red outlet line from the sample management system, and
use the pin plug to plug the red outlet line.
3. Collect the solvent runoff in an appropriate waste container.
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