8 Diagnostic Testing and Troubleshooting
224 July 29, 2013, 715003794 Rev. B
Perform the compression check
The compression check serves these functions:
• Automatically compresses the solvent in the sample loop and syringe
• Checks for leaks
• Determines the compressibility of the solvent in the system
Perform a compression check if you suspect seal pack leakage. Symptoms of
seal pack leakage include:
• Dripping in the sample chamber
• Abnormally low system pressure
To perform the Compression Check diagnostic test:
1. Install on the red outlet line a restrictor that generates at least
3447.4 kPa (34.5 bar, 500 psi) of backpressure when the solvent flow is
3.0 mL/min or less.
Tip: If a column is installed in the flow path during this test, you do not
need a restrictor.
2. Connect the restrictor outlet to a waste line.
3. In the Diagnostics screen, press the Comp Chk screen key.
Result: The Compression Check dialog box appears.
These are the fields in the Compression Check dialog box:
• Compressed Volume field – Reports the compressed volume of the
sample loop.
• Delta Decay Pressure field – Reports the change in the decay
pressure.
• Final Pressure field – Reports sample loop pressure after the test is
completed.
See page 97 for the correct parameter settings.
4. Press the Start screen key to begin the compression check test.
The test is completed, the Compression Check screen either displays values in
the Compressed Volume, Delta Decay, and Final Pressure fields (indicating a
successful test) or a Fail status.
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