132 Agilent InfinityLab LC Series 1260 Infinity II Isocratic- and Quaternary Pumps User Manual
7
Test Functions and Calibration
Leak Rate Test
Potential Causes of Leak Rate Test Failure
Secondary Leak
If a leak is found for movement of piston 2 (secondary leak), the following
reasons are possible:
Primary Leak
If a leak is found for movement of piston 1 (primary leak), any leak described
for piston movement 2 will cause a failure for piston 1 as well, as the liquid
can move through the outlet valve to chamber 2. Such cases need to be
identified as described before. Additionally, following causes are possible:
Probable cause Suggested actions
1
System not flushed properly
Flush system for several minutes
2
Degassing efficiency is low
Check degasser performance
3
Purge valve not closed or defect
Check purge valve
4
Blank nut not installed tightly
Tighten or replace blank nut
5
Outlet valve leaking (read below)
Replace outlet valve
6
Leak at piston 2 or seal in chamber 2
Inspect piston, replace piston and/or seal
Probable cause Suggested actions
1
Leak at piston 1 or seal in chamber 1
Inspect piston, replace piston and/or seal
2
Leak at inlet valve
Replace inlet valve or inlet valve cartridge (AIV
only)
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