Potential Causes Of Leak Rate Test Failure - Agilent Technologies 1260 Infinity II User Manual

Potential Causes of Leak Rate Test Failure

For binary pumps, secondary pump chambers are connected. A leak observed in any of
N O T E
these chambers may be caused by the other secondary pump chamber.
Secondary Leak
If a leak is found for movement of piston 2 (secondary leak), the following
reasons are possible:
Probable cause
1
2
3
4
5
6
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
1
2
InfinityLab LC Series 1260 Infinity II Binary Pump User Manual
System not flushed properly
Degassing efficiency is low
Purge valve not closed or defect
Blank nut not installed tightly
Outlet valve leaking (read below)
Leak at piston 2 or seal in chamber 2
Leak at piston 1 or seal in chamber 1
Leak at inlet valve
Test Functions and Calibration
Pump Leak Rate Test
Suggested actions
Flush system for several minutes
Check degasser performance
Check purge valve
Tighten or replace blank nut
Replace outlet valve
Inspect piston, replace piston and/or seal
Suggested actions
Inspect piston, replace piston and/or seal
Replace inlet valve or inlet valve cartridge (AIV
only)
7
109