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

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:
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
Internal Outlet Valve Leak
A leak of the outlet valve will be identified separately (internal outlet valve
leak) by calculating the difference between leak rate 1 and leak rate 2. If the
second leak rate is higher than the first one, this is due to a flow back through
the outlet valve.
Probable cause
1
1260 Infinity QuatPump VL 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
Leak at outlet valve
Test Functions and Calibration
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)
Suggested actions
Replace the part which has failed and re-run the test.
8
Leak Rate Test
105