Agilent Technologies 1100 Series Service Manual page 79

If the pressure test fails
Ensure all fittings between the pump and the blank nut are tight and repeat
the pressure test. If the test fails again, insert the blank nut at the outlet of the
previous module in the stack, and repeat the pressure test. Exclude each
module one by one to determine which module is leaky.
Potential Causes of Pressure Test Failure
After isolating and fixing the cause of the leak, repeat the pressure test to
confirm the system is tight.
Potential Cause (Pump)
Loose or leaky fitting.
Untight EMPV
Damaged pump seals or plungers.
High flow sensor offset
Potential Cause (Autosampler)
Loose or leaky fitting.
Needle seat.
Rotor seal (injection valve).
Damaged metering seal or plunger.
1100 Series Nano Pump Service Manual
Troubleshooting and Test Functions
Corrective Action
Tighten the fitting or exchange the capillary.
Run the EMPV test
Run the leak test to confirm the leak.
Run the flow sensor accuracy calibration and
correct the flow sensor offset
Corrective Action
Tighten or exchange the fitting or capillary.
Exchange the needle seat.
Exchange the rotor seal.
Exchange the metering seal. Check the plunger
for scratches. Exchange the plunger if required.
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