1100 Series Nano Pump Service Manual 67
Troubleshooting and Test Functions 2
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) Corrective Action
Loose or leaky fitting. Tighten the fitting or exchange the capillary.
Untight EMPV Run the EMPV test
Damaged pump seals or plungers. Run the leak test to confirm the leak.
High flow sensor offset Run the flow sensor accuracy calibration and
correct the flow sensor offset
Potential Cause (Autosampler) Corrective Action
Loose or leaky fitting. Tighten or exchange the fitting or capillary.
Needle seat. Exchange the needle seat.
Rotor seal (injection valve). Exchange the rotor seal.
Damaged metering seal or plunger. Exchange the metering seal. Check the plunger
for scratches. Exchange the plunger if required.
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