Agilent 1200 Preparative Pump User Manual 83
Troubleshooting and Diagnostics
6
Error Messages
Pressure Below Lower Limit
The system pressure has fallen below the lower pressure limit.
Pressure Sensor not Connected
The pressure readings, read by the pump ADC (analog-digital converter), are
missing.
The ADC reads the pressure readings from the pressure sensor every 1 ms. If
the readings are missing for longer than 10 seconds, the error message is
generated.
Probable cause Suggested actions
1 Lower pressure limit set too high. Ensure the lower pressure limit is set to a value
suitable for the analysis.
2 Air bubbles in the mobile phase. Ensure bubble free flow. Purge the preparative
pump.
3 Leak. • Inspect the pump head, capillaries and
fittings for signs of a leak.
• Purge the module. Run a pressure test to
determine whether the seals or other
module components are defective.
4 Defective pressure sensor. Exchange the Multi Assembly.
5 Defective main board. Exchange the main board.
Probable cause Suggested actions
1 Pressure sensor not connected (should be
connected to P29 on the PPM board) or
connected to the seal wash cable connector
(P23).
Ensure the pressure sensor connector is clean,
connected and seated correctly.
2 Defective pressure sensor. Exchange multi assembly.
3 Defective PPM board. Exchange the PPM board.
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