78 Agilent 1200 Preparative Pump User Manual
6 Troubleshooting and Diagnostics
Error Messages
Leak
A leak was detected in the module.
The signals from the two temperature sensors (leak sensor and
board-mounted temperature-compensation sensor) are used by the leak
algorithm to determine whether a leak is present. When a leak occurs, the leak
sensor is cooled by the solvent. This changes the resistance of the leak sensor
which is sensed by the leak-sensor circuit on the main board.
Leak Sensor Open
The leak sensor in the module has failed (open circuit).
The current through the leak sensor is dependent on temperature. A leak is
detected when solvent cools the leak sensor, causing the leak-sensor current to
change within defined limits. If the current falls outside the lower limit, the
error message is generated.
Probable cause Suggested actions
1 Loose fittings. Ensure all fittings are tight.
2 Broken capillary. Exchange defective capillaries.
3 Loose or leaking active inlet valve, outlet ball
valve, or EMPV.
Ensure pump components are seated correctly.
If there are still signs of a leak, exchange the
appropriate seal (active inlet valve, outlet ball
valve, or EMPV).
4 Defective pump seals. Exchange the pump seals.
Probable cause Suggested actions
1 Leak sensor not connected to the main
board.
Ensure the leak sensor is connected correctly.
2 Defective leak sensor. Exchange the leak sensor.
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