AZURA® Assistant ASM 2.2L Instructions V6803
38 Troubleshooting
Problem
Solution
Pressure and flow rate
variations
Pump without pressure sensor: Pay
attention to the influence of the pressure
on the flow rate (will not be compen-
sate).
Purge the pump head to remove the air
bubbles.
Always tighten the inlet screw fittings
and outlet screw fittings on the pump
head with a torque wrench and 7.5 Nm.
Clean the ball valves.
Exchange the ball valves.
Exchange the pump head
Inform the technical support of
KNAUER.
Pump head leaks
Inspect the inlet and outlet screw fittings
of the pump head.
When the pump head seals are defec-
tive, solvent enters the piston back-
flushing. Inform the technical support of
KNAUER.
Exchange the pump head.
Valves
Valve leaks
Tighten the connections.
Pressure variations
caused by leaking valve
head
Exchange the rotor seals.
Inform the technical support of KNAUER.
11.3 System messages
If other system messages are displayed besides those listed below, please
turn the device off and then on. In case the system message repeats itself,
inform the technical support of KNAUER .
The system messages are sorted alphabetically.
System message
Solution
A
At least one wavelength
must be valid.
Check whether a channel is on. Check
whether the wavelengths are within per-
missible range (190 – -500 nm).
C
Calibration failed
Switch the device off and on. Check wheth-
er lamps, motor and filter are functioning
correctly. In case the system message
repeats itself, inform the technical support
of KNAUER . Restart calibration on the
device or in the chromatography software.
Cannot initialize
Check cables and connections in local area
network.
Further measures
