AZURA® Assistant ASM 2.2L Instructions V6803
Troubleshooting 37
11.2 Possible problems and rectifications
Problem
Solution
Assistant
Device will not turn on.
Inspect the power cable to ensure that it is
plugged into the power supply.
Detector
Baseline drift
Maintain constant temperature condi-
tions during the measurement.
Avoid air draft.
Avoid vibrations.
Device cannot be calibrat-
ed.
1. Fasten the knurled-head screws on the
flow cell to prevent incursion from
interfering light or an electronics error.
2. Insert the test cell.
3. Inspect the calibration with a weak
absorbing eluent.
Baseline noise
1. Inspect the flow-cell assembly.
2. Fasten the knurled-head screws on the
flow cell to prevent incursion from
interfering light or an electronics error.
3. Exchange the defective flow cell.
4. Inspect the service life of the lamp.
The relationship of the
signal to the light path
reference is very low.
1. Flush the flow cell.
2. Clean the flow-cell window.
3. Replace the lamps
Pump
When purging, the pump
switches off
Check if the venting screw on the pressure
sensor is turned open.
Pump does not transport
solvent
Purge the pump head to remove the air
bubbles.
Inspect the eluent filter of the HPLC col-
umn and change when blocked
Clean ball valves.
Exchange the ball valves.
When the pump head seals are defec-
tive, solvent enters the piston back-
flushing. Inform the technical support of
KNAUER.
Exchange the pump head.