Automatic calibration of level
sensors
Follow the instruction below to calibrate the air trap sensors automatically.
ActionStep
Empty the air trap completely from liquid using the Drain instruction for the
air trap (see Air trap valves, on page 62).
1
Use the instruction System:Calibrate:LS_air to perform the calibration.2
Fill the air trap until liquid comes out through the top valve by pumping in
liquid using the Fill instruction. Turn off the pump.
3
Use the instruction System:Calibrate:LS_liquid to perform the calibration.4
Manual calibration of level
sensors
Follow the instruction below to calibrate the air trap sensors manually.
ActionStep
Empty the air trap from liquid using the Drain instruction for the air trap (see
Air trap valves, on page 62).
1
Hold a tool made of iron (e.g. a wrench) close to the cross hairs on the side
of the level sensor for a few seconds (< 5 sec), until the green indicator light
is flashing.
2
Remove the iron tool. The flashing will end and the LED indicator light will
display a steady green light.
3
Repeat steps 2 and 3 for the high level sensor.4
Fill the air trap until liquid comes out through the top valve by pumping in
liquid using the Fill instruction. Turn off the pump.
5
154 ÄKTAprocess Operating Instructions 29-0252-49 AA
6 Maintenance
6.6 Repair and calibration
6.6.2 Air trap calibration
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