DescriptionPart
Outlet, to the air trap2
Air trap inlet3
Inlet funnel4
Manual vent valve knob5
Manual vent valve port6
Air trap outlet7
Inlet, from the air trap8
Position of the air sensor9
Outlet, to the next module10
Function
Air is trapped in the upper part of the air trap if the lower part contains liquid. The inlet
funnel is designed to increase the mixing functionality and decrease foaming. During
runs with gradients and low flow rate, make sure that the liquid level stays below the
funnel top.
The air trap is in-line by default, but can be set in by-pass position using the air trap
valve. The valve consists of a number of membrane valves that allow the flow to be di-
rected through the air trap or to by-pass the air trap.
An air sensor is positioned near the outlet of the air trap valve. It detects air even when
the air trap is by-passed. If air is detected in the flow path, its presence is indicated in
the Process Picture. If air is detected in the flow path and the air sensor alarm is enabled,
the run is paused.
When a large amount of air is trapped, the flow rate over the column is temporarily de-
creased. If the air trap is completely filled with air, air is detected by the sensor.
Air sensor sensitivity
The air sensor has two sensitivity levels, High that detects down to approximately 30 μL
bubbles, and Normal that detects down to approximately 1 mL bubbles. The level High
is default for the air sensor in the air trap valve.
To change the sensitivity, select System:Settings in the System Control module to open
the System Settings dialog box. Select Air sensor and Sensitivity Air Trap sensor. Set
the sensitivity as required, see illustration below.
42 ÄKTA pilot 600 User Manual 29274559 AA
3 Description of modules
3.6 Air trap valve and air trap
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