External Air Sensors - GE AKTApure User Manual

3 ÄKTA pure external modules

3.1 External air sensors

3.1 External air sensors

Introduction
Up to four external air sensors can be added to ÄKTA pure, and there are two different versions to
choose from. They differ in internal diameter and optimal position on the instrument.
The air sensors can be attached to the instrument using the rails and holders, see Adapter for air sensor,
on page 84. No Module Panels need to be removed.
In addition to be used for preventing air from entering the system, the external air sensors can be used
together with System pump A, or an Sample pump to load the entire sample volume.
Air sensor L9-1.5
L9-1.5 has a 1.5 mm inner diameter and is designed for i.d. 1.6 mm FEP, ÄKTA pure 25, and for i.d. 2.9
mm FEP tubing, ÄKTA pure 150, at the low pressure side before the pumps. It is installed in the flow
path before the system pumps or the sample pump and is used to prevent air entering the subsequent
module.
Air sensor L9-1.2
L9-1.2 has a 1.2 mm inner diameter and is designed for o.d. 1/16" tubing at the high pressure side after
the pumps. It is installed after the injection valve and is used to prevent air entering the column.
Note:
Tubing connections
Air sensor L9-1.5
Connection
between...
ÄKTA pure 25
L9-1.5 and inlet FEP, o.d. 1/8", i.d.
valves 1.6 mm
Note:
88
L9-1.2 can be used in the same fashion as L9-1.5 if O.D. 1/16" ETFE tubing is used between
the air sensor and the inlet valve.
Tubing
ÄKTA pure 150
FEP, o.d. 3/16", i.d.
2.9 mm
When sample is loaded at high flow rate and the external air sensor is placed before the pump
that is used for loading the sample, it is necessary to use longer tubing to ensure that no air
reaches the pump. Use tubing with the minimum lengths given below between the valve located
before the pump and the external air sensor. The length applies for maximum flow rate, but
shorter tubing can be used at lower flow rates.
• Sample pump S9: 40 cm.
• Sample pump S9H: 20 cm.
Connector
ÄKTA pure 25 ÄKTA pure 150
Tubing connector, Tubing connector,
5/16" + Ferrule 5/16" + Ferrule
(yellow), 1/8" (blue), 3/16"
Tubing
length
(mm)
See note
ÄKTA pure User Manual 29119969 AB