GE AKTA avant User Manual page 65

Part
3
4
5
6
7
8
Function of Inlet valve A and Inlet
valve B
Inlet valve A and Inlet valve B enable automatic changing between different buffers and
wash solutions, and can be used to generate gradients by mixing buffer from Inlet valve
A and buffer from Inlet valve B.
The air sensors integrated in Inlet valve A and Inlet valve B can be used to prevent intro-
duction of air into the pumps and columns. For information on how to change settings
and parameters for the use of air sensors, see Chapter 5 Operation, on page 155.
The Run Data for air sensors shows the status of the air sensor. If an alarm is triggered
and then acknowledged, the Run Data will be reset to No Air even if there still is air in
the sensor. When the flow starts another alarm will go off if air is still present.
Air sensor sensitivity
The air sensor sensitivity can be set to two values. Normal is used to detect when a
buffer or sample vessel is empty. High is used to detect small air bubbles.
Parameter
Normal (default)
ÄKTA avant User Manual 29035184 AE
Description
Quaternary valve
Inlet valve B
Integrated air sensor (behind the
plug)
Inlet ports of Inlet valve A
Inlet ports Q1-Q4 of Quaternary
valve
Outlet ports from Quaternary valve
to Inlet valve A and Inlet valve B
Air volume detected
ÄKTA avant 25
30 μl
3 Standard instrument modules
Label in
ÄKTA avant 25
Q9
V9-IB
NA
A1 to A7
Q1 to Q4
A and B
ÄKTA avant 150
100 μl
3.4 Inlet valves
ÄKTA avant 150
Q9
V9H-IB
NA
A1 to A7
Q1 to Q4
A and B
Usage
Detect empty
buffer/sample ves-
sels
65