GE AKTApure, User Manual, Page: 73 / 522

2.4.14 Conductivity monitor
Function of the Conductivity monitor
The Conductivity monitor continuously measures the conductivity of buffers and eluted proteins. The
monitor is labelled C9.
The Conductivity flow cell has two electrodes positioned in the flow path of the cell. An alternating
voltage is applied between the electrodes and the resulting current is measured and used to calculate
the conductivity of the eluent.
The conductivity is automatically calculated by multiplying the measured conductance by the cell
constant of the flow cell. The cell constant is factory-calibrated on delivery but can be re-calibrated if
needed, see Section 7.7.3 Calibrate the Conductivity monitor, on page 308.
As variation in temperature influences conductivity readings, the conductivity flow cell is fitted with a
temperature sensor that measures the temperature of the eluent. A temperature compensation factor
is used to report the conductivity in relation to a set reference temperature.
Location and illustration of the
Conductivity monitor
The illustration below shows the recommended location of Conductivity monitor C9, together with a
detailed view of the monitor.
1
2
3
4
Description Part
Inlet 1
Conductivity flow cell 2
Conductivity monitor 3
Outlet 4
ÄKTA pure User Manual 29119969 AB 73
2 The ÄKTA pure instrument
2.4 Instrument modules
2.4.14 Conductivity monitor