
2.4.10
pH valve
Function of the pH valve
The pH valve is used to direct the flow to a pH electrode when inline monitoring of pH is desired during
a run. The pH valve is labeled V9-pH for ÄKTA pure 25 and V9H-pH for ÄKTA pure 150.
The pH valve has an integrated flow cell in which the pH electrode can be installed.
It is recommended to connect a Flow restrictor to the pH valve. The flow restrictor is used to generate
a back pressure high enough to prevent the formation of air bubbles in the UV flow cell.
The valve directs the flow to the pH electrode and to the flow restrictor, or bypasses one or both.
The Flow restrictor is normally included in the flow path after the Conductivity monitor. When
installing the pH valve on ÄKTA pure, the flow restrictor should be moved from its normal po-
sition on the conductivity monitor to the pH valve.
Note:
Location and illustration of the pH valve
The illustration below shows the recommended location, together with a detailed view of
the pH valve.
1
2
3
4
Description
Part
pH valve
1
pH electrode
2
pH flow cell
3
Flow restrictor
4
ÄKTA pure User Manual 29119969 AB
61
2 The ÄKTA pure instrument
2.4 Instrument modules
2.4.10 pH valve
Summary of Contents for AKTApure
Page 1: ...ÄKTA pure User Manual ...
Page 2: ...Page intentionally left blank ...
Page 520: ...Page intentionally left blank ...
Page 521: ...Page intentionally left blank ...