
Description
Flow path
Both pH electrode and Flow restrictor are bypassed.
By-pass
Flow restrictor is in use and pH electrode is bypassed.
Restrictor
Both pH electrode and Flow restrictor are in use.
Restrictor
and pH
pH electrode is in use and Flow restrictor is bypassed.
pH
Flow path used when calibrating the pH monitor and when filling the pH flow cell
with storage solution. The Cal port is used to inject solution into the flow cell using
a syringe.
Calibration
Excess solution leaves the valve through port W3.
pH monitor
The pH monitor continuously measures the pH of the buffer and eluted proteins when the pH electrode
is inline. A pH electrode can be installed in the pH flow cell. For instruction on how to install the pH
electrode, see Section 7.5.2 Replace the pH electrode, on page 275. The pH electrode should not be ex-
posed to more than 0.5 MPa during a normal run, but can withstand pressure spikes of 0.8 MPa. It is
therefore important to place it after the column.
The illustration below shows the location of the pH flow cell and a pH electrode installed in the pH
valve.
Description
Part
pH flow cell
1
pH electrode
2
ÄKTA pure User Manual 29119969 AB
63
2 The ÄKTA pure instrument
2.4 Instrument modules
2.4.10 pH valve
Содержание AKTApure
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