Bio-Rad ChromLab™ Software - Manual (Page 76)

2 | The NGC Instrument
74 | NGC Chromatography Systems and ChromLab Software
How the pH Detector Works
The integrated pH electrode enables inline pH monitoring during a run. ChromLab
calculates and displays temperature-compensated pH values.
You can program the position of the pH valve in ChromLab to direct the flow to the
pH electrode, or to bypass the electrode. The section Changing the Flow Paths of
the pH Valve on page 75 explains how to change the flow path.
The pH valve has an integrated calibration port to calibrate the probe offline without
disconnecting the module from the system. Calibration is performed using
calibration standards in ChromLab. For more information, see Calibrating pH on
page 145 .
Port Description
In Inlet from the conductivity monitor
Out Outlet to the fraction collector
Cal In Calibration inlet reserved for calibrating the pH valve
Cal Out Outlet to calibration waste