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January 2009 UDA2182 Universal Dual Analyzer Product Manual 163
8.7.7 Cation pH Calibration
The UDA allows for a sample calibration of the specific or influent pH value. Here an
independent sample is withdrawn from the sampling equipment and pH is determined with
equipment of known accuracy. This independent pH value is then entered into the UDA
as a pH calibration constant.
Recommended where pH is stable, or for high-purity water applications
This method is recommended only where the pH is stable and changes very slowly. It is
also recommended for high-purity water measurement applications. Special instructions
for high-purity water applications are provided below.
Materials
To use the sample method, follow the instructions in Table 8-4.
Materials required are:
• A clean beaker for collecting the sample.
• A calibrated portable instrument for measuring pH of the sample.
• Distilled or de-ionized water to rinse the electrode.
Procedure
Make sure both inputs are “Conductivity”.
Refer to Section 6.4.1 –
General Rules for Editing.
Table 8-10 Procedure for Sample Method of Calibrating Cation pH
Step Action Screen
1
Prepare the Calibration meter.
2
Press
Calibrate
CALIBRATION
Input Temp Cal
Output Cal
Cal History
Input PV Cal
CALIBRATION
Input Temp Cal
Output Cal
Cal History
Input PV Cal
Use
to select
Input PV Cal
3
Press
Enter
Input 1 Conduc
Input 2 Conduc
Cation pH
Input 1 Conduc
Input 2 Conduc
Cation pH
Use
to select
Cation pH