ABB 4630 - Operation; Instrument Start-Up; Operation - Ph Measurement Mode

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6 OPERATION
Table 6.1 Calibration Overview
6.1 Instrument Start-up
Ensure all electrical connections have been made correctly and switch on the power supply. If the instrument is being
commissioned for the first time its parameters must be programmed, as detailed in Section 7, before carrying out a pH Calibration.
6.2 Operation – pH Measurement Mode
Operation in the pH measurement mode comprises an Operating Page and a pH Calibration Page. The Operating Page is a general
use page in which parameters can be viewed but not altered. To alter or program a parameter refer to the programming pages in
Section 7.
Three calibration procedures are available, Single Point, Two-point (Manual Mode) and Two-point (Automatic Mode). Refer to Table
6.1 for an overview of each procedure.
A 5-digit calibration code is used to prevent unauthorized access to the pH calibration page. The value is preset at 00000 to
allow access during commissioning but should be altered to a unique value, known only to authorized operators, in the
Set Up
Alarms Page – see Section 7.4.
Information.
• pH Check Value – is an indication of the offset of the electrode system and is expressed in pH units. 7pH is the optimum
value for glass electrode systems and 0pH for Antimony systems. The amount the check value changes after each
calibration reflects the amount of electrical drift from the electrode system.
•
% Slope Value – is an indication of the response of the electrode system with respect to the expected theoretical response.
The value should be between the programmed minimum % slope value (see pH Calibration Minimum Slope Value in the Set
Up Parameters Page on page 25) and 105% for a successful calibration.