AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | OI/AWT420-EN REV. B
53
pH/Redox/ORP
Menu Comment Default
Tag
Operator Pages.
Measurement Type Select measurement type:
• pH/Redox/ORP
Note. If a change is made the I/O sources are reset.
pH
Range High Set the span value used in Chart and Bargraph views.
Range Low Set the zero value used in Chart and Bargraph views.
Filter Type Select the signal filtering type:
• None/Low/Medium/High
None
Note. The following menus are displayed only if Measurement TypepH.
Temp. Compensation Set the type of temperature compensation:
• Manual/Automatic/Auto solution
Automatic
Solution Coeff. NoteTemp. Compensation Auto solution.
See Appendix A, .
N/A
Manual Temperature Note. Temp. CompensationManual.
N/A
Note. The following menus are displayed only if Measurement TypeRedox/ORP.
Temperature Sensor Set the type of temperature measurement:
• Manual/Automatic
Note. If Temperature SensorManual, the temperature value is not displayed in the associated
Operator page or Signals View.
N/A
Low Slope Limit A pH probe degrades over time. As this happens the slope calculated by a calibration procedure gradually
decreases. Set the slope value below which a calibration fails. The low slope warning diagnostic is
Sensor Diagnostics
Broken Glass Note: Measurement Type pH.
•
Out Of Solution
•
Ref. Poisoning Note:
•
Ref. Failure Note:
•
Ref. Blocked
•
Ref. Alarm Limit Note: Ref. Blocked sensor diagnostic is Enabled.
A blocked reference electrode is detected when the impedance of the reference electrode exceeds
a given limit. Set the impedance value above which the reference blocked diagnostic is activated.
N/A
Reset To Defaults Select to reset all Sensor Setup parameters to their default values.
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