Ph/Redox/Orp - ABB AWT420 Operating Instruction

AW T4 2 0 | U N I V E R S A L 4 - W I R E , D U A L- I N P U T T R A N S M I T T E R | O I/A W T4 2 0 - E N R E V. B

pH/Redox/ORP

Menu
Calibrate
Exit Select
Menu Comment
Sensor Cal See pH/Redox/ORP calibration, page 52
There are four possible calibration modes:
• 1-point manual calibration (adjusts the calibration check value)
• 2-point manual calibration (adjusts the check and slope values)
• 1-Point automatic calibration (adjusts the calibration check value)
• 2-Point automatic calibration (adjusts the check and slope values)
Note . Automatic calibrations are not available for Redox/ORP measurements
Temperature Cal
See Temperature calibration procedure, page 69 .
Edit Cal
pH Slope Note: pH sensors only.
Edit the slope value:
• Valid slope values range from 40 to 150 %
pH Offset Note: pH sensors only.
Edit the offset value:
• Valid offset values are: 0.00 to 14.00pH
mV Slope Note: Redox/ORP sensors only.
Edit the slope value:
• Valid slope values range from 40 to 150 %
mV Offset Note: Redox/ORP sensors only.
Edit the offset value:
• Valid offset values are: ±1000mV
Temp . Slope
Edit the temperature slope value:
• Valid slope values range from 40 to 160 %
Temp . Offset Edit the temperature offset value:
• Valid offset values are ±40 °C
Sample Collection Note: pH sensors only.
See In process calibrations, page 79.
Collection Complete Note: pH sensors only
See In process calibrations, page 79.
Restore Cal Defaults Resets slope and offset values to default values.
This section describes how to calibrate the sensor and involves measuring the
sensor's sensitivity to pH and temperature by exposing the sensor to samples of
known pH/Temperature values
Notes.
• Access to the Calibrate menu is via Calibrate and Advanced levels only.
• During calibration, current outputs and alarms are set to hold automatically
if Hold Outputs is enabled – see below.
59
Default
100%
7.00pH
100%
0mV
100%
0°C