34 AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | CI/AWT420-EN REV. B
…11 Specification
4-electrode conductivity
Conductivity input
Measurement range and resolution
Sensor
group
Conductivity
range
Display
resolution
Accuracy
repeatability
A
range per decade
B
Dynamic response
<3 s for 90 % step change when damping is Off
Damping
Configurable: Off, Low, Medium and High
Temperature input
Temperature element types
• Automatic temperature sensor recognition for Pt100,
configurations
• Temperature element can be used for automatic
temperature compensation of the conductivity solution
Measurement range and resolution
Sensor
group
Temperature
range
Display
resolution
Accuracy
repeatability
None User-programmable
N/A
Temperature compensation modes
• 0 to 15 % NaOH
• 0 to 18 % HCl
• 0 to 20 % H
2
SO
4
• 0 to 40 % H
3
PO
4
• 0 to 20 % NaCl
• 0 to 50 % KOH
• User-defined table
Reference temperature
Configured output range
Sensor group Min. span Max. span
A
B
pH/ORP (Redox)
pH/ORP (Redox) input
Sensor types
pH: Glass, Antimony (Sb)
ORP (Redox): Platinum (Pt), Gold (Au)
Input impedance
>1×10
13
Measurement range and resolution
Type Range Display resolution Accuracy repeatability
pH
ORP
±2000 MV: ±3 MV
Dynamic response
<3 s for 90 % step change when damping is Off
Damping
Configurable: Off, Low, Medium and High
Temperature input
Temperature element types
• Automatic temperature sensor recognition for Pt100,
configurations
• Temperature element can be used for automatic
temperature compensation of the conductivity solution
Measurement range and resolution
Sensor
group
Temperature
range
Display
resolution
Accuracy
repeatability
None User-programmable
N/A
Temperature compensation modes
• pH: Manual, Automatic Nernstian,
Nernstian with solution coefficient
• ORP: Manual, solution compensation coefficient
Reference temperature
Configured output range
Type Min. span Max. span
pH
ORP
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