4-Electrode Conductivity; Ph/Orp (Redox) - ABB AWT420 Operating Instruction

94 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
...17 Specification

4-electrode conductivity

Conductivity input
Measurement range and resolution
Sensor Conductivity
group range
A 0 to 2000 mS/cm
B 0 to 2000 µS/cm
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,
Pt1000 and 3k Balco RTDs in either 2-lead or 3-lead
configurations
• Temperature element can be used for automatic
temperature compensation of the conductivity solution
Measurement range and resolution
Sensor Temperature
group
Pt100 –20 to 200 °C
Pt1000 (–4 to 392 °F)
3K Balco
None User-programmable
–20 to 300 °C
(–4 to 572 °F)
Temperature compensation modes
• 0 to 15 % NaOH
• 0 to 18 % HCl
• 0 to 20 % H SO
2 4
• 0 to 40 % H PO
3 4
• 0 to 20 % NaCl
• 0 to 50 % KOH
• User-defined table
Reference temperature
25 °C (77 °F)
Configured output range
Sensor group
A
B
Display Accuracy
resolution repeatability
0.1 µS/cm
±0.5 % of measurement
range per decade
0.01 µS/cm
Display Accuracy
range resolution repeatability
(0.18 °F)
0.1 °C
(0.1 °F)
Min . span Max . span
100 µS/cm 2000 mS/cm
10 µS/cm 2000 µS/cm

pH/ORP (Redox)

pH/ORP (Redox) input
Sensor types
pH:
ORP (Redox): Platinum (Pt), Gold (Au)
Input impedance
>1×10 Ω
13
Measurement range and resolution
Type
pH 0 to 14 pH
ORP ±2000 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,
Pt1000 and 3k Balco RTDs in either 2-lead or 3-lead
configurations
• Temperature element can be used for automatic
0.1 °C
temperature compensation of the conductivity solution
Measurement range and resolution
N/A
Sensor
group
Pt100
Pt1000
3K Balco
None
Temperature compensation modes
• pH:
• ORP:
Reference temperature
25 °C (77 °F)
Configured output range
Type
pH
ORP
Glass, Antimony (Sb)
Range Display resolution Accuracy repeatability
0.01 pH
1 mV
Temperature Display
range resolution
–20 to 200 °C
(–4 to 392 °F)
(0.1 °F)
User-programmable
–20 to 300 °C
(–4 to 572 °F)
Manual, Automatic Nernstian,
Nernstian with solution coefficient
Manual, solution compensation coefficient
Min . span
1 pH
100 mV
±0.01 pH
±1800 MV: ±1 mV
±2000 MV: ±3 MV
Accuracy
repeatability
0.1 °C
(0.18 °F)
0.1 °C
N/A
Max . span
14 pH
4000 mV