Connectivity/Communications (Optional); Data Logging; Environmental Data; 2-Electrode Conductivity - 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

Connectivity/Communications (optional)

Ethernet
HTTP, HTTPS, FTP, Secure FTP
PROFIBUS DP
DPV0, DPV1
MODBUS
RTU RS485
HART
• Fieldcomm certified version – HART 7
• Configured range
– 4 to 20 mA, user-programmable across
measurement range
• Dynamic range
– 3.8 to 20.5 mA with 3.6 mA low alarm level,
21 mA high alarm level
• Accuracy
– ±0.25 % of reading
• Maximum load resistance
– 500 Ω at 20 mA
• Configuration
– Can be assigned to either measured variable
• Isolation
– 500 V DC from any other circuitry

Data logging

Storage
• Measurement value storage
(programmable sample rate)
• Audit log*, Alarm log*, Calibration log, Diagnostics log
Storage media
SD card, up to 32 GB capacity
Chart view
On local display
Historical review
Of data
Data transfer
SD card interface – Windows-compatible FAT file system,
data and log files in Excel and DataManager Pro compatible
formats

Environmental data

Ambient operating temperature:
–10 to 55 °C (14 to 131 °F)
Ambient operating humidity:
Up to 95 % RH non-condensing
Storage temperature:
–20 to 70 °C (–4 to 158 °F)
Altitude:
2000 m (6562 ft) max. above sea level
* Audit log and Alarm log data are stored in the same log file.

2-electrode conductivity

Conductivity input
Measurement range and resolution
Cell Conductivity
constant range
0.01 0 to 200 µS/cm
0.05 0 to 1000 µS/cm
0.1 0 to 2000 µS/cm
1 0 to 20000 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
Linear, UPW, NaCl, HCl and NH
Reference temperature
25 °C (77 °F)
Configured output range
Cell constant
0.01
0.05
0.1
1
Display Accuracy
resolution repeatability
0.001 µS/cm
±1.0 % of
0.001 µS/cm
measurement
0.01 µS/cm
range per decade
0.1 µS/cm
Display Accuracy
range resolution repeatability
(0.18 °F)
0.1 °C
(0.1 °F)
3
Min . span Max . span
1 µS/cm 200 µS/cm
5 µS/cm 1000 µS/cm
10 µS/cm 2000 µS/cm
100 µS/cm 20000 µS/cm
93
0.1 °C
N/A