AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | OI/AWT420-EN REV. B
93
Connectivity/Communications (optional)
Ethernet
HTTP, HTTPS, FTP, Secure FTP
PROFIBUS DP
MODBUS
RTU RS485
HART
•
• Configured range
4 to 20 mA, user-programmable across
measurement 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
• Configuration
Can be assigned to either measured variable
• Isolation
Data logging
Storage
• Measurement value storage
(programmable sample rate)
•
Storage media
Chart view
On local display
Historical review
Of data
Data transfer
formats
Environmental data
Ambient operating temperature:
Ambient operating humidity:
Up to 95 % RH non-condensing
Storage temperature:
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
constant
Conductivity
range
Display
resolution
Accuracy
repeatability
measurement
range per decade
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
Linear, UPW, NaCl, HCl and NH
3
Reference temperature
Configured output range
Cell constant Min. span Max. span
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