Tankside Monitor NRF81
Operating menu
Hauser
139
Direction of signal
Type of signal
4..20mA output
Output to higher-level unit
Analog (4...20mA)
HART slave +4..20mA output
Output to higher-level unit
• Analog (4...20mA)
• HART
Depending on the terminals used, the Analog I/O module is used in the passive or active
mode.
Mode
Terminals of the I/O module
1
2
3
Passive
(power supply from external source)
-
+
not used
Active
(power supplied by the device itself)
not used
-
+
In the active mode the following conditions must be met:
• Maximum current consumption of the connected HART devices: 24 mA
(i.e. 4 mA per device if 6 devices are connected).
• Output voltage of the Ex-d module: 17.0 V@4 mA to 10.5 V@22 mA
• Output voltage of the Ex-ia module: 18.5 V@4 mA to 12.5 V@22 mA
Current span
Navigation
Setup → Advanced setup → Input/output → Analog I/O → Current span
Prerequisite
Operating mode
parameter (→ 138) ≠
Disabled
option or
HART master
option
Description
Defines the current range for the measured value transmission.
Selection
• 4...20 mA NAMUR
• 4...20 mA US
• 4...20 mA
• Fixed current
Factory setting
4...20 mA NAMUR
Additional information
Read access
Operator
Write access
Maintenance
Meaning of the options
Option
Current range for process
variable
Lower alarm signal level Upper alarm signal level
4...20 mA
4 to 20.5 mA
< 3.6 mA
> 21.95 mA
4...20 mA NAMUR 3.8 to 20.5 mA
< 3.6 mA
> 21.95 mA
Содержание NRF81
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