Aalborg Vortex - Manual (Page 18)

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This linear output signal by default represents 0-100% of the selected process
variable full scale range. User may adjust 4mA and 20 mA settings individually
for each output if different range of the process variable is required (see
Paragraph 5.3.12.4)
Terminal TB3, Pin 1 --------------- (+) Plus 4-20mA Analog Output#1
Terminal TB3, Pin 2 --------------- (-) Minus 4-20mA Analog Output#1
Terminal TB3, Pin 3 --------------- (+) Plus 4-20mA Analog Output#2
Terminal TB3, Pin 4 --------------- (-) Minus 4-20mA Analog Output#2
4.5.3 Programmable optically isolated Output
Signals Connections
Optocoupler #1 - Terminal TB4 (pins 6 and 5):
Terminal TB4 Pin 6 --------------- Plus (+) (passive)
Terminal TB4 Pin 5 --------------- Minus (-) (passive)
Optocoupler #2 - Terminal TB4 (pins 4 and 3):
Terminal TB4 Pin 4 --------------- Plus (+) (passive)
Terminal TB4 Pin 3 --------------- Minus (-) (passive)
WARNING: The 4-20 mA current loop output is self-powered (sourcing
type, non-isolated). Do NOT connect an external voltage source to the
output signals.
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4.5.2 Analog 4-20 mA Output Signals Connections
Vortex Flow Meters are equipped with two calibrated 4-20 mA output signals
(which can be assigned to any of four process variables: Volumetric Flow, Mass
Flow, Temperature*, Pressure*).
CAUTION: When connecting the load to the output terminals, do not
exceed the rated values shown in the specifications. Failure to do so
might cause damage to this device. Be sure to check if the wiring and
the polarity of the power supply is correct before turning the power ON.
Wiring error may cause damage or faulty operation.
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Use of the Vortex flow meter in a manner other than that specified in this manual
or in writing from Aalborg, may impair the protection provided by the equipment.