Aalborg Vortex - Manual (Page 17)

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CAUTION: Do not apply power voltage above 30Vdc. Doing so will
cause Vortex meter damage or faulty operation.
Make sure power is OFF when connecting or disconnecting any cables
in the system.
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The TB1 – TB4 terminals accept 14 to 24 gauge wires, but 18 gauge shielded
wire (Belden 8760) or 20 gauge shielded wire (Belden 9154) is recommended.
When making wiring connections, cable glands should be fitted and sealed to
prevent moisture entering the enclosure.
4.5.1 Power Supply Connections
The power supply requirements for Vortex flow meter are: 15 to 30 Vdc 100 mV
maximum peak to peak output noise, (unipolar power supply)
Terminal TB1, Pin 1 --------------- DC Power (+)
Terminal TB1, Pin 2 --------------- DC Power (-)
Terminal TB1, Pin 3 --------------- GND, building protective earth
(connect to dedicated GND clamp
inside of the enclosure).
The (+) and (-) power inputs are each protected by a 300mA M (medium time-
lag) resettable fuse. If a shorting condition or polarity reversal occurs, the fuse
will cut power to the flow transducer circuit. Disconnect the power to the unit,
remove the faulty condition, and reconnect the power. The fuse will reset once
the faulty condition has been removed.
NOTE: For remote transmitter option use shielded twisted pair cable in
order to reduce EMI on sensors signals. Use 24 AWG or larger wire and
do not exceed 100 feet (30 meters). Use supplied cable termination kit
to properly terminate the transmitter end of the signal cable.
The termination kit includes:
1. Molex 3 position Connector Housing (P/N: 50-57-9403) 1 ea.
2. Molex Female Connector Terminals (P/N: 16-02-1114) 3 ea.
Make sure to connect terminal #4 on the meter side to pin #2
(central pin) on the Molex connector (see APPENDIX D on page 104
for more details)