Aalborg PWE Digital - Manual (Page 8)

2.2.1 Power Supply Connections
The power supply requirements for PWE flow meter are: 11 to 26 Vdc 100 mV
maximum peak to peak output noise, (unipolar power supply).
Pin A ------------- DC Power (+)
Pin B ------------- DC Power (-)
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.
Use of the PWE 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.
2.2.2 Analog Output Signals Connections
PWE series Flow Meters are equipped with either calibrated 0-5 or calibrated 4-20
mA output signals (jumper selectable). This linear output signal represents
0-100% of the flow meter’s full scale range.
CAUTION: Do not apply power voltage above 26Vdc.
Doing so will cause PWE damage or faulty operation.
3
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Make sure power is OFF when connecting or disconnecting any cables
in the system.
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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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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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