Aalborg DFM Digital - Manual (Page 7)

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+12Vdc or +24Vdc (unipolar power supply)
DC Power (+) --------------- pin 1 of the 25 pin "D" connector
DC Power (-) --------------- pin 18 of the 25 pin "D" connector
Caution: DO NOT CONNECT 24Vdc POWER SUPPLY UNLESS YOUR
DFM METER WAS ORDERED AND CONFIGURED FOR 24Vdc!
(See power requirements label at the rear of the DFM meter)
2.2.2 Output Signals Connections
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 that the wiring
and the polarity of the power supply is correct before turning the power
ON. Wiring error may cause damage or faulty operation.
DFM series Mass Flow Meters are equipped with either calibrated 0-5 VDC (0-10
VDC optional) or calibrated 4-20 mA output signals (jumper selectable). This lin-
ear output signal represents 0-100% of the flow meter's full scale range. Multi
Parameter versions (DFM 27/37/47) are in addition equipped with either a cali-
brated 0-5 VDC (0-10VDC optional) or a calibrated 4-20 mA output signal (jumper
selectable) for pressure and temperature. Pressure linear output signal represents
0-100PSIA (46.9 kPa). Temperature linear output signal represents 0-50
F C.
Warning: All 4-20 mA current loop outputs are self-powered
(non-isolated).
Do not connect an external voltage source to the output signals!
Flow 0-5 VDC or 4-20 mA output signal connection:
Plus (+) ------------------- pin 2 of the 25 pin "D" connector
Minus (-) ------------------- pin 15 of the 25 pin "D" connector
Temperature 0-5 VDC or 4-20 mA output signal connection
(For DFM 27/37/47 only):
Plus (+) -------------------- pin 3 of the 25 pin "D" connector
Minus (-) -------------------- pin 16 of the 25 pin "D" connector
Pressure 0-5 VDC or 4-20 mA output signal connection
(For DFM 27/37/47 only):
Plus (+) -------------------- pin 4 of the 25 pin "D" connector
Minus (-) -------------------- pin 17 of the 25 pin "D" connector
To eliminate the possibility of noise interference, use a separate cable entry for the
DC power and signal lines.
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