Onicon F-5500 - Wiring: Signal Wiring; 4-20 mA Loop Power Provided by F-5500

( - ) (+) ( - ) (+) ( - ) (+)
Power
12-28VDC
4-20mA Pulse
/Alarm
!
4-20mA Flow Rate or Temperature
250 ohms typical with 24VDC Power
125 ohms or less for 12VDC Power
*(see notes below)
+
-
F-5500
Customer PLC or DCS
+12 to 28VDC
12 to 28VDC Return
i
4-20mA Output Wiring: Loop Power Provided by F-5500
Bring the 4-20mA wiring in through either conduit hub. Connect the 4-20mA as
shown in the diagram below.
Fig. 3.3: 4-20mA Output Wiring for Loop Power Provided by F-5500
IMPORTANT NOTES:
• When using a 12 volt power supply, the load resistor on the 4-20mA
output must be 125 ohms or less to operate properly.
• When using 24 volt power, the load resistor is typically 250 ohms. A 250
ohm resistor in the 4-20mA circuit will result in a 1 to 5 volt signal to the
PLC or DCS.
• When using a 24 volt power supply, the load resistor on the 4-20mA
output must be 600 ohms or less.
• Some PLC and DCS equipment have built in load resistors, please refer to
the technical manuals of such equipment.
11451 Belcher Road South, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax +1 (727) 442-5699 • sales@onicon.com
F-5500 Thermal Mass Flow Meter Manual 06/17 - 2030 / 107023 Page 32
Model F-5500
WIRING
Wiring: Signal Wiring
4-20mA
Loop Power
Provided by
F-5500