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Manual: 152-082010 301-305-306_303-307 Series Page 11 of 35
2.6. 4 – 20 mA Connections
The 300 Series flow meters have a 4 - 20 mA current output option available as an alternative to the
standard 0 - 5 VDC output. This current output is useful for remote applications where noise pick-up
could substantially affect the stability of the voltage output. The 4 - 20 mA signal is produced from the 0
- 5 VDC output of the flow meter and replaces the voltage output on pin 6 of the “D” connector. The
current is sourced by the flow controller and the metering circuit must sink the current, such that the
current loop is completed through power supply common connections. The load must be less than 600
Ohms. Failure to meet this condition will cause failure of the loop transmitter.
The 300 Series flow controllers have a 4 – 20 mA current input option available as an alternative to the
standard 0 – 5 VDC command input. The controller sinks the input current through a 77 Ohm load to
power supply common.
Figure 2-3
−+
−
+
−
15 VD
C
+15 VDC
Common
Pin 11
Pin 9
Pin 5,12
Analog Out
PLC or Analog I/O Card
77 Ohms
Setpoint Input, Pin 14
Analog Output, Pin 6
Analog In
Analog Return
0−600 Ohms
Hastings Flow controller
Pin
−
out H
Power
Supp
l
y
Power In
Pin 7
Ground