Badger Meter Converters - Manual (Page 6)

CONNECTION
The 4…20 mA output can drive auxiliary devices (resistive loads) such as displays, recorders and computers, provided that the
voltage supplied by the power supply is adequate Devices must be wired in series with the F to I converter and power supply
The voltage drop across the load(s) and the 6V DC minimum needed to drive the F to I converter determine the minimum
voltage required from the power supply
Determine the necessary voltage required to adequately drive the F to I converter and auxiliary device(s)
The F to I converter acts as a current controlling device Thus, the current output remains the same even if the power supply
voltage fluctuates or the load resistance changes The current varies only with respect to the flow rate from the turbine flow
meter, as long as the voltage drop across the F to I converter is at least 6V DC
The load(s) in the circuit will generally have some electrical resistance, 100 ohms for this example The 4…20 mA loop current
will produce a voltage drop across each load The maximum voltage drop across a load(s) will exist when the loop current is
20 mA The power supply must provide enough voltage for the load(s) plus the 6V DC minimum insertion loss of the
F to I converter
OTEE: N See examples on Power Supply Calculations on page 7
Refer to the wiring diagram in Figure 1 or Figure 2 that corresponds to the converter that you have selected for your
application
1
3
2
4
5 BA
4-20 mA
Loop
Powe r
+
1
3
2
4
5 BA
0…5V DC
Output
10…26V DC
Input
Gnd.
1
3
2
4
5
No Connection
4-20 mA (-)
4-20 mA (+)
Turbine
Pickup
1
3
2
4
5
10…26V DC Input
0…5V DC Output
Ground
Turbine
Pickup
Figure 1: F to I wiring diagram Figure 2: F to V wiring diagram
Signal Conditioner, Intelligent Frequency Converter
Page 6 November 2013