Badger Meter Converters - Manual (Page 8)

F
to
I
Converter
24V DC
Power
Supply
4…20 mA
1000
Ohms
Figure 5: Power supply calculation example 2
Known values are:
Total Load Resistance = 1000 Ω
Power Supply = 24V DC
At 20 mA loop current, the voltage drop across the load(s) is:
1000 Ω x 20 mA = 20,000 mV (20 Volts)
Subtract 20 volts from the 24 volt source to determine that 4 volts is available to power the F to I converter The 4 volts is
below the specified 10…30 volt range and is not sufficient to power the F to I converter
In this instance either the supply voltage must be increased of the load resistance decreased
Signal Conditioner, Intelligent Frequency Converter
Page 8 November 2013