Four-Wire Transducers; 3-Wire With External Power; 4-Wire With Datalogger Power - Campbell CURS100 Instruction Manual

FIGURE 4-5. 3-wire with external power
4.3

Four-Wire Transducers

A four-wire transducer has separate wires for power input and ground and for
signal output and ground. The signal ground may or may not be internally tied
to the power ground. Some transducers have completely isolated outputs.
FIGURE 4-6. 4-wire with datalogger power
FIGURE 4-7. 4-wire with external power
CURS100 100 Ohm Current Shunt Terminal Input Module
Datalogger
H
I
L
G
– +
Battery
Datalogger
H
I
L
G
+12 V
Datalogger
H
I
L
G
– +
Battery
Transducer
Signal
Ground
Power
Transducer
Signal
Signal Return
Ground
Power
Transducer
Signal
Signal Return
Ground
Power
7