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Current Loop Connection
Sensors using current loops are widely used in industry to communicate analog signals in the presence
of electromagnetic interference. Both 2- and 3-wire current loops (often referred to as loop powered or
separately excited, respectively) are commonly used in industry. Both types of current sensors are
illustrated in this section. Internally, the
ELITEpro XC
uses 0.1% precision 499 ohm resistors to measure
the voltage drop impressed by the external current source. Current loop sensors will typically be
powered from a 24-volt DC supply. The
ELITEpro XC
has four measurement channels. The negative
terminals of each channel are common to each other and connected to the reference plane for power
measurements. For this reason it is imperative that the
ELITEpro XC
be connected as the last component
in the current loop rather than the first if multiple channels are used. Best practices are to use a single
power supply for all sensors to reduce the occurrence of ground loop current between supplies.
L1
L2
G
+
-
Sensor
Power Supply
2-Wire Current Loop Configuration
www.
.com
1.800.561.8187
Summary of Contents for ELITEpro XC
Page 58: ...58 Typical Single Phase 2 Wire Setup Diagram www com information itm com 1 800 561 8187 ...
Page 59: ...59 Typical Single Phase 3 Wire Setup Diagram www com information itm com 1 800 561 8187 ...
Page 60: ...60 Typical 3 Phase 3 Wire Delta Setup Diagram www com information itm com 1 800 561 8187 ...
Page 61: ...61 Typical 3 Phase 4 Wire Wye Setup Diagram www com information itm com 1 800 561 8187 ...
