NIC - Non-Intrusive Current Monitoring Units
The Non-intrusive Current Monitoring Unit (NIC) can be used in many rail applications, the main ones being:
Following customer feedback RHL have introduced a new layout for the NIC, reducing the number of parts by redevelopment of the PCB.
The cable carrying the current to be monitored is passed through the hole in the side of the case.
Internally it passes through a current transducer which outputs a voltage to the rectifier.
Following full wave rectification the signal passes through a low pass filter, the output of which connects to the 4 to 20mA current output stage.
The full wave rectification only applies to units for bipolar primary input current.
A comparator detects a desired trip level and the output is available as a relay contact output.
An internal power supply is used to convert the 24V DC supply input to power the transducer and signal conditioning circuits.