Non Intrusive Current Monitor - NIC


To assist trackside applications of Network Rail’s preventative maintenance program, by monitoring currents in rail signalling problems.

How does it work?

The Nic (Non Intrusive Current Monitor) is used as part of the preventative maintenance systems on trackside applications. If the signal received from the Nic via the associated data logger to the programme output highlights the primary current variations are outside the normal limits, then it indicates there is a potential problem.

This is done when 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 stage. 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. (Note the full way rectification only applies to units for bipolar primary input current)

Features & Benefits

• Non-contact measurement of DC currents up to ±600mA.
• 4 to 20mA current output.
• Current trip with relay output.
• LED trip indicator.
• 24V DC power supply.
• Supply Reverse Polarity protection.
• DIN rail mounting.
• Unipolar versions also available.

• Enables significant reduction in manual routine inspection.
• Ability to ‘fix before failure’.
• Network Rail and SNCF approved.
• Intelligent infrastructure initiative for remote condition monitoring and proactive maintenance.