Solenoid Coil Monitor



  • Monitors the connected solenoid and associated field wiring continuously.
  • Detects faulted conditions which can occur in a solenoid coil prior to attempted operation.
  • Detects broken wires, shorts, and power losses.
  • Reduces maintenance and troubleshooting by indicating the type of fault.


  • Stand-alone unit designed to monitor conditions while the coil is de-energized.
  • No additional or special wiring is required between module and solenoid.
  • Seamless integration with programmable logic controllers.
  • DIN rail mounted


The PRETECH Solenoid Coil Module monitors the coil and associated wiring continuously.  While the coil is normally de-energized, a small monitoring signal passes through the coil to monitor for variations.  By this means, the solenoid and field wiring are monitored for open-circuits and short-circuits which would otherwise prevent proper operation.  If a command is received to operate the coil, the internal double pole relay changes state to supply the full operating voltage to the coil.  This control source is compatible directly with most programmable logic controllers and can either be DC voltage or a dry contact.

This module offers the additional feature of monitoring the availability of the main power source necessary for energizing the solenoid.  Should power become unavailable at any time, a fault will alert the necessary system or operator that the solenoid cannot be energized if commanded.

The LED display is color coded for easy troubleshooting of faults and conditions.


  • Fault contact to communicate the coil, wiring, or main power has failed 
  • Active contact to communicate that the solenoid coil has activated
  • Control power source to communicate signal to activate solenoid
  • Main Power Source which provides the module with the rated voltage necessary to actuate solenoid
  • 12Vac monitoring power source.

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Solenoid Coil Monitor Wiring Diagram

Example wiring diagram


Our modules can monitor almost any solenoid!  Our engineers will review all data and ensure the solenoid coil is properly protected!

Part Number Selection


Other voltages available.  Contact us for more information!

Contact Ratings


Other contact ratings available.  Contact us for more information!

Contact Us

Let us make things easy for you. Provide the solenoid valve manufacturer and part number. We'll outline a monitoring solution for you.

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Phone: 1-888-554-0445