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Contact-Closure Sensor

Heavy duty contact-closure sensor for general industrial applications


Monitor chain link gates, safes, walk-in freezer, doors, etc. These rugged industrial contact sensors are triggered by the proximity of a magnetic field (magnet included). They are weather resistant and offer a wide temperature operating range (-40F to 257F). They come with a 36" armored cable to resist vandalism.

Magnetic Sensor Wiring Diagram

The GRI-4402-A offers SPDT form C contacts so they can be used in open or closed loop circuits. The illustration below shows the sensor wired as a N/O circuit.

Magnetic contact sensor wiring diagram

Locations for Vin+ and In1+ may vary depending on ControlByWeb modules

Gate Monitoring with ControlByWeb Products

The GRI-4402-A can be connected to any ControlByWeb product with a digital input. When the magnet is within proximity of the sensor switch, it will apply a voltage to the digital input, turning it ‘On.’ When the input changes, ControlByWeb module can be configured to send email/text alerts, control remote relays (for alarms at a remote location), and/or log events.

Gate control with ControlByWeb Modules

Click to learn more about gate monitoring & control


  • Mountable up to 2 1/2" apart
  • Contact Form: C
  • Circuit Types: Open/Closed
  • Left or Right Installation
  • 3 ft Armored Cable

  Compatible Products

The 4402-A is compatible with all ControlByWeb® products that have a digital input.

Gate Contact-Closure Sensor

In Stock




Maximum Switching Voltage/Current: 175VDC/0.250A

Circuit Types: Open/Closed



Please contact our sales department for quantity discounts.




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