How to Install an Ajax DoorProtect Sensor | Step-by-Step Installation Guide

How to Install an Ajax DoorProtect Sensor

The Ajax DoorProtect is a wireless magnetic opening detector designed to protect doors, windows, cabinets, overhead doors, and other entry points. Using Ajax's Jeweller wireless communication technology, DoorProtect instantly reports when a protected opening is opened, helping secure your home or business.

This guide explains how to pair, install, and test your DoorProtect sensor for reliable operation.

Before You Begin

Before installing your DoorProtect sensor, make sure you have:

  • An installed and operational Ajax Hub
  • Administrator access to the Ajax Security System app
  • Ajax DoorProtect sensor
  • Mounting screws
  • Phillips screwdriver
  • A clean mounting surface

If your system is professionally monitored, place it in test or maintenance mode before adding new devices.

Step 1: Open the Ajax App

Launch the Ajax Security System app.

Select the appropriate hub.

Tap Devices.

Select Add Device.

Step 2: Add the DoorProtect

Enter the following information:

  • Device name (Example: Front Door)
  • Select the room
  • Scan the QR code located on the detector or packaging

Each DoorProtect sensor has a unique QR code used to pair it with the hub.

Step 3: Power On the Sensor

Remove the detector from the packaging.

Press and hold the power button until the LED flashes.

Within a few seconds, the detector should appear in your device list.

Step 4: Choose the Correct Magnet

DoorProtect includes two magnets.

Small Magnet

Use when the detector and magnet will be mounted very close together.

Large Magnet

Use when a larger gap between the detector and magnet is required.

Always use only one magnet.

Step 5: Select the Mounting Location

The larger portion containing the electronics is the detector.

The smaller piece is the magnet.

For proper operation:

  • Mount the detector on the fixed portion of the door or window frame.
  • Mount the magnet on the moving portion (door or window).
  • Position the magnet on the side of the detector marked with the magnet symbol.
  • Keep the magnet aligned with the detector when the door or window is closed.

Proper alignment is critical for reliable operation.

Step 6: Verify Magnet Distance

When the protected opening is closed, the magnet must be within the maximum operating distance specified by Ajax.

If the gap is too large, the detector may not recognize that the door or window has closed.

Before permanently mounting the sensor, verify that opening and closing the door changes the detector status correctly in the Ajax app.

Step 7: Test Jeweller Signal Strength

Before mounting the detector permanently, perform a communication test.

Open the detector settings in the Ajax app.

Run the Jeweller Signal Strength Test.

A strong signal helps ensure reliable communication with the hub.

If signal strength is poor, relocate the detector or consider adding an Ajax ReX range extender.

Step 8: Mount the Detector

Once communication has been verified:

  • Secure the SmartBracket mounting plate using the supplied screws.
  • Attach the detector to the mounting plate.
  • Mount the magnet in the correct position on the moving portion of the door or window.
  • Verify that both pieces remain aligned when closed.

Using screws is recommended for permanent installations.

Step 9: Configure Sensor Settings

The Ajax app allows you to customize several DoorProtect settings, including:

  • Entry delay
  • Exit delay
  • Night Mode operation
  • Always Active mode
  • Chime notifications
  • Alarm processing
  • External wired contact support (if used)

Configure these settings based on how the protected opening will be used.

Step 10: Test the Installed Sensor

After installation:

  • Close the protected opening.
  • Arm the security system.
  • Open the door or window.
  • Verify the detector reports the event immediately.
  • Confirm mobile notifications are received.
  • If professionally monitored, verify alarm communication with your monitoring center.

Testing confirms the sensor is functioning properly before placing it into regular service.

Common Installation Mistakes

Avoid these common installation errors:

  • Mounting the detector on the moving portion of the door
  • Installing the magnet on the wrong side of the detector
  • Using both magnets at the same time
  • Allowing excessive gap between the detector and magnet
  • Skipping the signal strength test
  • Using adhesive tape for permanent installations
  • Failing to test the sensor after installation

Frequently Asked Questions

Where should the DoorProtect detector be installed?

The detector should be mounted on the fixed portion of the door or window frame, with the magnet mounted on the moving portion.

Which magnet should I use?

Use the small magnet when the detector and magnet can be installed close together. Use the larger magnet only when additional spacing is required.

Can DoorProtect protect windows?

Yes. DoorProtect is designed for both doors and windows and can also protect cabinets, storage rooms, overhead doors, and other openings.

Does DoorProtect require Wi-Fi?

No. DoorProtect communicates directly with the Ajax Hub using the Jeweller wireless protocol.

How long does the battery last?

Under normal operating conditions, the battery typically lasts up to 7 years, depending on usage and environmental conditions.

Final Thoughts

Ajax DoorProtect sensors provide reliable perimeter protection for doors and windows while offering quick installation and long battery life. Proper alignment of the detector and magnet, combined with signal strength testing and system verification, helps ensure dependable operation for years to come.

Once installed, your DoorProtect sensor becomes an essential part of your Ajax security system, providing immediate notification whenever a protected entry point is opened.