Using Wireless Sensors on Metal Doors
including patio doors, windows, & metal-frame openings

Wireless door sensor operation can be adversely affected when affixed to a metal door or metal-frame opening such as a patio door or window. Prior to mounting the unit, the sensor may operate flawlessly. But once applied to the metal surface, there may be little, if any, detected signal at the controller / receiver. Two possible solution options are recommended. (Trial-and-error testing may be required to determine suitable results.)

(printable PDF version)

Hint: The receiving antenna must be properly located for best reception. It should be positioned at ceiling height and oriented vertically. Ensure 3 ft. separation (minimum) from HVAC equipment, appliances, electrical equipment, conduits, plumbing, water heater, metal studs, and electronic devices. If your installation does not meet these requirements, you should promptly relocate the antenna.

Option 1: Direct attach (traditional mounting)

In many instances, the problem can be resolved with a minor relocation adjustment of the sensor (& magnet). Sometimes, an inch or two in one direction or the other can make a huge impact. (A few minutes of trial-and-error testing may be required.)

Hint: Use masking tape for temporary attachment to the intended surface until achieving the desired results. Avoid use of the 3M adhesive backing until achieving consistent and reliable results at the controller/receiver.

If results continue to remain poor or marginal after multiple re-positioning attempts, consider Option #2 below.

Option 2: Re-orient sensor (pivot method)

Sensor pivot can be effective for eliminating metal-induced interference. This method requires pivoting the sensor 90-degrees away from the metal surface. To affix the device in this modified orientation, a custom attachment is recommended. A nylon cable-tie mount works well for this purpose. Apply cable-tie mount to the sensor as shown, securing with a zip tie. Ensure the orientation allows for proper detection of the external magnet. (The magnetic sensing side should face outward, away from the mount.)

Hint: Do not apply the cable-tie’s 3M adhesive backing at this time. Instead, use masking tape for temporarily attaching the assembly (sensor + custom mount) to the intended surface, allowing for easy re-positioning. Trial-and-error tests will be necessary to determine the best locations for the sensor assembly and magnet.

If testing results remain poor or marginal, reposition the sensor assembly (& magnet), one to two inches from the current location. (Small increments are recommended.)

A single sensor-mount is sufficient for smaller sensors such as the GEN3 mini. For larger devices including the GEN3 basic sensor, dual mounts are recommended.

Before permanently attaching to the wall or frame, perform sensor registration (i.e., pairing) at the HSRS controller. (Refer to your installation mini-guide for details.) Test each sensor for consistent & reliable signal reception at the controller.

Peel away the adhesive backing and press firmly against the door or window frame. (See note #1 below.) For best results, hold in place for one minute while applying firm/steady pressure.

Notes:

1. Be sure to test the sensor for proper operation before permanently affixing to the intended surface.
2. For smaller sensors, a single cable-tie mount is sufficient. For larger devices, dual mounts are recommended.
3. Ensure the receiving antenna is installed properly for best results, i.e., positioned at ceiling height with minimum 3 ft. separation from HVAC equipment, metal shelving, plumbing, conduits, electronic devices, appliances, etc.).