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

Wireless sensors are widely used and extremely convenient for door monitoring. Avoiding costly cable runs and unsightly wires, these sensors utilize radio-frequency signals for transmitting door status to a receiver/controller. In most cases, wireless messaging is consistent and reliable. But in a handful of instances, a metal door can diminish wireless sensor signals, mildly for some, or severely for others. Fortunately, a simple positioning adjustment can be hugely effective. If your installation suffers from weak or marginal signal reception, consider two possible options for resolving the issue.
 

(printable PDF version)

Hint:

• The receiving antenna must be properly located for best reception. It should be positioned at ceiling height or above, and oriented vertically. Ensure 3 ft. (minimum) separation 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)

Using nylon cable-tie mounts (with zip ties): GEN3 mini-sensor & basic sensor

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.).