Garage door sensors utilize a photo eye sensor and a beam of infrared light that goes between the two units.
Polarized garage door sensor.
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The sensors are normally about 4 inches above the ground.
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One of these is the photo eye sensor which was federally mandated in january 1993.
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Whenever there is an obstruction the garage door will automatically reverse before causing any damage.
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In the past month or so the sensors seemed to be failing and at least 5 times i.
As long as the beam isn t interrupted the door will open or close normally.
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The legislation was put in place requiring garage door sensors to be placed on every garage door in 1993.
This system allows them to detect obstructions like your car or a kid on a bike.
What you will get in the package are two sensors sender and receiver sensor mounting brackets screws for installation and then an installation manual.
The units are placed near the ground on.
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Very straightforward to install.
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Also the transmit and receive sensors are interchangeable with respect to which side of the garage door they are mounted on so you don t need to worry about which one goes where.
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4 align the two beams so that the red led is on solid on both units.
To close a door with faulty sensors requires bypassing the garage door sensors.
The red led on the sender will light once.
How does the system know there is something blocking the way.
This means no matter how you connect them they will work.
The wires are not polarized so can be connected back to the sensors in any order.
When the sensors fail or become faulty the garage door opener will not close the door.
The replacement safety sensors project an invisible light beam across the inside of the garage door to prevent accidents and are required for safe use of all chamberlain garage door openers.
All openers manufactured after that date are required by federal law to have photo eye sensors.
But how do the sensors work.