Liftmaster 41a5034 replacement safety sensor beam photo eye repair kit 041a5034 5 0 out of 5 stars 2 41a5034 liftmaster sears craftsman sensor cells photo eyes garage door opener.
Garage door photo eye beam width.
Higher than that can miss many low lying objects including pets.
The other unit is a reflector.
These sensors sit either side of your garage door near the ground.
Lower is easy to stand above with a foot on either side.
If something breaks the beam while the door is closing the opener motor automatically reverses direction and opens the door.
It consists of two units installed about 4 inches from the floor on each side of the door.
The photo eye sensor is one of the most important parts of your garage door system.
The second is photoelectric.
They shoot an invisible beam between them which will sense if something is between them as it breaks the beam.
If the photo eye senses an obstruction it stops the door from closing and potentially prevents damage or injury to a vehicle.
The photo eye of an automatic opening garage door is a safety feature.