Door Sensor

Locking the door when you leave the house is just common sense, isn’t it? But you may be surprised to know how often people simply leave their front door open, or worse, how even state of the art locks may not be enough in most cases. After all, 34% of burglars enter through the front door, one way or another, and even with the most sophisticated home security system, your protection is incomplete without first securing that front door. (A Secure Life)

There are plenty of ways to burglarproof your doors, however one of the simplest yet effective ways to better secure your first line of defense could be to install door sensors. If you want to learn more, then the following information could be useful.

How it Works

Door sensors, also known as door contacts, are usually designed as small rectangular units, which may be easy to install and mounted out of sight on the door’s framework. When an intruder opens the door, the connection between the sensors should break, triggering an alarm.

The system consists of three main components:

  • A magnet which holds together an electric circuit in its magnetic field

  • A transmitter which senses when the electric circuit has been broken

  • A receiver which triggers the alarm

The magnet is usually secured on the door’s frame parallel to the transmitter at a distance of around half an inch, while the transmitter may be fitted on the wall, closest to the door. The sensors may even be hidden in the door and doorjamb.

The receiver may either be located in a hard-wired security system panel or a battery-operated wireless receiver. A hard-wired system may, therefore, need professional installation, whereas you could set up the wireless system yourself. Some door alarm systems may also have additional settings besides basic on-off functions, such as using the sensor as a door ring as well as an alarm.

Questions to First Ask Yourself

Before installing door sensors, you should thoroughly assess all your main entry doors to properly understand your security needs. Some of the questions you may want to ask yourself are:

  • What kind of doors do you have? You may have to get added protection for specially designed doors such as French doors.

  • Are they in good condition, with strong frames and hinges? If not, get them fixed as soon as possible.

  • Do the locks and keys properly work? If they don’t, consider replacing them with better locks or keys such as deadbolt locks.

  • Do your doors have glass panels? If so, consider replacing the glass with a laminated one or window security film.

  • Do you have glass sliding doors? While they let plenty of sunlight in, make sure that they can be locked properly.

  • Do you hide your spare key outside your door? This can be extremely dangerous, especially if anyone else finds out.

  • Do you have pet doors and mail slots on your door? Consider getting an electronic pet door or fitting a secure box behind the mail slot.

Now this may sound strange but walk around the premises and take a good look at your house from the outside; think like a burglar. You may notice how the shrub in front of your door provides convenient cover to a potential burglar.

Remember, it’s better to be safe than sorry, but whatever type of door you have or whatever your lifestyle, you may be sure that at least with door sensors you have an additional layer of security to keep your home safe from burglars.



Q:Can you tell me how door sensors work?

A:There are two parts of the doors sensors, one fits onto the door while the other is attached to the frame. You will need to position these two pieces next to each other because they interact. When these two pieces of the sensor are separated from each other, they send a signal to the alarm panel, showing that the door has been opened by a force.

Q:My garage door isn't closing properly since I installed a door sensor. How can I solve my door sensor problem?

A:There could be a number of reasons why your garage door isn't closing after you installed the door sensor. Sometimes, the door sensors are misaligned and do not let the door close properly. Another reason could be a warped, clogged, or a loose track. Plus, sometimes the garage door needs to be lubricated with lithium grease to function properly.

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