Magnetic Door Sensors

Basic magnetic sensors are made up of two components that are used to safeguard windows and doors. One part is installed into the window or door jam while the other contains a magnet that is placed in the window or door itself. All it takes is a shift in the contact to sound an alarm. See, in the CCTV System, when the door is closed that magnet pulls the metal switch closed so the circuit is complete. Then the current powers the relay’s electromagnet so the buzzer circuit stays open. Once you move the magnet after opening the door the spring snaps the switch back to its open position, it cuts off the current, closes the relay and sounds the alarm. These sensor systems can be used at home, wired back to the main control panel, connected to other doors and windows or they may be part of a wireless transmitter combination.

When looking into magnet sensors make sure you pay close attention to the positions, passages, presence, levels and speed. These things need to be in sync with one another while setting up the system. Magnetic sensors can be classified according to low, medium and high field sensing ranges and they are known to give accurate and reliable data without the use of physical contact. Magnet sensors are different from other detectors because they don’t directly measure the physical properties of interest. They only detect changes and disturbances in their own magnetic fields and derive information such as direction, presence, rotation, angle and electric currents.

Like I said, magnet sensors are very accurate; they measure at the pendulum and are immune to light changes. Some of the downfalls are that magnet sensors can be disturbed by other magnetic metals and the field size can affect the trip point. However all of this can be prevented with a magnetic gap. If you need to eliminate the effects of changing light situations, use the Hall Effect magnetic sensor. There are many websites and articles written describing the Hall Effect in greater detail. Basically it’s a semiconductor device that detects a magnetic field to trigger a timer. A tiny permanent magnet is placed at the tip of the pendulum to trigger the sensor, and also the Hall sensor is unaffected by ambient light.

While the magnetic field sensing technology has been driven by the needs of improved sensitivity, smaller sizes and compatibility with electronic systems, teams of scientists and engineers are working with companies to produce and market new advances everyday. So if you’re interested in magnetic sensors, speak with professionals and compare while you shop. Certain companies offer promotional products that might fit your needs. You may also consider using a home security company that includes this type of protection in their plan. This way professionals can install and set up the system without any problems. Of all sensors in the home security market, magnetic sensors are still the cheapest and simplest way to go.