Magnetic sensors for home security systems


Magnetic sensors are two-part devices used to safeguard windows and doors. One part of the contact is a switch installed in the window or door jam; the other contains a magnet and is placed in the window or door itself. Any noticeable shift in contact with the switch results in an alarm. These can be home-run wired back to the main control panel, daisy-chained with other door/window contacts or part of a wireless transmitter combo.

This type of sensors is often used on doors to apartment buildings and secure areas in government offices. In a closed circuit system, when the door is closed, the magnet pulls the metal switch closed so the circuit is complete. The current powers the relay's electromagnet, so the buzzer circuit stays open. When you move the magnet by opening the door, the spring snaps the switch back into the open position. This cuts off the current and closes the relay, sounding the alarm.

Of all the sensors used in a home security system, magnetic sensors are the simplest and cheapest. Typical magnetic sensor in the market has a small operating gap and though it may work fine for most doors and windows in a home, it does not cut it for larger doors. Larger door such as the garage door uses a different type of sensor such as the 7113-10 TEN-PACK OF 7113 MAGNETIC CONTACT SWITCHES because of the size of the opening. This type of sensor is commonly available and here are some of the links to where you can get one.



 


Table Of Contents

How an alarm system works
Find out how an alarm system works and understand the difference between closed-circuit and open-circuit system

Control Panel
The brain of a home security system

Keypad
Keypad for home security systems

Sensors
- Motion Sensors
- Glass Break Sensors
- Magnetic Sensors
- Smoke Sensors
- Ultrasonic Sensors
- Microwave Sensors

Respond
Type of responds of a home security system

Connection
Type of connection of a home security system

DIY home security system
Guide to DIY home security system

Driveway Alarm
Your car is at home but is it safe? Is it protected by a driveway alarm?

ADT Home Security System
Home Security System Monitored By ADT

Wireless Motion Activated Security Camera
The best alternative to the conventional security camera

What Features to Look for When Purchasing a Home Security System
Guide To Purchasing a Home Security System

 

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