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Your control panel is certainly an impressive (and expensive) collection of microchips, flashing LEDs, and wire However, to make the security system work, you need to be able to detect various activities There are a multitude of sensors that you can add to your security system to monitor all sorts of goings on The most common are the motion sensors and the open door sensors, but there many other things you can monitor
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Sensors are said to be normally open or normally closed This refers to the contacts inside the sensor and describes the state of the sensor For instance, a sensor that is normally closed is one that is always seen by the system as being closed When it is opened, it goes into a not ready state, and trips the alarm This type of sensor would be used on doors or windows These points of entry are typically closed, so when they are opened, the alarm is tripped The point of whether a sensor is normally open or normally closed is to indicate the normal state of the sensor Sensors can be purchased for a number of applications in either the normally open or normally closed state
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Motion sensors are devices used to detect movement in the area on which it is trained Motion sensors communicate with the control panel, sending a signal
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whenever motion has been detected If your security system is monitored by a third party, the signal from the control panel is sent to the monitoring service There are two main types of motion detectors: PIR and Dual TEC Also, if you have a pet, there are some sensors that can keep Fido from setting off the works PIR Passive infrared (PIR) motion sensors sense a change in background temperature When someone enters the room, the background (or ambient) temperature changes This change is detected by the PIR sensor, and a message is sent by the sensor to the control panel Figure 5-7 shows a PIR sensor
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Figure 5-7
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When installing PIR motion sensors, you can avoid false alarms by making sure the sensor does not have these:
Hot or cold air blowing on it Sunlight or reflected sunlight on it Intermittent heat sources nearby Pets that are likely to wander into the sensor s field of vision (more on pet immune systems in a moment)
Dual TEC A Dual TEC motion sensor uses two different ways to detect motion In addition to detecting ambient temperature changes (like a PIR sensor), it also uses Doppler to detect a moving mass A Dual TEC sensor only sends a message to the control panel if it senses both a change in ambient temperature and a moving mass By the way, if Doppler sounds familiar, that s because it s the same technology meteorologists use to predict the weather
5
Animal Immunity
If you have a pet, buying sensors that are animal immune will save a headache every time Rover or Ruggles strolls across the living room Animal immunity is able to sense between the family pet and human beings and can be built into both PIR and Dual TEC sensors Animal immune sensors are rated for pets between 25 and 100 pounds, depending on which sensor you purchase
Glassbreak
Glassbreak detectors are sensors that connect to glass doors, windows, skylights, or any other glass-covered point of entry In essence, glassbreak detectors listen for two sounds to determine whether glass has been broken First, the sensors listen for the nonaudible to humans flex sound that a window makes just before it breaks Then, it listens for the sound of the window breaking that we can hear If both of these sounds are detected by the glassbreak sensor, a message is sent to the control panel Glassbreak detectors can be purchased based on the glass type, size, and thickness, as well as the range at which they can sense glassbreaks
Carbon monoxide can come from such sources as a failing gas stove, a furnace, a fireplace, or a water heater After fires, carbon monoxide poisoning causes the greatest number of accidental deaths Whether you choose to connect this sensor to your security system or not, you should be sure to install a number of these detectors Figure 5-8 shows a CO detector
Figure 5-8
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