Volt Security Systems

Power Usage of Wireless Systems   by Kate

Wireless sensors and their transmitters consume little power and their batteries often last a year or more, but the batteries used are typically the 9- or 12-volt alkaline type and are three or four times the price of 1.5-volt C or D batteries. If the batteries are used in a device that is outdoors, or on an outside wall, battery life may be reduced somewhat by extreme temperature changes. Shielding outside devices from direct sunlight is a good idea to extend the life of the unit, as well as its batteries.

Action response devices such as audible alarms, emergency call-in devices, video cameras, utility controls, and intercom speakers can also be battery powered, but are more usually wired to an AC power outlet either directly or through a stepdown transformer, which is a device that lowers AC voltage to the level required by

the equipment. It is easier to power these devices with AC current because they are nearly always located near a power outlet (appliance controls, lamp modules, and utility controls) or can be located near one (audible alarms and emergency call-in

devices). Some response devices also require quite a bit of power to perform their functions, and battery power would be expensive to provide for these.

Some AC-powered devices have battery back-up power in case the AC connection is lost or the power in the home is cut off. These are primarily warning devices such as alarms and emergency call-ins that absolutely must function properly in life-and-death situations. Backup power for these devices is critical.

Signal Transmission

Wireless sensors can transmit their signals to a security panel through walls and other obstructions within reasonable limits. The transmitters are low power and their signals are attenuated by distance. This means that their transmission range is limited to a few hundred feet. Heavy obstructions such as concrete walls, metal structures, and other dense materials can absorb some of the signal and further reduce its range. For this reason, all sensors in a wireless security system should be tested after they are mounted and the security panel is positioned in its permanent location. Testing assures that the system is working under the actual range and obstruction conditions of the home. If either a sensor or the security panel is relocated, the testing should be done again (if it is the security panel that is moved, all sensors should be retested) to be sure all transmissions can still be received.

Wireless video cameras are available for home security systems, but many of the transmitters on these units can only transmit to a receiver visible from the transmitter in a direct line of sight. For inside cameras, this is usually not a problem. It allows the camera to be located in a good surveillance position while the wireless receiver is placed in a position where it can be wired to the monitor by standard coaxial video cable.

For outside cameras, a more powerful transmitter is needed that can broadcast through obstructions (walls, etc.) to a receiver inside the home. Outside wireless video cameras can also be battery operated or connected to AC power through a transformer, if a power connection is available. Figure 9-2 shows a wireless security system that can handle both wireless and hardwired video cameras. One hardwired video camera (right) and one wireless camera (left) are shown at the front of the picture with three wireless window/door sensors, two keyless entry devices, two motion sensors and a recorder behind them, and a master control unit at the back.

This system can be connected to an Ethernet LAN and has software that allows it to be monitored remotely and securely on the Internet. It also includes wireless access points and handheld wireless remote controls.

About the Author

I’m Kate , which offers quality products such as China LED Plant Grow Lights, Feature Lighting, and many more. Know more , please visit Flexible LED Strip Light .
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