Lesson 4 Lesson 4 Physical SecurityPhysical Security

-Motion SensorMotion Sensor-Passive Ultrasonic SensorPassive Ultrasonic Sensor-Photoelectric SystemPhotoelectric System-UltrasonicUltrasonic-Ultrasonic Motion SensorUltrasonic Motion Sensor-Vibration SensorVibration Sensor

Purposes of intrusion detection Purposes of intrusion detection alarm system are:alarm system are:

- To economizeTo economize- To substitute in place of other To substitute in place of other

security measures.security measures.- To supplement by providing To supplement by providing

additional controls.additional controls.

Basic principles of operation of Basic principles of operation of intrusion detection system are:intrusion detection system are:

- Breaking an electrical circuit.Breaking an electrical circuit.- Interrupting a light beam.Interrupting a light beam.- Detecting sound.Detecting sound.- Detecting vibration.Detecting vibration.- Detecting a change in capacitance Detecting a change in capacitance

due to penetration of an electrostatic due to penetration of an electrostatic field.field.

Types of alarm systems:Types of alarm systems:

- Metallic foil or wireMetallic foil or wire- Photoelectric or electric eyePhotoelectric or electric eye- Audio detection devicesAudio detection devices- Vibration detection devicesVibration detection devices- Microwave motion detection deviceMicrowave motion detection device- Ultrasonic motion detection devices Ultrasonic motion detection devices - Capacitance of electrostatic Capacitance of electrostatic

detection devicedetection device

Other SensorsOther Sensors

- Penetration sensors Penetration sensors - Used on windows, doors, ceilings, walls Used on windows, doors, ceilings, walls

and other entry areas.and other entry areas.

- Duress sensor - Duress sensor - It is used to call for assistance of other It is used to call for assistance of other

personnel.personnel.

Types of alarm detection Types of alarm detection systems are:systems are:

- Local alarm systemLocal alarm system- Auxiliary systemAuxiliary system- Central station systemCentral station system- Proprietary systemProprietary system

Three basic parts of an alarm Three basic parts of an alarm system:system:

- Sensor triggering device.Sensor triggering device.- Circuit which carries message to the Circuit which carries message to the

signalling apparatus.signalling apparatus.- A signalling system or device, A signalling system or device,

sometimes called “Annunciator”.sometimes called “Annunciator”.

Function of an alarm system Function of an alarm system could be one or more of the ff:could be one or more of the ff:

- Detection of fire.Detection of fire.- Detection of intrusion.Detection of intrusion.- Emergency notification.Emergency notification.- Monitoring of equipment or facility Monitoring of equipment or facility

conditions. conditions.

90%-98% of all alarms are false.90%-98% of all alarms are false.

Most common causes of false Most common causes of false alarms are:alarms are:

- User negligence.User negligence.- Poor installation or servicing.Poor installation or servicing.- Faulty equipment.Faulty equipment.

Monitoring systems.Monitoring systems.Closed circuit television (CCTV) Closed circuit television (CCTV)

system consists of the ff:system consists of the ff:- Television cameraTelevision camera- A monitorA monitor- Connecting circuitsConnecting circuits- Power sourcePower source

Western Burglar And Fire alarm Western Burglar And Fire alarm AssociationAssociation

- Self system right.Self system right.- Don’t used space protection Don’t used space protection

indiscriminatelyindiscriminately- Instruct subscriber on proper use of alarmInstruct subscriber on proper use of alarm- Reinstruct subscriber at frequent intervalsReinstruct subscriber at frequent intervals- Train & retrain alarm company employees Train & retrain alarm company employees

on procedureson procedures- Maintain system in proper working Maintain system in proper working

condition.condition.

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