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INTRUSION ALARM TECHNOLOGY

INTRUSION ALARM TECHNOLOGY. NOTIFICATION DEVICES. INTRUSION ALARM TECHNOLOGY. Annunciation or notification devices communicate information about an intrusion system to its user. The information can be communicated visually, audibly or both.

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INTRUSION ALARM TECHNOLOGY

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  1. INTRUSION ALARM TECHNOLOGY NOTIFICATION DEVICES

  2. INTRUSION ALARM TECHNOLOGY • Annunciation or notification devices communicate information about an intrusion system to its user. • The information can be communicated visually, audibly or both. • Annunciation is communicated through the keypads by the use of chimes and buzzers as well visual messages.

  3. INTRUSION ALARM TECHNOLOGY • Notification is achieved through the use of sirens, bells, horns and strobes. • Annunciation alerts a user of a status change, for example when arming or disarming a system you will here a chime and see an alphanumeric message.

  4. INTRUSION ALARM TECHNOLOGY • Common notification devices used in alarm systems are horns and sirens.

  5. INTRUSION ALARM TECHNOLOGY • Horns and sirens should be concealed so that they can not be defeated. • In residential dwellings placing a horn in the attic will resonate loud enough for neighbors to hear and it will be difficult to get at. • Another option is to hide a horn or siren in the floor rafters in the basement.

  6. INTRUSION ALARM TECHNOLOGY • For commercial installs horns are placed in steel boxes that are vented to allow the sound to propagate throughout the vicinity. • The steel boxes also have a tamper switch connected to the cover so that it can’t be disabled without setting of an alarm.

  7. INTRUSION ALARM TECHNOLOGY • Tamper switches are also detection devices, they are spring loaded plunger style switches. TAMPER SWITCH WHEN THE DOOR IS OPENED THE PLUNGER SPRINGS FORWARD OPENING THE LOOP AND ACTIVATING AN ALARM.

  8. INTRUSION ALARM TECHNOLOGY • One horn or siren can cover approximately 5000 square feet, of course during system testing you will determine if the horn is loud enough to alert neighbors. • The horn should have a minimum decibel level of 85dBA to 95dBA which is comparable to a smoke alarm.

  9. INTRUSION ALARM TECHNOLOGY • Another option for notification is alarm sounders, sometimes referred to as screamers these units are smaller and can be recessed into walls. SURFACE MOUNT SOUNDER FLUSH MOUNT SOUNDER

  10. INTRUSION ALARM TECHNOLOGY • Multiple alarm sounders can be installed throughout the residence or small business to effectively alert the occupants and deter intruders. • Sounders are also available with a light/strobe feature built into the unit.

  11. INTRUSION ALARM TECHNOLOGY • If several sounders are used they are wired in parallel. • Sirens, horns and sounders come with short pigtails so these connections are spliced onto an 18/2 CL2 cable.

  12. INTRUSION ALARM TECHNOLOGY • The use of horns and sirens may require a siren driver circuit. • This circuit is now part of the majority of control panels, however if you’re adding multiple sirens you will need more power to drive the additional sirens.

  13. INTRUSION ALARM TECHNOLOGY • Siren drivers come in many different shapes and sizes, check with your vendor for the siren driver that is compatible with your particular CP. 40195 SIREN DRIVER: DRIVES 2 X 10W HORN SPEAKERS AT 112DB FROM A 12VDC SOURCE

  14. INTRUSION ALARM TECHNOLOGY THE DRIVER’S 12V CONNECTION IS WIRED TO THE SIREN OUTPUT ON THE CONTROL PANEL, AN 18/2 IS CONNECTED TO THE SIREN TERMINALS ON THE DRIVER.

  15. INTRUSION ALARM TECHNOLOGY • Strobes are usually installed with horns as part of a complete notification system. • When these devices are installed outside they should be at a height that is difficult to reach without using a ladder. 12/24VDC 200mA/120mA

  16. INTRUSION ALARM TECHNOLOGY • Strobes for security systems are blue or orange, red is reserved for fire alarm. • Local codes dictate what color can be used and how long it can flash.

  17. INTRUSION ALARM TECHNOLOGY • When installing the cable for both the horn and strobe 18/4 is probably your best choice. • The two extra conductors can be used for the tamper switch, 18/6 should be used if all three devices are needed. STROBE TAMPER HORN

  18. INTRUSION ALARM TECHNOLOGY • Horns and sirens should sound for no more than five minutes, an additional five minutes is acceptable if another detection device is tripped. • Local codes will dictate what is acceptable for siren sounding lengths, five minutes is an industry standard.

  19. INTRUSION ALARM TECHNOLOGY • Some alarm systems incorporate pre-recorded messages and may also have a two way audible communication link. • This would allow an operator at a monitoring station to talk directly to a user on the premises or warn an intruder that the police are on the way. • This link is usually established through the keypads.

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