Intrusion Detection System (IDS)

The intrusion detection system (IDS) includes motion detection, glass break, and door contact sensors, among other devices. These devices provide alternative methods to

detect actual or attempted intrusion into protected areas through alarm components, monitoring, and reporting systems.

Wire intrusion devices of like technologies together within the confines of clear physical barriers not to exceed three (3) devices. Program devices in groups as an intrusion zone when they are in the same physical location and provide the same purpose.

9.3.1. Intrusion Detection Sensors Applications

The following are examples of typical application of IDS on intentional openings:

• Doors: Typically protected with door position switches with PIR motion sensors as a back-up system when necessary.

• Windows / Glazed Openings: Typically protected with glass-break sensors with PIR motion sensors as a back-up system when necessary and position switches on operable windows.

• Vents / Ducts: Typically protected with a PIR Curtain sensor.

• Video Analytics: Video analytics may be used in lieu of other identified detection technologies. Consult ECU Security when planning to use video analytics. 9.3.2. Sensor Line Supervision

Configure sensors with tamper alarms to report trouble, regardless of the state of the sensor (on or active, vs. a non-reporting status). Wire tamper alarms to the SMS as a line supervision error alarm zone. In an effort to reduce the number of alarm inputs, combine tamper alarms for sensor circuits of like technologies supporting a specific purpose within defined physical boundaries. Use end-of-line resistors for the

supervision of all alarm devices; locate the resistor at the first device in the circuit, and never at the data gathering panel (DGP) end of cabling. End-of-line resistors shall be a prepackaged unit and resistor networks shall meet manufacturer’s specifications. Resistor quality shall be standard tolerance of 1% or maximum of 1/4 Watt. 9.3.3. Mounting Heights

Show the mounting heights of all detectors on drawings or in a detail. To minimize performance degradation through vandalism, mount motion detectors, glass break sensors and cameras above reach, no less than 9 feet above finished floor (AFF) if the ceiling height permits.

9.3.4. Intrusion Zone (Arm/Disarm)

The preferred arm/disarm device for intrusion zones is keypad and LCD screen. Mount the arm/disarm device on the secured side of the zone directly adjacent to the primary entry portal. The control device shall shunt the intrusion zone trigger devices upon presentation of proper identification. Configure the entrance for an adjustable entry /exit delay.

9.3.5. Intrusion Detection Sensor Types 9.3.5.1. Position Switches

Mount position switches on the latch edge of the door, window, or opening within six inches of the latch edge. With double doors, fit each door with a separate contact sensor. Doors controlled by entry control devices require coordination of intrusion detection with authorized accesses to preclude nuisance alarms for authorized entries. Surface mounted position or balanced magnetic switches shall have armored cabling from the sensor to a junction box location adjacent to or above the opening.

Provide intrusion detection of all perimeter opening if considered an “accessible opening” per NFPA 730.

Card access controlled doors providing access to intrusion zones require a double-pole, double-throw (DPDT) door switch. Wire the first contact circuit to the shunt-able input associated with the card reader and the second contact circuit into a separate

supervised input. This procedure supports ‘Intrusion Zone’ configuration. NFPA 730 – Accessible Opening

An accessible opening has a clear cross-section area of 96 square inches or more with the smallest dimension exceeding 6 inches that conforms to the following dimensions:

• 18 ft or less from the ground or roof of an adjoining building.

• 14 ft or less from a directly or diagonally opposite window, fire escape, or roof.

• 3 ft or less from an opening, fire escape, ladder, and the like, that is in or projecting from the same or adjacent wall and leads to other premises.

Provide roll-up doors and other doors not a standard size or configuration with position switches suitable for the application. Mount position switches on both the left and right of the protected side of roll-up doors wider than six feet.

9.3.5.2. Volumetric Motion Sensors

Passive infrared (PIR) motion sensors detect a change in the thermal energy pattern caused by a moving intruder and initiate an alarm when the change in energy satisfies the detector’s alarm criteria. These sensors are passive devices because they do not transmit energy; they monitor the energy radiated by the surrounding environment. The different applications for PIR motion sensors include but are not limited to the following.

• Point: PIR Sensors can be employed so the pattern is focused on a single point such as a door, window, or a fixed object.

• Curtain: Mount a PIR sensor so it creates a field across a path (a “Curtain”). The alarm would activate if an intruder passes through the field.

• 360: Ceiling mounted PIR Sensors allow a full 360 degree range of detection. 9.3.5.3. Glass-Break Sensors

Provide 100% coverage of the boundary requiring protection by providing the number, spacing, and placement of devices in accordance with the manufacturer’s specifications. Show the area of coverage of each device on the drawings.

Provide acoustic glass break sensors or shock sensors for the protection of glass panels that meets criteria similar to an “accessible opening” per NFPA 730.

Utilize seismic sensors for situations that degrade acoustic glass-break sensor

performance such as blast windows, laminated glass, or glass with security or fragment retention film.