Manual Honeywell OMNI-408 (page 27 of 32) (English)

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System Limitations

While this system is an advanced-design security system, it does not offer guaranteed protection

against burglary, fire, or other emergency. Any alarm system, whether commercial or

residential, is subject to compromise or failure to warn for a variety of reasons. For example:

• Intruders may gain access through unprotected openings or have the technical sophistication

to bypass an alarm sensor or disconnect an alarm warning device.

• Intrusion detectors (e.g., passive infrared detectors), smoke detectors, and many other sensing

devices will not work without batteries or if the batteries are not put in properly. Devices

powered solely by a main power supply will not work if their main power supply is cut off for

any reason, however briefly.

• Signals sent by wireless transmitters may be blocked or reflected by metal before they reach

the alarm receiver. Even if the signal path has been recently checked during a weekly test,

blockage can occur if a metal object is moved into the path.

• A user may not be able to reach a panic or emergency button quickly enough.

• While smoke detectors have played a key role in reducing residential fire deaths, they may

not activate or provide early warning for a variety of reasons in as many as 35 percent of all

fires. Some of the reasons smoke detectors used in conjunction with the system may not work

are as follows: Smoke detectors may not sense fires that start where smoke cannot reach the

detectors, such as in chimneys, in walls, on roofs, or on the other side of closed doors. Smoke

detectors also may not sense a fire on another level of a residence or building. A second-floor

detector, for example, may not sense a first-floor or basement fire. Moreover, smoke detectors

have sensing limitations. No smoke detector can sense every kind of fire every time. In

general, detectors may not always warn about fires caused by carelessness and safety hazards

like smoking in bed, violent explosions, escaping gas, improper storage of flammable

materials, overloaded electrical circuits, children playing with matches, or arson. Depending

on the nature of the fire and/or the location of the smoke detectors, the detector, even if it

operates as anticipated, may not provide sufficient warning to allow all occupants to escape in

time to prevent injury or death.

• A passive infrared motion detector can detect intrusion only within the designed ranges as

diagrammed in its installation manual. Passive infrared detectors do not provide volumetric

area protection. They do create multiple beams of protection, and intrusion can be detected

only in unobstructed areas covered by the beams. They cannot detect motion or intrusion that

takes place behind walls, ceilings, floors, closed doors, glass partitions, glass doors, or

windows. Mechanical tampering, masking, painting, or spraying of any material on the

mirrors, windows, or any part of the optical system can reduce their detection ability. Passive

infrared detectors sense changes in temperature; however, as the ambient temperature of the

protected area approaches the temperature range of 90º to 104º Fahrenheit (32º to 40º

Celsius), the detection performance can decrease.

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Honeywell OMNI-408 Manual

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