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• A user may not be able to reach a panic or emergency button quickly enough.
• Passive infrared motion detectors can only detect intrusion within the designed
ranges as diagrammed in the motion detector's installation manual. 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 90° to 105°F, the detection performance
can decrease.
• Even if the system responds to the emergency as intended, however, occupants
may have insufficient time to protect themselves from the emergency situation. In
the case of a monitored alarm system, authorities may not respond appropriately.
This equipment, like other electrical devices, is subject to component failure. Inadequate
maintenance and failure to test are the most common causes of alarm failure. It is
strongly recommended that you test your system once a week to be sure that
all system components are working properly. See the System Testing section on
page 60 for information on how to test your system.
Although having an alarm system may make you eligible for reduced insurance
premiums, the system is not a substitute for insurance. Warning devices cannot
compensate you for loss of life or property.
If your system includes wireless devices, beware of the following limitations:
• Wireless devices will not work without power. Battery-operated devices will not
work without batteries, with dead batteries, or if the batteries are not put in
properly.
• Wireless transmitters are designed to depend on batteries that have a limited life.
Longevity of batteries may be as much as 4 to 7 years, depending on the environ-
ment and usage. The wireless system will alert you to low battery situations, thus
allowing you time to arrange a change of the battery to maintain protection for that
given point within the system.
• Signals sent by wireless transmitters may be blocked 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.
• In some situations, a wireless panic button may have a signaling range of several
hundred feet from the protected home. Emergency personnel will respond to the
address of the protected home. A user who activates a wireless panic button may
be too far away from the protected home to be located by responding emergency
personnel.
Wireless Device Limitations
9
74-2760—1
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