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Environmental and Other Useful Information

While the PIR is a highly reliable intrusion detection device, it does

not guarantee against burglary. Any intrusion device is subject to a

"failure to warn" for a variety of reasons. Consider the following when

installing and setting up the PIR:

This PIR has built‐in protection to keep bugs from getting into the

sensor area and causing false alarms. Note that this protection

does not prevent insects from crawling across the lens of the PIR,

which could trigger the PIR.

Infrared energy can be reflected off any glossy surfaces such as

mirrors, windows, floors, or counter tops with glossy finish, and

slick‐finished concrete. Some surfaces reflect less than others (e.g.

the PIR can see a change in infrared energy off of reflective

surfaces even if the heat or cold source is not within the PIR

detection pattern).

Windows reflect infrared energy. They also allow sunlight or light

from other sources (e.g., cars) to pass through to the PIR. The PIR

can detect these changes in infrared energy. For example, if

sunlight passing through a window shines onto a hardwood floor

and the change in infrared energy is quick enough, the PIR can

trigger an alarm. The same applies if the PIR area includes a

window, even though the pattern of protection cannot "see"

through glass. Lights from a passing car can also pass through the

window at night and shine directly into the PIR's lens.

Heating and air conditioning ducts are also important because if

they blow air onto an object within the field of the PIR's view, the

temperature of that object could change quickly enough for the

PIR to "see" a change in infrared energy. PIR's cannot see air

current, only the change in temperature of a physical object.

The PIR senses change in temperature. However, as the ambient

temperature of the protected area approaches the temperature

range of 95° to 120° F, the detection performance of the PIR

decreases.

Ensure that the area you wish the PIR to cover is free of

obstructions (for example, curtains, screens, plants, and so on.)

that may block the pattern of coverage.

Anything that can sway or move due to air current can cause a

change in infrared energy within the fields of view. Drafts from

doors or windows can cause this to happen. Plants, balloons,

curtains, and hanging baskets should never be left in the PIR's field

of view.

Do not mount the PIR on a surface that allows for any vibration.

Vibrations not only cause the PIR to move a little, but it also

causes the fields of view in a room to move with respect the PIR. A

little vibration can cause havoc with the PIR's field of view, thus

the PIR may see a change in energy and trigger the alarm.

An installation often requires that the PIR is aimed at the door.

The PIR may detect door movement before the door contact can

initiate an entry delay, causing the alarm to trigger. If you install

the PIR facing a door, then while programming the PIR, choose an

appropriate sensor/zone type.

The PIR ONLY detects intrusion within the pattern of coverage.

The PIR does not provide volumetric area protection.

The PIR creates multiple beams of protection. Intrusion can only

be detected in unobstructed areas covered by those beams.

The PIR cannot detect motion or intrusion that occurs behind

walls, ceilings, floors, closed doors, partitions, glass doors, or

windows.

Tampering with, masking, painting, or spraying of any material on

the PIR lens or any part of the optical system can impair detection

ability.

The PIR, like other electrical devices, are subject to component

failure. Even though the PIR is designed to last as long as 10 years,

the electronic components are subject to failure.

Lens Pattern and Tilt Angles

The diagrams below show the lens pattern and tilt angles for the PIR

in meters.

Figure 5 Lens Pattern—Top View

Figure 6 Tilt Angle—Side View

‐9°

PIR titled down one click

0°

PIR facing the opposite wall (Direct‐to‐wall or mounting bracket with no

tilt adjustment.

‐18°

PIR tilted down two clicks

+9°

PIR tilted up one click