Hubbell CLT1554 Home Security System User Manual


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5
How to Select the Right Technology
for the Proper Application
Passiveinfrared(PIR)technologysensesoccupancybydetectingthemovement
of heat emitted from the human body against the background space. Unlike US
technology,PIRsensorsrequireanunobstructedline-of-sightfordetection.These
sensorsuseasegmentedlens,whichdividesthecoverageareaintozones.
Movementbetweenzonesistheninterpretedasoccupancy.PIRsensorsareideal
fordetectingmajormotion(e.g.walking),andtheyworkbestinsmall,enclosed
spaces with high levels of occupant movement.
Benefits:
•Longrangedetection
•Reliabletriggering
•Costefficient
Passive Infrared
(PIR)
Ultrasonic(US)technologysensesoccupancybybouncingsoundwaves(32kHz
-45kHz)offofobjectsanddetectingafrequencyshiftbetweentheemittedand
reflected sound waves. Movement by a person or object within a space causes a
shiftinfrequency,whichthesensorinterpretsasoccupancy.WhileUSoccupancy
sensorshavealimitedrange,theyareexcellentatdetectingevenminormotion
suchastypingandfiling,andtheydonotrequireanunobstructedline-of-sight.
This makes US technology sensors ideal for an application like an office with
cubicles or a restroom with stalls.
Benefits:
• Detectsmallmotion
• Seesaroundobstructions
• Costefficient
Ultrasonic (US)
Dualtechnologyoccupancysensorscombinebothpassiveinfrared(PIR)and
ultrasonic(US)technologiesformaximumreliability.BecauseUSandPIRneed
tobothdetectoccupancytoturnlightingon,dualtechnologysensorsminimize
the risk of lights coming on when the space is unoccupied—false triggering.
Continued detection by only one technology then keeps lighting on as necessary.
Dualtechnologysensorsofferthebestperformanceformostapplications.
Benefits:
• Trackoccupancyonwithtwosensingmethods
• Minimizesfalsetriggering
• Consistent,reliableoperation
Dual Technology
www.hubbell-wiring.com
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