This presentation details the different types of motion sensors and each of their benefits. B.K. Electric has written each of these presentations. We have installed several motion sensors in our time and are confident we know quite a bit about them. Trust us.

1. A Quick Glance

2. Early Motion Detectors
 Early Motion Detectors weren’t machines at all, but
human beings who kept watch. They were called
sentries and often killed before they asked
questions.
A Old West
Sentry
Give me
one reason,
varmint!

3. Modern Motion Detectors
 Modern detectors detect. A bit obvious, I
know, but that’s what they’re made to do.
 It’s how they detect that defines each one.
 Most sensors have a range of 15-25 meters
and are usually connected to automated
lights or burglar alarms.

4. What Motion Sensors Are Not
 People have this idea that because of how fast technology is improving, that sensors see
and hear everything.
 But sensors can be fooled and should not be used alone. Also, they are not as interesting
to look at as some of these fictional motion sensors.
DANGER!
DANGER!

5. Passive vs. Active
 Passive detectors react to signals, such as
sound waves or heat spikes.
 Active detectors emit signals that are
reflected back to the sensor.

6. Passive Infrared (PIR)
 Passive Infrared Detectors use a sensor that detects infrared
radiation.
 The PIR considers a temperature range as “normal” and
anything else as reason to raise the alarm.
 This range is usually between 59-68°F.
 Sudden changes in temperature trip the detector.

7. Ultrasonic Detectors
 These are active sensors that emit ultrasonic waves that reflect
off objects.
 An object in motion will reflect faster because the distance
between the detector and the object is shorter.

8. Dual-Technology
 More effective than a single-type motion
sensor
 False alarms are less likely to happen
 Usually a combination of PIR and
Microwave
 Both must be activated to trip the alarm.

9. Need more help?
 Contact the electricians at B.K. Electric
Services
 (310) 430-2300
 www.bkelectricservices.com