NM CID ES-3 Practice Questions - New Mexico CID ES-3 Low Voltage Special Systems (Under 50 Volts) Examination Exam

A passive infrared (PIR) intrusion detector initiates an alarm by sensing:

Reflected microwave Doppler shift A change in received infrared energy as a warm body moves across detection zones Ultrasonic standing-wave disturbance only Ionization of combustion particles

Correct Answer:

A change in received infrared energy as a warm body moves across detection zones

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