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Sensor Type
Motion / PIR / Occupancy
Pet Immune
Contact Closure / Relay
Ease of Installation
Intermediate (Installs < 60 minutes)
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Pet-Immune PIR/Microwave Motion Detector Eliminates False Alarms
40 x 40 PIR/Microwave w/Pet Immunity
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40 x 40 PIR/Microwave w/Pet Immunity
40 x 40 PIR/Microwave w/Pet Immunity
Item# 76405A
Price: Normally $44.99 
Hot Deal $31.25
Free shipping on orders over $175 - See Details


  • Quad Zone Logic and highly accurate microwave technology provide pet immunity
  • Noise-reduction circuit eliminates interference from fluorescent lights and other outside noise
  • Sensor detects IR energy changes in multiple zones for accurate detection

Essential Info

Connect a dual-detection motion sensor to your security system for immediate, accurate alerts when an intruder is detected in your home. With its 40' x 40' wide angle with 80' curtain pattern, the 40 X 40 PIR/Microwave w/Pet Immunity motion detector will keep an eye on a broad area of your home when your security system is armed, and unlike many standard motion detectors, this smart sensor won't be triggered by interference or fooled by pets.


What's Included

  • Motion sensor
  • Mounting hardware
  • Instructions
  • More Info

    The 40 X 40 PIR/Microwave w/Pet Immunity motion detector offers a multitude of features that prevent it from delivering false alarms. Quad Zone Logic provides pet immunity to eliminate false alarms from objects 16 inches tall or less, while microwave technology allows free range of movement to pets up to 100 pounds. The 40 X 40 PIR/Microwave w/Pet Immunity motion detector's high-quality spherical lens and dense detection pattern give the motion detector pet immunity superior to single-technology sensors.

    This motion sensor detects IR energy changes in multiple areas and then couples them for extremely accurate detections. Quad Zone Logic provides multi-segmented detection zones over the detection area. It is designed so that a human-size target will normally fill 4 to 8 zones, and this will cause an alarm to be generated. Any smaller temperature change (i.e.: small- to medium-size pets, rodents or moving curtains) only activates one or two zones at the same time, creating a much weaker detection signal.

    Using a noise reduction current, the 40 X 40 PIR/Microwave w/Pet Immunity motion detector provides high-reliability performance against outside noise, such as electromagnetic interference and especially noise from fluorescent lights, thus solving a problem common to microwave motion sensors. Its Anti-Crosstalk System prevents interference from other microwaves if you have more than one detector in the area.

    Additional features include a sealed housing, which prevents drafts and insects from reaching the pyro element of the motion detector. If you don't need the added microwave technology, try the 40 X 40 Pet Immunity PIR Detector instead.



    Optex Product No.:MX-40PI
    Dimensions:4.53" x 2.44" x 1.97" (115mm x 62mm x 50mm)
    Weight:3.9 oz. (110g)
    Detection Method:Passive infrared & microwave
    Coverage:40' x 40' (12m x 12m), 85°
    Detection Zones:78
    Mounting Height:5' ~ 8' (1.5m ~ 2.4m)
    Sensitivity:3.6° F (2° C) at 2'/sec. (0.6m/sec.)
    Detection Speed:1' ~ 5'/sec. (0.3m ~ 1.5m/sec.)
    LED Alarm Indicator:Switchable on/off
    Alarm Period:Approx. 2.5 sec.
    Alarm Output:N.C., 28VDC, 0.2A max.
    Tamper Switch:N.C., open when cover is removed (N.C., 28V DC, 0.1A max.)
    Pulse Count:Approx. 20 sec. 2 or 4
    Warm Up Period:Approx. 1 min.
    Power Input:9.5 ~ 16V DC
    Current Draw:18mA (max.) at 12V DC
    Operating Temperature:14° F ~ 134° F (-10° C ~ 55° C)
    Environmental Humidity:95% max.
    Microwave Frequency:2.45GHz (FCC, IC, ETS300-440 approval)
    RFI Interference:No alarm 20V/m from 100MHz to 1 GHz
    Approvals:FCC compliant


    40 x 40 PIR/Microwave w/Pet Immunity       
    40 x 40 PIR/Microwave w/Pet Immunity       


    5 Ratings
    5 star: 60%  (3)
    4 star: 40%  (2)
    3 star: 0%  (0)
    2 star: 0%  (0)
    1 star: 0%  (0)
    Average Customer Rating
    (5 customer ratings)
    Share your thoughts with other customers
    MATTHEW -- turlock, CA   2/25/2010
    Works as described, fairly easy to install.
    ALAN -- racine, WI   5/5/2008
    This seems to work ok,but was a pain to install.I have it installed it my church. I did have to drill holes in the mounting plate,and cut a hole in the case edge near the bottom of the channel for the existing wires to go in as they had to go in from the bottom.It would be a good idea to have a way to make more access holes in mounting plate and at both ends of the channel.You shouldn't have to "hack" it to install it.To bad you cannot tell from the pictures in the sales literature how this stuff mounts.
    JOHN -- rancho palos verdes, CA   10/9/2006
    At first I had trouble with the motion detector not responding. However, I found that it was my error in not pointing the sensor sufficiently downward. After tiliting the sensor downward, I find that it responds propertly.
    JOHN -- rancho palos verdes, CA   9/13/2006
    These motion detectors work fine and are easy to install.


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