Passive infrared & microwave motion detector : nocive ?


Hello,
I have to buy an alarm for my new house. The motion detectors exist in dual-technology (passive infrared and active detection using microwaves) or in simple technology (infrared only).
I know these detectors are continually working, even when the alarm is not activated (the red led blinking when you move) Do you know if the microwaves are also enable when the alarm is not activated ?
I'm not sure that this kind of waves are good for the health, even at low emission, when we are exposated all the year (for example, in a living-room).
Example of detector : http://www.thecrowgroup.com/files/support/SRX_2000A.pdf
Thx to give me your opinion.
Patrick.
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Patrick A. wrote:

Andy writes: The microwave systems are continually emitting microwave energy and detect intruders by the disturbances they make in the emitted fields..... They are low power, but relatively uncontrolled in level.... Personally, I wouldn't worry about the emisions, since they will be required to meet the emission standards for safety. But if you are still worried, and don't believe the standards are safe enough, you should avoid them for your own peace of mind...
The infrared sytems are passive, and detect changes in the IR emissions of objects in the room. In other words, they are simply receivers.... and are as safe as you could want.
Ultrasonic intrusion detectors emit sound waves and detect field disturbances. I don't think they are dangerous, but everyone isn't of that opinion...... One can always ask is something is safe, but it's hard to prove absolute safety for anything that puts out energy in any form...... I don't worry about it, but you might......
Just an input for you from one who has worked with all three types at one time or another.
Andy W4OAH
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