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Scope of use
The detection range of the detector to the active target in the warning area is a three-dimensional prevention space, which has a relatively large range and can cover a horizontal radiation angle of 60° to 90°, and the control area can reach tens to hundreds of square meters. The emission energy map of the radar microwave detector is related to the antenna structure used. An omnidirectional antenna (such as a 1/4 wavelength monopole antenna) can produce a nearly spherical or elliptical emission range. This energy field is suitable for protection. Large areas such as rooms or warehouses. The use of directional antennas (such as horn antennas) can produce a wide teardrop shape or a narrow and long teardrop shape energy map suitable for protecting narrow locations such as corridors or passageways.
The main advantage
1. High sensitivity.
2. The control range is relatively large, and its warning range is a three-dimensional prevention space, which can cover the horizontal radiation angle of 60°~90°, and the control area can reach tens to hundreds of square meters.
3. Using the microwave detector to penetrate non-metallic substances, a microwave detector can be used to monitor several rooms, and at the same time, a modification can be added for pseudo-zhuang, which is convenient for concealed installation.
Main disadvantages and precautions for installation and use
1. The probe of the microwave detector should not be aligned with objects that may be moving.
2. It is strictly forbidden to install the outer wall and outer wall of the protected room. Because microwaves are penetrating to non-metals, people walking outside the wall or vehicles driving on the road may cause false alarms.
3. There should be no oversized or excessively thick objects in the monitoring area, especially metal bodies, otherwise blind spots for detection will occur behind these objects.
4. The microwave detector should not be aligned with a gas discharge lamp source such as a fluorescent lamp or a mercury lamp. A 100 Hz modulated signal directly generated by a fluorescent lamp can cause false alarms, especially if a malfunctioning flashing fluorescent lamp is more likely to cause interference. This is because the ionized gas in the flashing lamp is more likely to be transported to the reflector by the microwave and cause a false alarm.
5. Should not be installed indoors.
6. When two or more microwave detectors need to be installed in the same room, cross interference may occur and false alarms may occur. Therefore, the frequency of microwave transmission between them should be different, generally about 25MHz, and should not be placed opposite each other.