1. Dual-function security glass window
This security window has dual functions: (1) glass breakage alarm; (2) Open the window and give an alarm. The cost of each glass window is only 60 yuan, plus the cost of wired or wireless transmission equipment, which is about 1.800 yuan lower than that of the stainless steel security window outside the three windows.
Replacing security window with iron net on the bottom floor of 342 building in a residential area is practical in design and has good effect. This kind of security window is coated with passive conductive film, which is attached to the edge of the glass, but pressed in the window frame, and will not be affected by the wind and rain when wiping the glass. The glass plane is regarded as a wire, which is connected to the wired transmission alarm system through a two-node contact switch, so that the user can't see any alarm devices around the doors and windows. Pushing and pulling plastic-steel windows or the balcony sliding door requires glass installation.
2. Double-beam fence passive infrared detector
This detector, commonly known as "electronic curtain", is suitable for the protection of balcony doors and windows. Installed on the top of the balcony, it can distinguish between the owner coming out of the house (not giving an alarm) and the thief invading from the balcony (giving an alarm), thus saving the trouble of the owner's "fortification", "disarming" and "false alarm". The installation height is 2.5m, the width is 1m, the length is 6m, and the owner can go back and forth.
3. Active infrared radiation detector
One end of active infrared emits single, double or four infrared beams, and the other end is received by the receiver.
The distance of the detector formed by this reception is 5- 10-20-30-40-250 m, and the same specification is usually three times of the outdoor working distance. It is also a common choice for theft prevention of outdoor doors and windows, especially for residential buildings without external walls, which can be set on the grass downstairs. It can also be set on the basement/garage floor to protect doors and windows. Pay attention to the false alarm caused by infrared crossfire in snow, rain, fog and electrical noise.
4. Passive infrared fence detector
If the detector is installed at a height of 4m, there are two differential beams with a width less than 0.5m/ 1m at a distance of 12m. The range of 0-6m below the detector is an invisible blind area for people below 2m. When the ambient temperature in the south is close to human body temperature, the passive infrared discrimination ability is poor. It is especially suitable for application in areas where there is a big difference between the ambient temperature and the human body temperature in the north.
5. Window magnetic switch and door magnetic switch
The alarm switch has been used for a long time, which is to install the switch on a fixed window frame or door frame and the magnet on the corresponding position of the movable door or window. There are many installation methods such as embedded type and surface sticking type, which are suitable for the prevention of steel, wood, steel and plastic doors and windows, with low price and good reliability, but the disadvantage is single function.
6. Glass breakage alarm
Many imported "glass breakage alarms" are usually installed on the wall or ceiling, and are sensed by ultrasonic waves of glass breakage. It is difficult to distinguish various sounds such as broken indoor glass, telephone ringing, alarm bell, hot water kettle ringing, outdoor knocking, whistle, motor sound, etc. Therefore, computer characteristic acoustic shock identification C&; Amp technology and software-controlled DSP to distinguish authenticity. K company and others have better products, which are easy to install, but they are not suitable for ordinary houses in terms of price. This is an important and quiet indoor preventive measure.
There are also some "glass breakage alarms" attached to the corner of the glass window. They are active sensors using the broken vibration of glass, which are small in size and difficult to adapt to the long-term use of ordinary residents.