Focus on the difference between the commonly used analog surveillance cameras and the choice of the current market is the cheapest surveillance camera is a 420-line camera, the prices are in more than 100 yuan, followed by high-end is 480 lines, 540 lines, 600 lines, 650 lines, 700 lines; the same line of chips generally have two kinds, one is SHARP, the other is SONY, individual LG, or other brands; in the sensor is divided into CCD and CMOS two. So many models choose surveillance cameras? Simple, the best in today's analog surveillance camera is the SONY700 line CCD picture is the most clear, the price will be relatively high, the next point is the SONY650 line CCD, and then the overall effect of SHARP than SONY (the same line element In the case of), some are worse; but some businesses mislead consumers and often use the name of â€œhighlineâ€ to advertise â€œHDâ€. Letâ€™s not just look at how many lines there are, because now there are 700 lines of CMOS, but the price It's about half as cheap as a CCD. The effect is that it looks like it has changed, but with the CCD, you'll be disappointed. Therefore, if you choose the surveillance camera, if you choose medium effect, I recommend that you choose SONY600 line CCD. If you are pursuing high-definition, you don't have to choose SONY700 line CCD directly. Then you need to choose whether you want infrared or infrared. Infrared is now basically universal. Array infrared, a high-power infrared light than the traditional infrared light even more than several times the loop effect, now commonly used gun-type machine equipped with array infrared light single, two, three, four points, single Can see 20 meters no problem, two more than 30 meters, for example: array infrared camera FS-5100T series (700 lines)
By analogy, if it is a dome camera, then there are more than a dozen arrays of infrared lamps, infrared effects up to 60-100 meters, so the night vision effect of the camera is greatly improved. Security in Dongguan has substantially declined in the past two years. Everyone knows that companies that have not yet installed monitors are not too many. Basically, they look forward to seeing cameras anytime, anywhere, but most of the cameras are also used for three to five years. Many of them are aging. The effect is ambiguous and gradually faces elimination and replacement. Therefore, the newly installed Dongguan monitoring project is not much, but there are a lot of projects for replacement or rectification. I hope everyone will no longer blindly choose when choosing a camera, and learn to choose the simulation in the monitoring system. Camera.
Description:Made of excellent kevlar fiber with natural rubber and other chemical materials.Formed by rolling after special mixture treatment.It is mainly for such media as water and vapor and applicable to sealing and heat-insulation used in the industries as machinery, automobiles, farm, machinery and petroleum.
Usage:Suitable for ordinary water caliduct equipment and low pressure.for water and steam transmitted in the joints of facilities and pipelines.
Density g/cm3 1.6~1.8
Tensile strength â‰¥Mpa 7
Compressibility â‰¥ % 12+/-5
Recovery â‰¥ % 40
Aging Coefficient 0.9
Stress Relaxation â‰¤% 45
Steam Sealing Tmax: 200 â„ƒ Pmax:2~3Mpa 30min no shock
Temperature Max.oC 200
Pressure Max. Mpa 1.5
Resistance to media Water, seawater, steam, fuel, gases, salt solutions
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