The box net mosquito net is spacious and comfortable with potentially the largest enclosed volume of any net style. When hung from all four points it allows good air circulation and is therefore cool to sleep under. Mosquito box net is also possible to hang it from just two points to form a wedge shape. Because these boxnet are more time consuming to put up, they are probably better suited to longer term accommodation.
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Area measuring instrument sensor introduction
Area measuring instrument sensor introduction
The measuring sensor is one of the key parts of the area measuring instrument. Its performance is directly related to the measuring accuracy. Optical sensors can be divided into two types: First, photoelectric sensors, which have the characteristics of small size, high speed, high cost, high installation requirements, suitable for relatively clean environment, and second, light-sensitive sensors, which use fluorescent lamps as common light sources. The cost and the installation conditions and the use environment are relatively low. The interface circuit between the area measuring instrument and the measuring sensor can be selected according to the specific circumstances.
The measuring instrument is available for synchronous measurement or asynchronous measurement. The so-called synchronous measurement method (speed detection) refers to the online detection of the motor speed, according to the motor speed to calculate the linear velocity of the measured object movement. The asynchronous measurement method is based on the rated speed of the motor to calculate the linear velocity of the measured object, but the fluctuation of the grid voltage will affect the measurement accuracy. There are generally three kinds of speed detection methods: one is a pulse disc angle digital converter, which is characterized by high precision, but the pulse disc is more susceptible to wear; the second is an optoelectronic encoder/digital converter, characterized by high precision and code No wear, light source life is short; the third is the electric proximity switch, mainly used to measure the distance, characterized by simple structure, easy installation and low price, but for the speed measurement than the previous two methods are low accuracy. The first two methods are suitable for high-speed measurement. Because the speed of the measuring instrument is low, the GEN-1705 proximity switch is used.
The area meter has a variety of uses and can be used to determine farmland area or house use area. When used for land area measurement, the harvester can be used to determine the area of ​​the farmland, which is also called the harvester area measuring instrument. In many places, the unit of area is still used as a unit of measurement. At this time, we are also used to refer to the area measuring instrument as an acre. The area measuring instrument makes farm operations more efficient and convenient, and also promotes the development of agriculture to modern agriculture.