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Application of carbon dioxide sensor in greenhouse
The main feature of modern greenhouses is the introduction of sensor technology, electronic technology, Internet of Things technology and cloud technology on the basis of the original greenhouse environment monitoring and control system. Due to the combination of the above technologies and greenhouses, most modern greenhouse monitoring equipment can be remotely monitored through wireless communication technologies, such as cloud platforms on the PC side and APP or WeChat official account on the mobile phone. Although the monitoring terminals of the modern greenhouse environment monitoring system are diverse, they all need to monitor the four necessary factors for plant growth: temperature, water, light, and carbon dioxide. Among these four elements, the first three are relatively conventional data. Only carbon dioxide is often overlooked because it is invisible and intangible. However, carbon dioxide is one of the raw materials for photosynthesis of plants, and the level of carbon dioxide concentration directly affects crops. The quality of growth. The impact of carbon dioxide concentration on greenhouses Carbon dioxide is the raw material for photosynthesis of green crops, and 95% of the dry weight of crops comes from photosynthesis. Therefore, carbon dioxide has become an important factor affecting crop yields. Because greenhouse cultivation keeps crops in a relatively closed place for a long time, the carbon dioxide concentration in the greenhouse changes greatly within a day. If the carbon dioxide deficit in the greenhouse is serious, it will become an important factor affecting the yield of greenhouse crops. Therefore, it is necessary to install a crop greenhouse environmental indicator detector in the greenhouse to ensure that the detection of the insufficient carbon dioxide concentration in the greenhouse can promptly alarm, so as to use gas fertilizer to ensure that vegetables, edible fungi, flowers, Chinese medicine and other crops are marketed early and high. High quality and yield. Changes in the concentration of carbon dioxide The greenhouse is a relatively sealed place, and the difference in the concentration of carbon dioxide inside and outside the greenhouse is very obvious. During the daytime, the photosynthesis of green plants in the greenhouse is vigorous, and the concentration of carbon dioxide drops sharply; at night, the photosynthesis stops, the respiration of crops releases carbon dioxide, and the indoor concentration gradually increases. The carbon dioxide sensor in the greenhouse can monitor the concentration of carbon dioxide in the greenhouse in real time, which plays a very important role in the growth and development of crops. The choice of carbon dioxide sensor 1. Infrared carbon dioxide sensor: The sensor uses the principle of non-dispersive infrared (NDIR) to detect CO2 in the air, with good selectivity and no oxygen. Dependence, widely used in various occasions where flammable and explosive gases exist. 2. Catalytic carbon dioxide sensor: It converts the concentration of carbon dioxide detected on site into a standard 4-20mA current signal output, which is widely used in petroleum, chemical industry, metallurgy, refining, gas transmission and distribution, biochemical medicine And water treatment industries. 3. Thermal conductivity carbon dioxide sensor: It is made according to the principle that the total thermal conductivity of the mixed gas changes with the content of the gas to be analyzed. The detection element and the compensation element are paired to form the two arms of the bridge. When encountering flammable gas, the resistance of the detecting element becomes smaller, and when encountering non-flammable gas, the resistance of the detecting element becomes larger (air background). Reference and temperature compensation, the main application places are the concentration detection of natural gas, liquefied gas, coal gas, alkanes and other flammable gases and gasoline, alcohol, ketone, benzene and other organic solvent vapors in civil and industrial sites. The carbon dioxide sensor used in the greenhouse mainly uses the non-dispersive infrared (NDIR) principle to detect the CO2 in the air. The sensor is not affected by the external high humidity environment under the premise of good air permeability, and has resistance to Water vapor interference, no oxygen dependence, good selectivity, high measurement accuracy, long life and many other advantages. Precautions for using carbon dioxide sensors in greenhouses 1. Pay attention to the monitoring range: In general, the default measurement range of carbon dioxide sensors is 0-5000ppm, but in some greenhouses with high carbon dioxide, when crops breathe strongly At this time, the CO2 concentration may exceed 5000ppm, so the measurement range should be 0-10000ppm. 2. Pay attention to waterproof: There is a layer of breathable membrane on the CO2 sensor device, so the device is not waterproof, so pay attention to waterproof when using it. 3. Pay attention to the ambient temperature: the working environment temperature of the carbon dioxide sensor itself is -10~50℃. If the temperature exceeds this temperature, measurement errors will occur, so pay attention to the ambient temperature.
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