The role of carbon dioxide monitor in greenhouse control

The application of greenhouses in modern agriculture is very common. As a relatively closed environment, the concentration of carbon dioxide in greenhouses is insufficient and changes day and night, which has a great impact on plant growth and development. In order to be able to meet the growing needs of various plants, modern carbon dioxide monitoring devices for electronic devices are used to measure and control the carbon dioxide concentration, and the concentration is controlled in the best state so that the plants are always in the best growing environment and the best harvest is obtained.

Through the monitoring data of the carbon dioxide monitor, it was found that due to the photosynthesis of plants, the day-night variation of carbon dioxide concentration in greenhouses is relatively large. In the greenhouse, the highest concentration of carbon dioxide in the morning reached 1.2 mL/L; as the photosynthesis of plants increased during the day, the concentration of carbon dioxide remained relatively low. After 1600 hours, the photosynthesis of the plant weakened and the carbon dioxide concentration began to rise. At night, carbon dioxide was released under the action of plants and soil, gradually increasing the concentration of carbon dioxide to the highest point of the day. In greenhouses of other crops, there is a similar change in carbon dioxide concentration.

The carbon dioxide concentration control system is based on information such as the crop type input by the user through the panel, the crop sowing date, and the like. The SCM calculated the carbon dioxide concentration control scheme according to the crop variety, the crop growth period, the current season, the temperature in the greenhouse, and the illuminance, and added two proportional liquids through a dilute sulfuric acid feeder and an ammonium bicarbonate feeder. Chemical reaction produces carbon dioxide gas, which diffuses carbon dioxide gas into the greenhouse under the action of a blower. When the concentration of carbon dioxide reaches the specified value, the reaction is stopped, and the solenoid valve is controlled to let go of the remaining material of the reaction and prepare for the next reaction.

The success or failure of the carbon dioxide monitor control system depends to a large extent on the accuracy and completeness of the database related to crop growth and carbon dioxide concentration. China has a vast area and a wide range of climatic conditions. The same control software is not universal. Therefore, it needs a lot of applications and improvements to be more complete and practical.

Airless Spray Gun
This process occurs when paint is applied to an object through the use of an air-pressurized Spray Gun. The Sprayer Gun has a nozzle, paint basin, and air compressor. When the trigger is pressed the paint mixes with the compressed air stream and is released in a fine spray.


Types of nozzles and sprays
Due to a wide range of nozzle shapes and sizes, the consistency of the paint can be varied. The shape of the workpiece and the desired paint consistency and pattern are important factors when choosing a nozzle. The three most common nozzles are the full cone, hollow cone, and flat stream.There are two types of air-gun spraying processes. In a manual operation method the air-gun sprayer is held by a skilled operator, about 6 to 10 inches (15–25 cm) from the object, and moved back and forth over the surface, each stroke overlapping the previous to ensure a continuous coat.In an automatic process the gun head is attached to a mounting block and delivers the stream of paint from that position. The object being painted is usually placed on rollers or a turntable to ensure overall equal coverage of all sides.

Airless Spray Gun

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