Carbon dioxide concentration detection has been paid more and more attention in the aspects of living environment, plant cultivation, cultural relics and archives protection. Today, let the technical engineers of Gongminwang.com introduce what carbon dioxide sensors can be selected for these applications?
1. The application of carbon dioxide sensor in building control
The CO2 level in a building has an important impact on the health of people living and working in it. This fact has been recognized and valued by more and more people. Because even a small amount of carbon dioxide level (for example, more than 1200PPM indoors) will cause people to yawn and doze.
For this reason, it is also necessary to monitor the air quality in buildings and enclosed spaces. Use a carbon dioxide sensor to monitor the CO2 concentration in work and residential situations, which can be used as an integral part of the HVAC or air quality monitoring system. The advantage of the British GSS CO2 sensor is that the sensor is low-power enough to work on battery power without worrying about wire routing Problem, the system can be quickly installed in any required area. The system can even be a portable, handheld or wearable instrument, because the COZIR-LP is a miniature sensor suitable for very compact product definitions.
COZIR-LP
Of course, there are also some public places, such as underground parking lots, cinema stations, etc. The space is large and the power supply is convenient. At this time, a carbon dioxide sensor with good long-term stability is a must. ZyAura's carbon dioxide sensor ZG09 adopts dual-channel NDIR, which has good long-term stability. The annual drift is expected to be 20PPM, without calibration, and is cost-effective. Suitable for applications with strict price requirements.
ZG09
Second, the application of carbon dioxide sensors in smart agricultural greenhouses
Increasing carbon dioxide concentration can not only significantly improve the photosynthesis efficiency of plants, but also promote the photosynthesis of plants by expanding the range of light source utilization. The concentration of carbon dioxide in the air is relatively stable and does not change much, generally 0.03%-0.04%. When the concentration is below 25℃, as the temperature increases, photosynthesis will increase, and the creation of organic matter will increase, and the crops will be vigorous. When the temperature exceeds 30℃, the organic matter created by photosynthesis is the same as the organic matter consumed by crop respiration, or even less than the organic matter consumed by respiration, and the crop stops growing.
In order to keep warm in the production of greenhouse vegetables in winter, the greenhouse is often kept in a closed state, which causes the air in the greenhouse to be relatively blocked from the outside air. However, the airtightness of the film is strong, so after the shed is covered, the evaporation of soil moisture and crop transpiration in the shed will cause the high temperature of the air in the shed. If there is no ventilation, the relative humidity in the shed will be high. When the shed temperature increases, the relative humidity decreases, and the shed temperature decreases and the relative humidity increases. On sunny and windy days, the relative temperature is low, and on cloudy and rainy (foggy) days, the relative temperature increases. In the absence of ventilation, the relative humidity in the shed can reach 60-80% during the day, and is often around 90% at night, up to 100%. The moist air in the shed condenses into a water film or water droplets adhere to the inner surface of the film or plants when it is cold.
SH-300-DS
However, in a high humidity environment, the well-known infrared CO2 sensors on the market currently have little difference in performance. The operating humidity range of ordinary infrared principle sensors is generally below 95%RH. When the humidity value exceeds this value, ordinary sensors Soon the output becomes 0 or the output is full scale. And South Korea SOHA's anti-high humidity carbon dioxide sensor SH-300-DS can work in an environment of 0-99.5%RH, and then by adding a protective cover to the sensor, it can provide the sensor's anti-condensation ability. In the example shown in the figure below, a casing is added to the periphery of the circuit, and a special material filter cover + built-in small fan is added to prevent condensation in the internal circuit. It can ensure that the sensor works normally without being affected by condensation.
3. The application of carbon dioxide sensor in the protection of cultural relics and archives
The importance of preservation of cultural relics and archives does not need to be repeated. Real-time monitoring of abnormal conditions can be realized by real-time monitoring of the preservation environment of cultural relics and warehouse archives in museum exhibition halls, and relevant personnel (Equipment Department, Exhibition Department, Storage Department, Science and Technology Department) are reminded as soon as possible. ), take necessary protection and adjustment measures to effectively improve the efficiency of cultural relic protection. Specific work includes configuring wireless sensor monitoring networks and a variety of offline monitoring equipment to establish a cultural relics protection environment monitoring and evaluation system for the museum; making necessary glass, lighting, structure, and air-tightness modifications to the showcase, and configuring the micro-environment control, purification, and humidity control device for the showcase In order to comprehensively improve the preventive protection and display of cultural relics; carry out constant temperature and humidity transformation of the small environment of the warehouse, install constant temperature and humidity storage cabinets, constant humidity storage cabinets, fixed and mobile cabinet racks and other cultural relics protection special storage facilities, configuration No acid capsules and so on.
A high-quality carbon dioxide sensor with low power consumption and long-term stability is a must. British GSS's ultra-low power CO2 sensor COZIR-A, 0-5000PPM, accuracy is 3%, resolution 1PPM, 2 readings per second, The power consumption is 3.5mW, and it has passed the test of the Metrology Institute.
COZIR-A
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