I. Product Overview climate control industry view is that indoor air quality is to detect temperature, humidity and carbon dioxide (CO2) content. However, for most consumers, the air quality is the volatile organic compounds (VOCs), such as smoking, cooking odors, biological waste water and outdoor pollutants. And the temperature and humidity are readily measured by the sensor may be carbon dioxide (infrared absorption) measurement, but this kind of sensor is not only costly but are also difficult to detect volatile organic compounds so far. Indoor air quality detector is a high sensitivity, high reliability, detect poor air quality solutions. The instrument uses a metal oxide semiconductor micromachining (MOS) technology to detect a wide range of volatile organic compounds, and is directly related to the carbon dioxide content in the room. YMCO2-100 type of indoor air quality testing instrument uses a MOS sensor element for the detection of reducing gases such as carbon monoxide in a wider range (CO) and volatile organic compounds (VOCs) and so on. These gases cause changes occur when the resistance of the sensor to produce an electrical signal associated with the concentration range of the specific gas, and converted to a concentration equivalent to ppm CO2 displayed on the LCD screen. When exceeding the threshold set by the meter relay control system to increase ventilation. When the volatile organic content is reduced limit, instrumented system reduces ventilation to achieve the objective of reducing building energy-saving operating costs. Air quality as close to human perception, demand controlled ventilation in any environment, air quality is very important, including the application of large commercial facilities, offices, classrooms, kitchen and bathroom and other various environments. Second, the product features a superior air quality sensor to detect carbon dioxide, 2, and 3 directly related to carbon dioxide levels, high sensitivity, fast response 4, small size, easy to install 5, carbon dioxide sensor metal oxide semiconductor automatic baseline correction 6 low power 7, temperature, humidity, time display function. Third, the test substance 1, 2 alcohols, aldehydes 3, 4 aliphatic hydrocarbons, amines 5, 6 aromatic hydrocarbon, carbon monoxide, methane, liquefied petroleum 7, oil and gas 8, 9 ketones, organic acids four, Instructions 1. MENU key: Press 3 seconds to enter setting mode; then key in order to activate the alarm low alarm high value, year, month, day, hour, minute setting state; in setting state, press 3 seconds to exit the setting ; 2. ▼ ▲ keys: did not enter the set state, ▼ ▲ key is invalid, only enter the set state, ▼ ▲ keys to denote the addition and subtraction of values. 3. Any key operation in addition to the power button will activate the backlight; 4. The default alarm time is 1200; the second alarm value of 2400; later when the VOC values ??higher than the second alarm relay opens, less than one alarm relay will be closed; 5. After the instrument is switched, VOC detector requires 15 minutes for self-calibration, numerical period has been 450; then began to detect, but to achieve the best sensitivity requires more than five hours; so do not frequently turn off the detector. Fifth, the electrical characteristics of a detection range: the equivalent of 450 ~ 2000 ppm 2, the DC power supply: 5.0 ± 0.25V, maximum 20 mV ripple 3. Power consumption: ≤0.5W 4, the first turn-on time: 15 minutes 5, the relay drive current: 1A / 120VAC 1A / 60VDC six, environmental conditions an operating temperature: 0 ℃ ~ 50 ℃ 2, Storage temperature: -25 ℃ ~ 50 ℃ 3, humidity range: 5 ~ 95% RH, non. condensing seven, mechanical dimensions 1, size (approximately): 135mm × 122mm × 30mm 2, Weight (approx): 250g 3, DC power input socket: with an outer diameter of 5.5mm 4 core 2.2mm plug, relay driver: 2.54 mm pitch Lead output connector see Figure 1 Figure 1 eight randomly Annex 1, YMCO2-100 type of indoor air quality testing instrument 1 2. Product Manual 1 3, USB cable 1 4, the relay drive output cable 1