1. Introduction Air quality prediction beyond CO2 The climate control industry views indoor air quality as a measure of temperature, humidity and carbon dioxide (CO 2) levels. Most consumers, however, evaluate air quality by the amount of volatile organic compounds (VOCs), such as smoke, cooking odors, bio-effluence and outdoor pollutants. While temperature and humidity are easy to measure, sensors for measuring CO2 (IR absorption) can be expensive and VOCs difficult to detect – until now. Superior detection with MOS technology The device is a sensitive, low-cost solution for detecting poor air quality. This detector uses micro-machined metal oxide semiconductor (MOS) technology to detect a broad range of VOCs while correlating directly with CO2 levels in the room. Energy savings The device is equipped with a MOS sensor element for the detection of a broad range of reducing gases such as CO and VOCs. A change of resistance in the presence of these gases generates a signal that is linked to specific gas concentration ranges and is translated into parts per million (ppm) VOC + CO2 equivalent units. When defined threshold limits are exceeded, the module alerts the climate control system to increase ventilation. When VOC levels are minimized, the module instructs the system to decrease ventilation, thereby saving energy and lowering building operating costs. Air quality as close to human perception as possible In any demand-controlled ventilation environment where air quality is important, including large commercial facilities, offices, classrooms, kitchens and bathrooms, the device performs accurately and reliably. Plus, the device’s small size and low power consumption facilitate installation in a variety of applications. Features • Superior to common Co2 detector for indoor air quality • Direct, reliable correlation to CO2 levels • Large LCD screen with CO2+Voc ,temperature ,humidity, date and time display • High sensitivity and fast response • Low power consumption • Automatic baseline correction of MEMS type CO2 sensor • Small size for convenient installation 3.Substances Detected Alcohols Aldehydes Aliphatic hydrocarbons Amines Aromatic hydrocarbons CO, CH4, LPG Ketones Organic acids 4.Features Measuring range 450-2000 ppm CO2 equivalents Power supply :DC 5.0 ± 0.25V, max. 20 mV ripple Power consumption : ≤0.5W First functional reading after startup : 15 minutes Relay drive current :1A/120VAC , 1A/60VDC Temperature range: Operation 0 to 50°C Storage -25 to 50°C Humidity range : 5 to 95% RH., non-condensing Dimensions (approximate) : 135mm×122mm×30mm Weight (approximate) : 250 grams DC power input socket: using a plug with OD5.5mm and 2.2mm core Connector : 2.54 mm pitch(See Figure 1 Connector Pin Out)
1. Introduction Air quality prediction beyond CO2 The climate control industry views indoor air quality as a measure of temperature, humidity and carbon dioxide (CO 2) levels. Most consumers, however, evaluate air quality by the amount of volatile organic compounds (VOCs), such as smoke, cooking odors, bio-effluence and outdoor pollutants. While temperature and humidity are easy to measure, sensors for measuring CO2 (IR absorption) can be expensive and VOCs difficult to detect – until now. Superior detection with MOS technology
