CO2 Temperature Humidity Meter Infrared CO2 Sensor for Home School

Product DescriptionAGn31 is a 4 in 1 CO2 monitor with Dual Beam NDIR technology and large LCD, which clearly displays the CO2, temp, RH and real-time clock. To save power and extend battery life, the AK -n31 darkens the LCD backlight automatically from 22:00pm to 6:00 am. It is ideal for monitor air quality inside buildings like residential, library, offices, schools, shopping mall and HVAC systems.Basic Info.Model NO.AGn31RTC functionKeep run 7days after power offTrademarkOEM/ODMPower SourceUSB Type-CSensor TypeDual-Beam NDIROriginChina KunShanCO2 Range0~5000ppmHS Code9027100090Temperature Range0~50ºC(32°F to 122°F)Production Capacity80000 Pieces/YearRH Range0-100%Transport PackageCartonBatteryExternalPackage Type1 pcs/Color BoxSingle Package Size120*61.5*29mm  (4.7*2.4*1.1inch)Weight103g ( 3.6oz)  Device onlyFeature:Ø  Dual Beam NDIR (Non-Dispersive-Infrared) technology is used to improve the long term stability.Ø  "CHART" with 2 Alarm indicate the status of CO2 records up to 24 hours.Ø  The Large LCD clearly displays the CO2, temperature, relative humidity and real-time clockØ  "ECO" saving power function darken the LCD backlight (22:00pm to 6:00am).Ø  3-color backlight (green / yellow / red) gradually changes color with CO2 concentration.Ø  7-day RTC hold on when power off.Ø  7-color backlight for options: white - turquoise - blue - purple - green - yellow - red. Operating InstructionsLCD Display: History Chart:"CHART" with 2 Alarm indicate the status of CO2 records up to 24 hours, every three hours, the detector calculates a set of log data. The chart is used to display the history of CO2 concentration.as shown below:4 Work mode:"Auto" auto backlight is the default mode. Press "Up key" to quickly and easily change the current backlight mode, Auto AL On OFF. After selecting the mode, it is the confirmation mode. You do not need to press any key to confirm it.Back Light:The AGn31 has 7 colors of background lights. Users can set the color of the background light according to their own preferences. At the same time, the backlight of AGn31 has 4 working mode, Auto-Alarm-On-OFF. When set to auto working mode, AGN31 will automatically change the backlight color according to the CO2 concentration.Back Light ModeBacklightBuzzerAutoThe LCD screen backlight color changes with carbon dioxide concentration. 1200ppm: red. The red threshold can be modified in ALBuzzer beeps every second when AL is exceeded. Until it is turned off (with mute key) Default is OFFALThere is no backlight in normal state, but when the carbon dioxide concentration exceeds the alarm value, the LCD screen backlight is red. The AL alarm value is preset to 1,000ppm, please adjust the alarm value according to the alarm value setting method.Buzzer beeps every second when AL is exceeded. Until it is turned off (with mute key) Default is OFFONThe backlight is always on. Only backlight function, without any prompt function. Backlight color depends on selected color, see COLOR setting function.Buzzer beeps every second when AL is exceeded. Until it is turned off (with mute key) Default is OFFOFFThe backlight OFF, no back light function.Buzzer beeps every second when AL is exceeded. Until it is turned off (with mute key) Default is OFF  SpecificationsTypical test conditions, unless otherwise specified:  Ambient Temp =23+/-3°C, RH=50%-70%, Altitude=0~100 meterMeasurementSpecificationOperating Temperature32°F to 122°F (0°C to 50°C)Storage Temperature-4°F to 140°F (-20°C to 60°C)Operating & Storage RH0-95%, non-condensingCO2 Measurement Accuracy  at 0~3000ppm±50ppm or ±5% of reading, whichever is greater Accuracy  over 3000ppm±7% Repeatability20ppm at 400ppm (standard dev. of 10 readings in 1 minute)Measurement Range0-5000ppmDisplay Resolution1ppm (0-1000); 5ppm (1000-2000); 10ppm (>2000)Temp Dependence±0.2% of reading per °C or ±2ppm per °C, whichever is greater, referenced to 25°C  Pressure Dependence0.13% of reading per mmHg (corrected by user's altitude input)Response Time