FeatureApplications * long life * air purifier * high sensitivity* air quality monitoring * automatic calibration * air ventilation system * comes with temperature & humidity compensation * low cost Spec * module model:Aqm-300c * sensor:Aqs501 air quality monitoring sensor * gas detection: ammonia, hydrogen, alcohol, carbon monoxide, methane, propane, gan alkyl, styrene, propylene glycol, phenol, toluene, ethylbenzene, xylene, formaldehyde and other volatile organic gas, such as cigarettes, wood , paper burning smoke. * physical interface:Xh2.54-4 vertical outlet * output data:Ttl level¡§built-in 200ohm current limiting resistance * input voltage:5.0¡¡.2vdc ¡§without voltage reverse polarity protection * operating current:80ma * warm-up time:2 minutes * response time:10 seconds * recovery time:20 seconds * operating temperature:-10 --- 40 * operating humidity:95µ¶h * storage temperature:-20 --- 60 * storage humidity:60µ¶h * dimension:242015¡§l‡óh * weight :About 20g * sensitivity :1ppm hydrogen * sensitivity reduction:¡¡.2%/year * life:10 years Interface definition 1Power supply negative 2Power supply positive 3Output signal a 4Output signal b Output signal definition ABPollution degree LowLow0 LowHigh1 HighLow2 HighHigh3 Remarks¬hèùåê higher the pollution degree no., the worse the air quality.