Features Features: - For home or factory gas leakage monitoring devices, suitable for carbon monoxide and other combustible gases and monitoring devices - High-quality, dual-panel design, with power indicator and TTL signal output instructions; - DO switching signal(TTL) output and AO analog signal output - TTL output valid signal is low. (When the output low signal light is on, it can be directly connected microcontroller or relay module) - Analog output voltage:the higher the concentration,the higher the voltage - Have better sensitivity to carbon monoxide detector - Four screw holes,easy positioning - Product Dimensions: 32 (L) * 20 (W) * 22 (H) - Long life and stability - Quick response and resume - Electrical performance: - Input voltage: DC5V - Power (current): 150mA - DO output: TTL digital 0 and 1 (0.1 and 5V) - AO Output: 0.1-0.3V (relatively clean), the highest concentration voltage is about 4V - Special note: When the sensor is powered, it needs to be warmed up about 20S, so the measured data becomes stable, the heat sensor is a normal phenomenon, because its inside is with an electric wire, if not, unnomal. Specifications - Product Model:MQ-9 - Product Type:Semiconduct-gassensitive element - Gas Detected:Carbon monoxide,Combustible gas - Detectable Concentration:10-1000ppmCO, 100-10000PPM gas Package Included: 1PCS * MQ - 9 Carbon Monoxide CO Alarm Combustible Gas Sensor Module Good Quality Similar Products DC 12V Useful IR Pyroelectric Infrared PIR Motion Sensor Detector Module 5A $2.95 Time left:27d 8h 12m 10 x Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor for Arduino $12.58 Time left:3d 3h 13m Breakout BME280 Digital Humidity Temperature Barometric Pressure Sensor Module $6.96 Time left:13d 17h 8m 5Pcs Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor for Arduino $6.14 Time left:3d 3h 10m 10Pcs IR Infrared Obstacle Avoidance Sensor Module for Arduino Smart Car Robot $8.65 Time left:8d 5h 12m 12V PIR IR Pyroelectric Infrared Module Adjustable Relay Output Sensor CZ $3.39 Time left:17d 8h 28m DSM501A Dust Sensor Allergic Smoke Particles Sensor Module for 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US-100 Ultrasonic Sensor Module with Temperature Compensation for Arduino $19.41 Time left:25d 7h 49m Shipping & Handling Shipping Time: The items you ordered will be shipped out in 1-2 business day by Hong Kong Post Air Mail when your payment is clear. 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