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This is a simple-to-use Carbon Monoxide (CO) sensor, suitable for sensing CO concentrations in the air. The MQ-7 can detect CO-gas concentrations anywhere from 20 to 2000ppm.
This sensor has a high sensitivity and fast response time. The sensor’s output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.
Mainly used for CO collection detection in family, factory, underground operation. Specifications: Heater voltage: 50.2V(ACDC) Working voltage: 140mA Loop voltage: 0V(Maximum DC 15V) Loading resistance: 10K (adjustable) Detecting concentration range: 10-1000ppm Voltage in cleaning air: 1.5V Sensitivity: 3% Response time: 1S (preheating 3-5 minutes) Reply time: 30S Component power consumption: 0.7W Working temperature: -10~50 degree (nominal temperature: 20 degree) Working humidity: 95%RH (nominal humidity: 65%RH)