CO sensing unit
*Domestic gas leakage detector
* Industrial gas detector
* portable gas detector
CO sensing unit
Sensitive material of MQ-7 gas sensor is SnO2, which with lower conductivity in clean air. It make
detection by method of cycle high and low temperature, and detect CO when low temperature
(heated by 1.5V). The sensor’s conductivity is more higher along with the gas concentration
rising. When high temperature (heated by 5.0V), it cleans the other gases adsorbed under low
temperature. Please use simple electrocircuit, Convert change of conductivity to correspond output
signal of gas concentration.MQ-7 gas sensor has high sensitity to Carbon Monoxide. The sensor
could be used to detect different gases contains CO, it is with low cost and suitable for different
application.
Character
*Good sensitivity to Combustible gas in wide range
* High sensitivity to Natural gas
* Long life and low cost
* Simple drive circuit
Application
* Domestic gas leakage detector
* Industrial CO detector
* Portable gas detector
Technical Data
Model No. | MQ-7 | ||
Sensor Type | Semiconductor | ||
Standard Encapsulation | Plastic | ||
Detection Gas | Carbon Monoxide | ||
Concentration | 10-10000ppm CO | ||
Circuit | Loop Voltage | Vc | ≤10V DC |
Heater Voltage | VH | 5.0V±0.2V ACorDC(High) 1.5V±0.1V ACorDC(Low) | |
Heater Time | TL | 60±1S(High)90±1S(Low) | |
Load Resistance | RL | Adjustable | |
Character | Heater Resistance | RH | 31Ω±3Ω(Room Tem.) |
Heater consumption | PH | ≤350mW | |
Sensing Resistance | Rs | 2KΩ-20KΩ(in 100ppm CO ) | |
Sensitivity | S | Rs(in air)/Rs(100ppm CO)≥5 | |
Slope | α | ≤0.6(R300ppm/R100ppm CO) | |
Condition | Tem. Humidity | 20°C±2°C; 65%±5%RH | |
Standard test circuit | Vc:5.0V±0.1V; VH(High): 5.0V±0.1V; VH(Low): 1.5V±0.1V | ||
Preheat time | Over 48 hours | ||
