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Item: 395495386049

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MQ-2B Product description: The gas sensing material used in the MQ-2B gas sensor is tin dioxide (SnO2) with lower conductivity in clean air. When there is a flammable gas in the environment where the sensor is located, the conductivity of the sensor increases as the concentration of flammable gas in the air increases. The change in conductivity can be converted to an output signal corresponding to the gas concentration using a simple circuit. The MQ-2B gas sensor is highly sensitive to propane and smoke and is ideal for the detection of natural gas and other flammable vapors. This sensor detects multiple flammable gases and is a low-cost sensor for a wide range of applications. Features: This product has good sensitivity to propane, smoke, etc. in a wide concentration range, and has the advantages of long life, low cost, and simple driving circuit. Application: Widely used in household gas leak alarms, industrial combustible gas alarms and portable gas detection instruments. Parameter: Detection gas: combustible gas, smoke Detection concentration: 300 ~ 10000ppm (combustible gas) Loop voltage Vc: ≤24V DC Heating voltage VH : 5.0V ± 0.1V AC or DC Load resistance RL: adjustable Heating resistance RH : 29 Ω ± 3 Ω (room temperature) Heating power consumption PH : ≤900mW Sensitivity S: Rs (in air) / Rs (2000ppm C3H8) ≥ 5 Output voltage Vs : 2.5V ~ 4.0V (in 2000ppmC3H8) Concentration slope α: ≤0.6 (R3000ppm/R1000ppm C3H8) Temperature, humidity: 20 °C ± 2 ° C; 55% ± 5% RH Standard test circuit: Vc: 5.0V ± 0.1V; VH: 5.0V ± 0.1V Warm-up time: no less than 48 hours Oxygen content: 21% (not less than 18%, (oxygen concentration will affect the initial value, sensitivity and repeatability of the sensor, please consult when using at low oxygen concentration) Life expectancy: 10 years Note:The figure above shows the basic test circuit for the MQ-2B sensor. The sensor requires two voltages to be applied: heater voltage (VH) and test voltage (VC). The VH is used to provide a specific operating temperature for the sensor, either DC or AC. The VRL is the voltage across the load resistor (RL) of the sensor in series. VC is the voltage for testing the load resistor RL and requires a DC power supply. MQ-4B Product description： The gas sensing material used in the MQ-4B gas sensor is tin dioxide (SnO2) with lower conductivity in clean air. When there is a flammable gas in the environment where the sensor is located, the conductivity of the sensor increases as the concentration of flammable gas in the air increases. The change in conductivity can be converted to an output signal corresponding to the gas concentration using a simple circuit. The MQ-4B gas sensor has high sensitivity to methane and strong resistance to alcohol and other interfering gases. Features: This product has good sensitivity to methane in a wide concentration range, and has the advantages of long life, low cost, and simple driving circuit. Application: Widely used in household gas leak alarms, industrial combustible gas alarms and portable gas detectors. Parameter: Detection gas: methane Detection concentration: 300 ~ 10000ppm (methane) Loop voltage Vc : ≤24V DC Heating voltage VH : 5.0V ± 0.1V AC or DC Load resistance RL: adjustable Heating resistance RH : 26 Ω ± 3 Ω (room temperature) Heating power consumption PH: ≤950mW Sensitivity S: Rs (in air) / Rs (in 5000ppm methane) ≥ 5 Output voltage Vs : 2.5V to 4.0V (in 5000ppm CH4) Concentration slope α : ≤ 0.6 (R5000ppm / R1000ppm CH4) Temperature, humidity: 20 °C ± 2 ° C; 55% ± 5% RH Standard test circuit: Vc: 5.0V ± 0.1V; VH: 5.0V ± 0.1V Warm-up time: no less than 48 hours Oxygen content: 21% (not less than 18%, (oxygen concentration will affect the initial value, sensitivity and repeatability of the sensor, please consult when using at low oxygen concentration) Life expectancy: 10 years Note: The figure above shows the basic test circuit for the MQ-4B sensor. The sensor requires two voltages to be applied: heater voltage (VH) and test voltage (VC). The VH is used to provide a specific operating temperature for the sensor, either DC or AC. The VRL is the voltage across the load resistor (RL) of the sensor in series. VC is the voltage for testing the load resistor RL and requires a DC power supply. MQ-5B Product description: The gas sensing material used in the MQ-5B gas sensor is tin dioxide (SnO2) with lower conductivity in clean air. When there is a flammable gas in the environment where the sensor is located, the conductivity of the sensor increases as the concentration of flammable gas in the air increases. The change in conductivity can be converted to an output signal corresponding to the gas concentration using a simple circuit. The MQ-5B gas sensor has high sensitivity to butane, propane and methane. It is a good combination of methane and propane. This sensor can detect a variety of flammable gases, especially liquefied gas (propane). Low cost sensor for application. Features: This product has good sensitivity to flammable gases (especially propane) in a wide concentration range, and has the advantages of long life, low cost, and simple driving circuit. Application: Widely used in household gas leak alarms, industrial combustible gas alarms and portable gas detection. Parameter: Detection gas: liquefied gas, methane Detection concentration: 300 ~ 10000ppm (methane, propane) Loop voltage Vc: ≤24V DC Heating voltage VH : 5.0V ± 0.1V AC or DC Load resistance RL: adjustable Heating resistance RH : 29 Ω ± 3 Ω (room temperature) Heating power consumption PH : ≤ 950mW Sensitivity S : Rs (in air) / Rs (in 2000ppm C3H8) ≥ 5 Output voltage Vs : 2.5V ~ 4.0V (in 2000ppm C3H8) Concentration slope α : ≤ 0.6 (R3000ppm/R1000ppm C3H8) Temperature, humidity: 20 °C ± 2 °C; 55% ± 5% RH Standard test circuit: Vc: 5.0V ± 0.1V; VH: 5.0V ± 0.1V Warm-up time: no less than 48 hours Oxygen content: 21% (not less than 18%, (oxygen concentration will affect the initial value, sensitivity and repeatability of the sensor, please consult when using at low oxygen concentration) Life expectancy: 10 years Note: The figure above shows the basic test circuit for the MQ-5B sensor. The sensor requires two voltages to be applied: heater voltage (VH) and test voltage (VC). The VH is used to provide a specific operating temperature for the sensor, either DC or AC. The VRL is the voltage across the load resistor (RL) of the sensor in series. VC is the voltage for testing the load resistor RL and requires a DC power supply. MQ-9B Product description: The gas sensing material used in the MQ-9B gas sensor is tin dioxide (SnO2) with lower conductivity in clean air. The low-temperature (1.5V heating) is used to detect carbon monoxide by high-temperature cycle detection method. The conductivity of the sensor increases with the increase of the concentration of carbon monoxide gas in the air, and the high-temperature (5.0V heating) cleans the gas adsorbed at low temperature. The change in conductivity can be converted to an output signal corresponding to the gas concentration using a simple circuit. Features: This product has good sensitivity to carbon monoxide in a wide concentration range, and has the advantages of long life, low cost, and simple driving circuit. Application: It is widely used in household carbon monoxide gas leak alarms, industrial carbon monoxide gas alarms and portable carbon monoxide gas detectors. Parameter: Detection gas: carbon monoxide, methane Detection concentration: 10～500ppm CO, 300～10000ppm CH4 Loop voltage: Vc ≤10V DC Heating voltage VH: 5.0V ± 0.1V AC or DC (high temperature); 1.5V ± 0.1V AC or DC (low temperature) Heating time T : 60 S ± 1S (high temperature), 90 S ± 1S (low temperature) Load resistance RL: adjustable Heating resistance RH : 29 Ω ± 3 Ω (room temperature) Heating power consumption PH: ≤900mW Sensitivity S: Rs (in air) / Rs (in 150ppm CO) ≥ 5; Rs (in air) / Rs (in 5000ppm CH4) ≥ 3 Output voltage Vs: 2.5V to 4.3V (in 150ppm CO); 2.0V to 4.0V (in 5000ppm CH4) Concentration slope α : ≤ 0.6 (R300ppm / R50ppm CO) ≤ 0.6 (R5000ppm/R1000ppm CH4) Temperature, humidity: 20 °C ± 2 ° C; 55% ± 5% RH Standard test circuit Vc: 5.0V ± 0.1V; VH (high temperature): 5.0V ± 0.1V; VH (low temperature): 1.5V ± 0.1V Warm-up time: no less than 48 hours Oxygen content: 21% (not less than 18%, (oxygen concentration will affect the initial value, sensitivity and repeatability of the sensor, please consult when using at low oxygen concentration) Life expectancy: 10 years Note: The figure above shows the basic test circuit for the MQ-9B sensor. The sensor requires two voltages to be applied: heater voltage (VH) and test voltage (VC). VH is used to provide the sensor with a specific operating temperature. It can be used with DC power or AC power. This model requires VH to be in the low voltage state of 1.5V±0.1V when the sensor detects carbon monoxide, and in the non-detection state (recovery phase). It is in the state of 5V ± 0.1V. The VRL is the voltage across the load resistor (RL) of the sensor in series. VC is the voltage for testing the load resistor RL and requires a DC power supply.

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