1. Performance

 Scope of application: MQ-K1 gas sensors apply to the home device monitoring harmful gas, such as automatic exhaust device, air cleaner, kitchen ventilator and so on. It’s sensitive to reducing gas such as ammonia(NH4), hydrogen(H2), alcohol(C2H6O), carbon monoxide(CO), methane(CH4), propane(C3H8), glycerol, styrene(C8H8), propanediol(C3H8O2), hydroxybenzene, methylbenzene(C7H8), ethylbenzene(C8H10), dimethylbenzene(C8H10), formaldehyde(CH2O) and any other organic volatile gas, smog and soot.

2. Appearance and dimension

3. Technical specifications

4.Test Circuit

5.Characteristic curve of the sensor

1. MQ-K1 type curves for different gas concentrations

2. MQ-K1 type methane gas concentration change curve

3. MQ-K1 temperature and humidity change curve

4. Static voltage long-term stability test curve

5. Sensor response recovery curve

6.Precautions for use:

1. As shown in the figure below, the sensor 2 and 5 are heating electrodes, and 1 and 3 or 4 and 6 are measuring electrodes. If the voltage is applied to 1 and 3 or 4 and 6, the measuring electrodes will burn out. If the voltage is applied to 2 and 4, no signal will be obtained.

2. Do not apply high voltage, which will cause sensor damage or performance changes.

3. Avoid long-term exposure to volatile silicon compound vapor, such as hair spray, silicone adhesive, putty, which will cover and wrap sensitive materials and make the product invalid.

4. Do not allow the sensor to contact water or liquid, which will cause sensitive materials to fall off, resulting in sensor performance changes or failure.

5. Avoid using in highly corrosive environments, such as environments containing hydrochloric acid, nitric acid, strong alkaline substances or alkali metal salts, which will cause sensitive materials to deteriorate, electrodes to corrode, and sensors to be damaged.

6. Avoid using in extreme environments, such as long-term use in high-concentration gas, high humidity, high temperature, and high-pollution environments, which will cause changes in sensor performance.

7. Avoid strong vibration and impact, such as vibration during transportation and falling from a high place, which will cause the sensor electrode to break or be damaged.

8. When welding, try to use manual welding, welding temperature ≤ 250 degrees, welding time less than 3 seconds, equipment welding, such as wave soldering, use flux with less chlorine content, speed 1-2 meters/minute, temperature 250±10 degrees, one-time welding, if conditions permit, apply film treatment to the sensor mesh cap to avoid strong odor changing the sensor performance.

9. Product storage period and power-on stability time: