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. 2018 May 6;18(5):1446. doi: 10.3390/s18051446

Table 1.

Sensor specifications.

Sensor Sensor Model Detecting Materials 1 Range
CH4 MQ-4 CH4, LPG, H2, CO, Alcohol, smoke 300–10,000 ppm CH4
CO MQ-7 CO, H2, LPG, CH4, Alcohol 10–500 ppm CO
Temperature and Humidity DHT11 Temperature, Humidity 20–90% RH
0–50 °C

1 In order of decreasing sensitivity.