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Ammonia Gas Sensor - MQ-137
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Price: $68.62
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Sparkfun Item #: SEN-17053 -

The MQ-137 is an Ammonia (NH₃) gas sensor from Winsen. The sensing element is SnO2, which has lower conductivity in clean air. When NH₃ (Ammonia) gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. A simple circuit makes measuring this change in conductivity and turning it into data fairly straight-forward, but does require some calibration. For easy Solderability; use our Gas Sensor Breakout Board. Documents: Datasheet Videos ...

Dual Gas CO and CH4 Detection Sensor - MQ-9B
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Price: $10.56
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Sparkfun Item #: SEN-17050 -

The MQ-9B is a CO and CH₄ gas detection sensor form Winsen. The sensing material of the MQ-9B is SnO2, which has a low conductivity in clean air. It detects carbon monoxide (1.5V) by method of cycling high and low temperature. The sensor’s conductivity gets higher with the CO and CH₄ gas concentration rising. The sensing range is 10-500ppm CH₄. A simple circuit makes measuring this change in conductivity and turning it into data fairly straight-forward, but does require some calibration. For...

Hydrogen Sulfide Gas Sensor - MQ-136
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Price: $68.62
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Sparkfun Item #: SEN-17052 -

The MQ-136 is a Hydrogen Sulfide detection sensor with a sensing range of 1 - 200ppm. The sensing element is SnO2, which has lower conductivity in clean air. When H₂S gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. A simple circuit makes measuring this change in conductivity and turning it into data fairly straight-forward, but does require some calibration. For easy Solderability; use our Gas Sensor Breakout Board. Documents: Datasheet Videos ...

Low Concentration Ozone Gas Sensor - MQ-131
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Price: $68.62
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Sparkfun Item #: SEN-17051 -

The MQ-131 is a low concentration Ozone gas sensor from Winsen. The sensing material for the MQ-131 is WO₃. It will have lower conductivity in clean air and higher conductivity when the ozone concentration rises. This sensor has high sensitivity to ozone, and also has sensitivity to strong oxide such as Cl₂, NO₂ &etc. It responses oppositely to organic interference gases. The sensing range is 10 - 1000ppm. A simple circuit makes measuring this change in conductivity and turning it into data...

Smoke Sensor - MQ-2
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Price: $9.90
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Sparkfun Item #: SEN-17049 -

The MQ-2 is a smoke and combustible gas sensor from Winsen. It can detect flammable gas in a range of 300 - 10000ppm. It's most common use is domestic gas leakage alarms and detectors with a high sensitivity to propane and smoke. The sensing material is SNO₂ for which the conductivity is lower in clean environments and higher when smoke or flammable gas is present. A simple circuit makes measuring this change in conductivity and turning it into data fairly straight-forward, but does require...