SparkFun
Ammonia Gas Sensor - MQ-137
The MQ-137 is an ammonia (NH3) gas sensor from Winsen, designed to detect ammonia concentrations in the air. The sensing element is tin dioxide (SnO2), which...
The MQ-137 is an ammonia (NH3) gas sensor from Winsen, designed to detect ammonia concentrations in the air. The sensing element is tin dioxide (SnO2), which has lower conductivity in clean air and increases in conductivity as ammonia gas concentration rises.
A simple voltage divider circuit can convert the sensor's change in conductivity into a measurable analog signal, though calibration is required for accurate readings. A gas sensor breakout board is recommended for easy soldering and connection.
Key Features
- Ammonia Detection – Specifically designed for NH3 gas sensing
- SnO2 Sensing Element – Conductivity increases proportionally with ammonia concentration
- Analog Output – Simple circuit converts conductivity change into a measurable signal
- Manufacturer – Winsen
Specifications
- Target Gas – Ammonia (NH3)
- Sensing Material – Tin dioxide (SnO2)
- Output – Analog (resistance change)
Ideal For
- Ammonia leak detection
- Air quality monitoring
- Agricultural and industrial gas sensing
- Environmental monitoring projects
Package Contents
- 1× MQ-137 Ammonia Gas Sensor
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
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MQ-137 Datasheet
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Supplier page — sparkfun.com
Supplier Description · 453.0 KB · Click any page to view full size
Related Tutorials
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