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