MQ-137 NH3 Gas Sensor Module (Ammonia Gas Detection Sensor)

The MQ-137 NH3 Gas Sensor Module is a semiconductor-based gas detection module designed to detect ammonia (NH3) gas in the air. It provides analog and digital output signals, allowing it to be connected directly to microcontrollers and monitoring systems. An onboard comparator with adjustable sensitivity provides a convenient digital alarm output when the detected gas level crosses the configured threshold.

Key Features -

• Sensitive to ammonia (NH3) gas

• Semiconductor-based gas sensing element

• Provides both analog and digital outputs

• Onboard comparator circuit

• Adjustable sensitivity using onboard potentiometer

• Fast response and recovery characteristics

• Easy interface with Arduino, ESP32, STM32 and other microcontrollers

• Suitable for gas monitoring and detection applications

• Integrated heater for sensor operation

Specifications -

• Sensor Type: Semiconductor Gas Sensor

• Target Gas: Ammonia (NH3)

• Operating Voltage: 5V DC

• Output Type: Analog and Digital

• Analog Output: Variable signal according to detected gas concentration

• Digital Output: Comparator-based threshold output

• Sensitivity Adjustment: Onboard potentiometer

• Preheat: Required for stable sensor operation

• Working Current: Moderate due to internal heater

• Detection: Suitable for NH3 concentration detection

• Operating Temperature: Standard environmental conditions

Applications -

• Ammonia gas detection

• Industrial gas monitoring

• Environmental monitoring

• Laboratory gas detection

• Gas leakage alarm systems

• Air quality monitoring

• Arduino gas sensor projects

• ESP32 and STM32 gas monitoring projects

• DIY safety and automation systems