The MQ-137 Ammonia Gas NH3 Sensor Module is a versatile and reliable sensor designed to detect ammonia (NH3) and carbon monoxide (CO) gases. With its fast response time of less than 1 second and high sensitivity (~3%), it is suitable for applications requiring quick and accurate gas detection. The module outputs both analog voltage (0–5V) proportional to gas concentration and a digital TTL output (0V or 5V) for threshold-based detection, adjustable using the onboard potentiometer. Designed to operate at +5V, this sensor integrates easily with microcontrollers like Arduino for building gas monitoring systems. With its stable operation, long lifespan, and compact size, the MQ-137 is widely used in air quality monitoring, gas leak alarms, hospital safety, and environmental standard maintenance. Featured By RoboticsBD.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Features:
Wide Detection Range – Detects NH3 and CO gases effectively.
Fast Response Time – Less than 1 second for quick detection.
Dual Output Modes – Analog (0–5V) and Digital TTL (0V or 5V).
Adjustable Sensitivity – Onboard potentiometer for fine-tuning.
Stable & Long Life – Designed for continuous monitoring.
Arduino Compatible – Easy integration with microcontrollers.
Low Power Operation – Runs on standard +5V supply.
Visual Indicators – Built-in power and output LEDs.
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Applications:
Air Quality Monitoring – Detect ammonia and CO levels indoors or outdoors.
Gas Leak Alarms – Trigger alerts in case of dangerous leaks.
Hospital & Lab Safety – Maintain environmental safety standards.
Industrial Monitoring – Track gas levels in factories and storage areas.
Smart IoT Systems – Integrate with Arduino for real-time gas sensing.
Safety Compliance – Use in systems for maintaining environmental standards.
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| General Specifications |
| Model | MQ-137 Ammonia Gas Sensor Module |
| Detected Gases | Ammonia (NH3), Carbon Monoxide (CO) |
| Operating Voltage | =+5V DC |
| Response Time | <1s |
| Sensitivity | ~3% |
| Output Type | Analog (0–5V), Digital TTL (0V or 5V) |
| Sensitivity Adjustment | Onboard potentiometer |
| TTL Output Valid Signal | Low level output |
| Analog Output Behavior | Higher concentration = higher voltage |
| Indicators | Power LED, Signal LED |
| Compatibility | Arduino, relay modules, MCUs |
| Stability | Long life, stable operation |
| Shipment Weight | 0.0073 kg |
| Shipment Dimensions | 4 × 2 × 2 cm |
Please allow 5% measuring deviation due to manual measurement.
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Documentation:
How to detect gases with the MQ-137 gas sensor module?
- Power the gas sensor module with 5V and you should notice the power LED on the module glow.
- When no gas is detected the output LED will remain turned off meaning the digital output pin will be 0V.
- These sensors need pre-heating time before they can actually be used.
- Introduce the sensor to the gas you want to detect and you should see the output LED go high along with the digital pin, if not use the potentiometer until the output gets high.
Package Includes:
1 x MQ-137 Ammonia Gas NH3 Sensor Module
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