MQ-137 NH3 Gas Sensor Module
The MQ137 sensor is a gas sensor module is specially designed to detect and sense gases like ammonia (NH3) and carbon monoxide (CO). The MQ137 gas sensor module comes with digital pins that can be connected to a microcontroller like Arduino boards and come in handy when you are only trying to detect one particular gas.
Applications:
- Detect or measure Gases like NH3 or CO
- Air quality monitor
- Gas leak alarm
- Safety standard maintenance
- Maintaining environmental standards in hospitals
Package Includes:
- 1 x MQ-137 NH3 Gas Sensor Module
Specifications
| Main chip | LM393 |
| Gas Sensitivity | Ammonia (NH3) and Carbon Monodioxide (CO) |
| Working voltage | DC 5V |
| concentration range | 10 to 300ppm |
| Dimensions | 32mm X22mm X30mm |
| Weight | 10 grams |
Frequently Asked Questions
1. What are gas sensors? How do they work?
- Gas sensors (also known as gas detectors) are electronic devices that detect and identify different types of gasses. They are commonly used to detect toxic or explosive gasses and measure gas concentration.
Gas sensor detects the presence or concentration of gases in the atmosphere. Based on the concentration of the gas the sensor produces a corresponding potential difference by changing the resistance of the material inside the sensor, which can be measured as output voltage. Based on this voltage value the type and concentration of the gas can be estimated.
2. How to detect gases with the MQ137 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.