Applications of MQ137 Gas Sensor
Detector measure Gases like NH3 or CO
Air quality monitor
Gas leak alarm
Safety standard maintenance
Maintaining environmental standards in hospitals
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.
Features
Wide detecting scope
Fast response (less than 1s)
High sensitivity( 3%)
the circuit voltage: DC5V
Stable and long life
Can be used as a digital or analog sensor
The sensitivity of digital output can be adjusted using an onboard potentiometer
The TTL output valid signal is low. (When the output is low, the signal light is on, it can be directly connected to the MCU or relay module)
The voltage of the analog output, the higher the concentration, the higher the voltage.
Arduino compatible
Specification
| Operating Voltage (VDC) | 5 |
| Detect/Measure | NH3, Ammonia |
| Concentration | 5-500ppm (Ammonia) |
| Heater Resistance(RH) | 31Ω±3Ω Room Temp. |
| Heater consumption(PH) | ≤900mW |
| Sensing Resistance(Rs) | 2KΩ-15KΩ(in 50ppm NH3) |
| Sensitivity(S) | Rs(in air)/Rs(5000ppm CH4)≥5 |
| Slope(α) | ≤0.6(R100ppm/R50ppm NH3) |
| Output Voltage(V) | 0 ~ 5 |
| Length (mm) | 35 |
| Width (mm) | 20 |
| Height (mm) | 28 |
| Weight (gm) | 10 |
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