MQ136 overview
The MQ136 Hydrogen sulfide gas detection module belongs to the MQ gas sensor family infamous for its use in the early detection and warning of toxic concentrations of harmful gases in a closeby vicinity. The core sensing material of the MQ136 gas sensor is SnO2, offering a lower conductivity under nominal conditions (clean air) and a higher conductivity ratio when the target hydrogen sulfide gas (H2S) reaches a dangerous concentration in the nearby vicinity.
MQ136 H2S gas sensor is easily interfaceable with almost every MCU such as Arduino Uno, ESP32, NodeMCU, etc, allowing the obtained data to communicate over various different mediums and IoT devices.
Key specifications
Datasheet
MQ136 features
- Dual signal output (analog output and TTL level output)
- The TTL output effective signal is low.
- Analog output 0 ~ 5V voltage, the higher the concentration the higher the voltage.
- Size: 32mm X22mm X27mm (length X width X height)
- The main chip: LM393, ZYMQ-136 gas sensors
- Good sensitivity to hydrogen sulfide, liquefied gas, natural gas, city gas, and smoke.
- with long service life and reliable stability
- fast response recovery characteristics
- ESD protection
- Overvoltage protection
MQ136 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | VCC | This pin powers the module, typically the operating voltage is +5V |
| 2 | GND | Used to connect the module to the system ground |
| 3 | Digital Out (DO) | You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer |
| 4 | Analog Out (AO) | This pin outputs 0-5V analog voltage based on the intensity of the gas. |
MQ136 specifications
| Model No | MQ136 |
|---|---|
| Sensor Type | Semiconductor |
| Standard Encapsulation | Bakelite (Black Bakelite) |
| Detection Gas | Hydrogen Sulfide |
| Concentration | 1-200ppm |
| Loop Voltage Vc | ≤24V DC |
| Heater Voltage VH | 5.0V±0.2V AC or DC |
| Load Resistance | Adjustable |
| Heater Consumption | ≤900mW |
| Heater Resistance | 31Ω±3Ω (Room Temp.） |
| Sensitivity S | Rs(in air)/Rs(in 50ppm H2S)≥3 |
| Slope (α) | (R50ppm/R10ppm H2S) |
| Temp. Humidity | 20℃±2℃；65%±5%RH |
| Preheat time | Over Forty-Eight hours |
| Sensing Resistance | Rs 2KΩ-20KΩ(in 50ppm H2S) |
MQ136 applications
- Detect or measure harmful concentrations of sulfide Gases
- Air quality monitoring systems
- Hydrogen sulfide Gas leak alarm
- Industrial SO2 leakage detector
- Portable SO2 detector
- Safety standard maintenance system
More about MQ136
Datasheet
See Also: SIM900A Dual Band GSM/GPRS Module | YX5300 MP3 Music Player UART Control Serial Module | HC12 SI4463 433Mhz Wireless RF Serial Port Module
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