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MQ136 Hydrogen Sulfide Gas Sensor Module — H2S Detection
Regular price
Rs.5,000.00
Sale price:
Rs.5,000.00
Regular price:
Rs.6,000.00
Sale:
-17%
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MQ136 Hydrogen Sulfide Gas Sensor Module — H2S Detection
The MQ136 is a semiconductor gas sensor designed to detect hydrogen sulfide (H2S) — a toxic, flammable gas with a characteristic rotten egg smell. It uses a SnO2 sensing element that changes resistance in the presence of H2S. With analog and digital outputs, it's ideal for safety monitoring in sewage treatment plants, industrial facilities, and laboratory environments using Arduino or ESP32.
Technical Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 5V DC |
| Heater Voltage | 5V ±0.1V |
| Output Type | Analog (AO) + Digital (DO) |
| Target Gas | Hydrogen Sulfide (H2S) |
| Detection Range | 1 ppm – 200 ppm |
| Preheat Time | ~20 seconds (minimum) |
| Operating Temperature | -20°C to +70°C |
| Operating Humidity | Less than 95% RH |
Pinout
| Pin | Name | Description |
|---|---|---|
| VCC | Power | 5V Supply |
| GND | Ground | Ground |
| DO | Digital Output | HIGH when gas exceeds threshold (adjustable) |
| AO | Analog Output | Voltage proportional to H2S concentration |
Key Features
- Selective detection of hydrogen sulfide (H2S) gas
- Dual output: analog for concentration measurement, digital for threshold alarm
- Adjustable sensitivity via onboard potentiometer
- Fast response and recovery time
- Compatible with Arduino, ESP32, STM32, PIC
Applications
- Sewage and wastewater treatment plant safety
- Industrial H2S leak detection and alarms
- Mining and confined space safety monitoring
- Laboratory gas detection systems
- Agricultural biogas monitoring