MQ-136 Hydrogen Sulfide Gas Sensor Module GODIYMODULES DC5V TTL/Analog

Description

Product Overview

The MQ-136 is a high‑performance hydrogen sulfide (H2S) gas sensor module designed for precise detection of sulfide gases in a wide range of environments. Manufactured by GODIYMODULES, the sensor incorporates a robust tin‑oxide semiconductor element that reacts selectively to H2S molecules, producing a measurable change in resistance. Operating at a nominal 5 V DC supply, the module draws approximately 150 mA, making it suitable for both battery‑powered and mains‑connected applications. The compact dimensions of 1.18 × 0.78 × 0.75 inches and a lightweight of 0.64 oz allow easy integration into handheld devices, stationary monitoring stations, and embedded systems.

Key technical specifications include a dual‑output architecture: a TTL digital output that switches between 0 V and 5 V to indicate the presence of H2S above a configurable threshold, and an analog output that provides a continuous voltage level proportional to gas concentration. This flexibility enables developers to choose the most appropriate interface for their control logic, whether it be a microcontroller, PLC, or relay module. The sensor also features an internal heating element that stabilizes the sensing element at a constant temperature, ensuring repeatable and reliable measurements after a short warm‑up period of approximately 20 seconds.

Designed for durability, the MQ-136 module is built with a protective housing that shields the internal components from dust, moisture, and mechanical shock. The module complies with standard industrial safety guidelines and is RoHS‑compliant, reflecting a commitment to environmentally responsible manufacturing. With a price point of $21.88, it offers an affordable solution for laboratories, research facilities, and industrial plants seeking accurate H2S monitoring without compromising on quality.

Usage

The MQ-136 sensor excels in applications where hydrogen sulfide detection is critical for safety, process control, and environmental compliance. In laboratory settings, researchers use the module to monitor H2S concentrations during chemical synthesis, fermentation processes, and analytical experiments. Its rapid response time and precise analog output enable real‑time data logging and integration with scientific software for detailed analysis.

Industrial users deploy the sensor in oil and gas refineries, wastewater treatment plants, and petrochemical facilities where H2S is a common by‑product. By connecting the TTL output to alarm systems or automatic shut‑off valves, facilities can trigger immediate safety protocols when gas levels exceed predefined limits, protecting personnel and equipment. The analog output can feed into continuous monitoring dashboards, providing trend data that supports regulatory reporting and preventive maintenance strategies.

Environmental monitoring agencies employ the MQ-136 in field‑portable devices to assess air quality near volcanic vents, landfill sites, and agricultural operations. Its low power consumption and compact form factor make it ideal for battery‑operated handheld meters that can be carried by field technicians for on‑site measurements. The sensor’s ability to operate reliably across a temperature range of -20 °C to 85 °C further expands its suitability for outdoor deployments.

Educational institutions incorporate the module into electronics curricula, allowing students to experiment with gas‑sensing circuits, calibrate analog signals, and develop custom firmware for microcontroller platforms such as Arduino, ESP32, and Raspberry Pi. The straightforward wiring—simply connect VCC, GND, and the desired output pin—facilitates hands‑on learning and rapid prototyping.

Why Choose Us

Choosing the MQ-136 from GODIYMODULES means partnering with a brand that prioritizes quality, reliability, and customer support. Each sensor undergoes rigorous factory calibration using certified gas mixtures to guarantee accuracy across the full detection range. The manufacturing process incorporates high‑grade materials, including a corrosion‑resistant ceramic substrate and a precision‑engineered heating coil, ensuring long‑term stability even in harsh chemical environments.

Our commitment to after‑sales service includes a comprehensive warranty, responsive technical assistance, and access to detailed datasheets, application notes, and firmware libraries. Customers benefit from a dedicated support portal where they can download reference designs, request calibration services, or troubleshoot integration challenges with the guidance of experienced engineers.

In addition to product excellence, GODIYMODULES emphasizes sustainability. The sensor is RoHS‑compliant, free from hazardous lead, mercury, and cadmium, aligning with global environmental standards. By selecting our sensor, you contribute to a greener supply chain while receiving a component that meets the stringent performance expectations of modern industrial and scientific applications.

Key Features

• Dual‑output design offers both TTL digital and analog signals for flexible system integration.
• Fast warm‑up time of ~20 seconds ensures quick readiness for accurate measurements.
• Compact, lightweight housing enables easy installation in portable and fixed‑mount devices.
• Robust construction with protective casing resists dust, moisture, and mechanical shock.
• Comprehensive technical support and warranty provide confidence and long‑term reliability.

FAQ

What is the detection range of the MQ-136 sensor?

The MQ-136 can detect hydrogen sulfide concentrations from 5 ppm up to 1000 ppm, providing reliable response across low to high exposure levels.

How do I calibrate the sensor for accurate readings?

Calibration involves exposing the sensor to a known concentration of H2S gas, adjusting the output threshold via the onboard potentiometer, and verifying the analog voltage corresponds to the expected concentration using a multimeter or data acquisition system.

Can the sensor be used in explosive atmospheres?

While the MQ-136 is designed for industrial and laboratory use, it is not intrinsically explosion‑proof. For hazardous locations, additional protective enclosures meeting ATEX or IECEx standards should be employed.

What power supply voltage is required?

The module operates on a stable 5 V DC supply and draws approximately 150 mA during normal operation, making it compatible with most microcontroller development boards.

Is there a recommended warm‑up period before taking measurements?

Yes, after power‑on, allow the sensor about 20 seconds to reach its operating temperature. This ensures the heating element stabilizes and the output signals reflect accurate gas concentrations.