MQ-137 NH3 Gas Sensor Module for Ammonia, Carbon monoxide Detector Module
MQ-137 NH3 Gas Sensor Module for Ammonia, Carbon monoxide Detector Module
MQ-137 NH3 Gas Sensor Module for Ammonia & Carbon Monoxide Detection
Product Overview
The MQ-137 Gas Sensor Module is a high-sensitivity semiconductor gas sensor designed for detecting ammonia (NH3) and carbon monoxide (CO) in various applications. This reliable, cost-effective solution is ideal for environmental monitoring, industrial safety systems, and DIY electronics projects.
Key Features
High Sensitivity - Detects ammonia concentrations from 10-300 ppm
Fast Response Time - Quick gas detection and alert capability
Wide Operating Range - Temperature: -10 degreesC to 50 degreesC
Analog Output - Easy integration with microcontrollers (Arduino, Raspberry Pi)
Low Power Consumption - Ideal for battery-powered applications
Compact Design - Space-efficient module format
Technical Specifications
| Parameter | Details |
| Sensor Type | Semiconductor MQ-137 |
| Detection Gas | Ammonia (NH3), Carbon Monoxide (CO) |
| Detection Range | 10-300 ppm (Ammonia) |
| Output Type | Analog (AO pin) + Digital (DO pin) |
| Operating Voltage | 5V DC |
| Heating Time | 2 minutes (warm-up) |
| Operating Temperature | -10 degreesC to 50 degreesC |
| Storage Temperature | -20 degreesC to 70 degreesC |
| Humidity Range | 95% RH max (non-condensing) |
| Module Size | 32 x 27 x 27 mm |
| Weight | ~20 grams |
| Origin | Original/Authentic |
| Warranty | 7-day warranty on manufacturing defects |
What's Included
In the Box:
- 1x MQ-137 Gas Sensor Module (pre-assembled)
- 1x Jumper wire set (4-pin connector compatible)
- 1x Technical datasheet & pinout diagram
- 1x Quick start guide
- 1x Support documentation
Pin Configuration
| Pin | Function | Color |
| VCC | Power Supply (+5V) | Red |
| GND | Ground | Black |
| AO | Analog Output | Yellow |
| DO | Digital Output | Green |
Applications
Industrial & Commercial
- Air quality monitoring systems
- Ammonia leak detection in refrigeration plants
- Wastewater treatment facilities
- Chemical manufacturing safety
Residential & Environmental
- Home air quality monitoring
- Livestock farm ammonia detection
- Indoor environmental sensors
- Smart home automation systems
Educational & DIY
- Arduino/Raspberry Pi projects
- IoT development platforms
- Electronics learning kits
- Maker/hobbyist experiments
Research & Development
- Environmental monitoring studies
- Gas sensor calibration projects
- Prototype development
How It Works
- Detection - The semiconductor sensor detects gas molecules and changes resistance
- Signal Processing - Built-in amplifier converts resistance change to voltage
- Output - Provides both analog (0-5V) and digital (HIGH/LOW) signals
- Integration - Connect to microcontroller for real-time monitoring and alerts
Why Choose Our MQ-137?
100% Authentic - Sourced from authorized distributors with certification
Quality Assured - Tested before shipment
Expert Support - 24/7 technical assistance via WhatsApp & Email
Fast Shipping - 7-8 days across India from Bengaluru warehouse
7-day warranty on manufacturing defects - Full manufacturer coverage on defects
Trusted Supplier - The Tech Depot's 10+ years of reliability
Installation & Usage Guide
Quick Start
- Connect VCC to +5V power supply
- Connect GND to ground
- Connect AO pin to analog input (A0) on microcontroller
- Connect DO pin to digital input (D2) on microcontroller
- Allow 2-minute warm-up time before reading
- Calibrate in clean air for accurate readings
Arduino Code Example
```cpp int analogPin = A0; int digitalPin = 2; void setup() { Serial.begin(9600); pinMode(digitalPin, INPUT);delay(120000); // 2-minute warm-up
} void loop() {int analogValue = analogRead(analogPin);
int digitalValue = digitalRead(digitalPin);
Serial.print("Analog: "); Serial.print(analogValue); Serial.print(" | Digital: "); Serial.println(digitalValue); delay(1000); } ```Frequently Asked Questions
Q: What's the difference between MQ-137 and other MQ sensors?
The MQ-137 is specifically optimized for ammonia (NH3) detection with high sensitivity in the 10-300 ppm range. Other MQ sensors target different gases like methane (MQ-4), LPG (MQ-5), or alcohol (MQ-3).
Q: How long does the sensor last?
With proper use, the MQ-137 typically lasts 2-5 years. Lifespan depends on operating conditions, frequency of use, and exposure to extreme temperatures.
Q: Is calibration required?
Yes, for accurate readings, calibrate in clean air during the first use. Most applications use the sensor in relative mode (comparing readings rather than absolute values).
Q: Can I use this
Buy MQ-137 NH3 Gas Sensor Module for Ammonia, Carbon monoxide Detector Module Online in India
Purchase the MQ-137 NH3 Gas Sensor Module for Ammonia, Carbon monoxide Detector Module online at The Tech Depot - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on MQ-137 NH3 Gas Sensor Module for Ammonia, Carbon monoxide Detector Module with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.
Looking to buy MQ-137 NH3 Gas Sensor Module for Ammonia, Carbon monoxide Detector Module at the best price in India? The Tech Depot offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.