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

1. Detection - The semiconductor sensor detects gas molecules and changes resistance
2. Signal Processing - Built-in amplifier converts resistance change to voltage
3. Output - Provides both analog (0-5V) and digital (HIGH/LOW) signals
4. 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 Engineer Store's 10+ years of reliability

Installation & Usage Guide

Quick Start

1. Connect VCC to +5V power supply
2. Connect GND to ground
3. Connect AO pin to analog input (A0) on microcontroller
4. Connect DO pin to digital input (D2) on microcontroller
5. Allow 2-minute warm-up time before reading
6. 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 Engineer Store - 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 Engineer Store 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.