NDIR Methane CH4 Gas Sensor 0-100%LEL with UART Output
MNS-QT331 is a compact NDIR methane (CH4) gas sensor for reliable gas detection and monitoring. It supports 0-100%LEL, 0-5%Vol and 0-100%Vol ranges with UART and 0.4-2V outputs. Featuring temperature compensation, fast response, IP65 protection and a service life of over 5 years.
This CH4 gas sensor uses infrared absorption technology for methane concentration measurement. It supports multiple measurement ranges and provides UART and analog voltage output for system integration. The sensor features temperature compensation, stable performance, fast response and long service life, making it suitable for methane detection and monitoring equipment.
Key Features
Excellent stability,resistance to water vapor interference
Non-poisoning,high sensitivity,high resolution
Low power consumption,and fast response time
Temperature compensation
Technical Specifications
Parameter
Specification
Product Model
MNS-QT331
Target Gas
Methane / CH4
Detection Principle
NDIR Infrared
Operating Voltage
3.3-5VDC
Measurement Range
0-100%LEL / 0-5%Vol / 0-100%Vol
Accuracy
±5%FS
Temperature Compensation
Yes
Average Current
<85mA
Interface Level
DC 3.0V
Output Signal
UART / 0.4-2V
Warm-up Time
180 seconds
Response Time
T90 <30 seconds
Operating Temperature
-40°C to +70°C
Operating Humidity
0-95%RH, non-condensing
Service Life
>5 years
Protection Level
IP65
Weight
25g
Pin Definition
Pin
Description
Pin 1
GND
Pin 2
Vin Voltage Input
Pin 3
UART RXD Data Input, 0-3.0V
Pin 4
Vout, 0.4-2V
Pin 5
UART TXD Data Output, 0-3.0V
The dual-output design allows OEM manufacturers to integrate the sensor into embedded controllers, gas detectors and intelligent monitoring equipment.
Dimension
Typical Applications
Methane gas detectors
Combustible gas monitoring equipment
Fixed gas detection systems
Portable gas detection instruments
OEM methane sensing equipment
FAQ
What gas does the MNS-QT331 detect?
The MNS-QT331 is designed primarily for methane (CH4) detection using NDIR infrared absorption technology.
What methane measurement ranges are available?
Available configurations include 0-100%LEL, 0-5%Vol and 0-100%Vol. The appropriate range should be selected according to the application.
What output signals does the methane sensor support?
The sensor supports UART digital output and 0.4-2V analog voltage output.
How fast is the response time?
The specified response time is T90 below 30 seconds.
Does the MNS-QT331 include temperature compensation?
Yes. The sensor includes temperature compensation to improve measurement stability across changing environmental temperatures.
What is the operating temperature range?
The standard operating range is approximately -40°C to +70°C. Wider or customized operating ranges may be available depending on project requirements.
What applications use an NDIR methane sensor?
Typical applications include methane leak detectors, natural gas alarms, industrial gas detectors, portable gas analyzers, smart gas monitoring devices and OEM combustible gas detection systems.
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