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Cubic Sensor and Instrument Co.,Ltd
INFRARED METHANE (CH4 ) GAS SENSOR

INFRARED METHANE (CH4 ) GAS SENSOR

Product catalog summary

Introduction
The document describes the Infrared Methane (CH4) Gas Sensor developed by Wuhan Cubic Optoelectronics Co., Ltd. This sensor utilizes advanced non-dispersive infrared (NDIR) technology, making it suitable for safety and alarming devices, environmental monitoring, and gas drainage monitoring. It complies with Ex-proof Exia CT4 standards, with certificate No. GYB101873.

Working Principle
The sensor operates based on the absorption spectrum of CH4 gas in the infrared range, following Lambert-Beer's Law. The mathematical model involves the absorption intensity of infrared light as it passes through the gas, described by the formula I = I0e^-kpl, where I0 is the intensity of the incoming ray, I is the transmitted beam, l is the thickness of the gaseous medium, p is the gas concentration, and k is the absorption coefficient.

Features

High sensitivity and fast response
Immune to poisoning and long lifespan
Self-compensation for temperature and reliable linearity output
Choice of output format: voltage and RS232
Good sensitivity and selectivity to CH4
Can replace compatible pellistor-based instruments

Specifications

Working voltage: 3.5-6VDC
Working current: 75-80mA
Output voltage: 0.4V-2VDC
Measurement range: 0-5% or 0-100% vol
Resolution: 0.01% for 0-5% vol, 0.1% above 10% vol
Accuracy: ≤±0.1% for 0-1%, ≤±10% for 1-100%
Response time: T90 <25s
Working temperature: -40 to 70°C
Storage temperature: -40 to 85°C
Humidity range: 0-95% RH non-condensing
Lifespan: >5 years
Weight: 15g

Applications
The CH4 sensor is suitable for integration into safety and alarming devices such as gas detectors and transmitters. It is widely used in environments with flammable and explosive gas hazards, including mines, metallurgy, liquefied gas stations, and more. It is also applicable in gas leakage detection equipment for both family and industrial use, avoiding interference from alcohol, cooking fumes, and cigarette smoke.

Connection and I/O Definition
The sensor can be directly connected to a CPU powered by 2.5-3.3V. For a 5V CPU, adjustments are needed. The I/O definition includes VCC (DC3.5V-6V), digital output (TTL electrical level), and a baud rate of 9600bps with 8 data bits, 1 stop bit, and no check bit.

Catalog excerpts

INFRARED METHANE (CH4 ) GAS SENSOR Wuhan Cubic Optoelectronics Wuhan Cubic Optoelectronics Co. ， Ltd Co. ， Ltd Add:Fenghuang No.3 Road, Fenghuang Industrial ： Fenghuang No.3 Road, Fenghuang ADD Park,Eastlake Hi-tech Industrial Zone,Wuhan 430205, China DevelopmentPark,Eastlake Hi-tech Development Zone, Tel: Wuhan, 430205, China 86-27-81628831 TEL ： +86-27-87405251 Fax: 86-27-87405251 FAX ： +86-27-87401159 www. GasSensor.com.cn info@gassenso

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Working principle  CH4 gas is composed of different types of atoms have absorption spectrum in infrared range. Absorption intensity abides by Lamber-Beer’s Law. Basic working principle of NDIR sensor is as below, Inlet detector Light spectral filter  Basic mathematical model ： A majority of both organic and inorganic polyatomic gas have specific absorptive wavelength in infrared region. It observes Lambert-Beer Law formula I ＝ I0e-kpl when infrared light is coming through. Light absorption intensity “i” can be described as i=I0-I= I0 (1- e- kpl). I0: intensity of incoming ray. I: transmitting...

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♦ NDIR CH4 gas sensor adopts advanced non-dispersive infrared technology and qualified raw materials and parts, which can be integrated in safety and alarming devices, able to be used for environmental monitoring, gas drainage monitoring; ♦ The infrared methane sensor is complied with Ex-proof ExiallCT4. The certificate No. is GYB101873

Open the catalog to page 3

■ NDIR gas sensor ■ High sensitive and fast response ■ Immune from "poisoning" and long life ■ Self-compensation of temperature and reliable linearity output ■ Choice of output format — voltage and RS232 ■ Good sensitivity and selectivity to CH4 ■ Replacement of compatible pellistor based instruments to NDIR CH4

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APPLICATION CH4 sensor can be integrated in such safety and alarming devices such as CH4 gas detector and transmitter which are widely used in various occasions with flammable and explosion hazard gas. · Mine, metallurgy, liquefied gas station, spray paint, petroleum, fuel gas transport etc ·Used in gas leakage detecting equipment in family and industry, are suitable for CH4, LNG, avoid the noise of alcohol and cooking fumes and cigarette smoke. · Gas concentration meter, detect concentration of CH4 in air · Gasoline, ketone, benzene etc organic solvent. · Combustible gas leaking alarm or detectors....

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Digital output : TTL electrical level voltage signal is 0 or 2.5v , pay attention to level switching when connecting external circuit, computer circuit is illustrated below : Baud rate : 9600bps Data bit : 8 ; Stop bit : 1 A. If CPU is powered by 2.5 - 3.3V, CH4 gas sensor can be connected directly and make communication. Note: RXD of CH4 gas sensor is connected to TXD of CPU. TXD of CH4 gas sensor is connected to RXD of CPU. B. If CPU is 5V, please change PWL. Here is for reference:

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INFRARED METHANE (CH4 ) GAS SENSOR

INFRARED METHANE (CH4 ) GAS SENSOR

Catalog excerpts

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