INFRARED (NDIR) CO2 GAS SENSOR

Product catalog summary

Introduction
The document introduces the Infrared (NDIR) CO2 gas sensor developed by Wuhan Cubic Optoelectronics Co., Ltd. This sensor is designed to detect and monitor carbon dioxide gas in the air using non-dispersive infrared (NDIR) technology, which relies on the absorption of infrared light by CO2 molecules.

Features

High sensitivity and fast response due to diffusion sampling.
Low power consumption with precise measurement and stable performance.
Includes a temperature sensor for compensation.
Good immunity to interference from other gases and humidity.
Offers multiple output formats: voltage and RS232.
Self-monitoring and diagnostic features enhance ease of use.

Applications
The CO2 sensor can be integrated into safety and alarming devices used in various fields such as medical, environmental monitoring, HVAC, greenhouses, automotive, mining, and more.

Specifications

Measurement range: 0-5000ppm or 0-10%vol.
Working current: 75-80mA.
Output voltage: 0.4V-2VDC.
Working voltage: 3.5-6VDC.
Resolution: 10ppm for 0-5000ppm range; 0.01% for 0-10%vol range.
Accuracy: Error ≤±0.1% for 0-0.5% range; ≤±0.05%+5% of readings for >0.5% range.
Response time: T90 <25s.
Zero repeatability: ±1%FS at 20℃.
Zero drift: 2%/month.
Operating temperature: -20℃ to 55℃.
Storage temperature: -40℃ to 585℃.
Humidity range: 0 to 95% RH non-condensing.
Standard baud rates: 9600bps, 19200bps, 38400bps.
Dimensions: Φ20 x 19mm (excluding pins).
Lifespan: >5 years.
Weight: 15g.

Connection and I/O Definition
The sensor can be connected directly to a CPU powered by 2.5 – 3.3V. For a 5V CPU, adjustments are needed. The sensor's VCC is DC3.5V～6V, with a recommended VCC of 5V. It uses TTL electrical level for digital output, with a voltage signal of 0 or 2.5V.

Typical Application
The sensor is suitable for CO2 monitoring and alert solutions in environments such as refrigerators, cold rooms, freezers down to -80°C, nitrogen tanks, and incubators.

Catalog excerpts

INFRARED (NDIR) CO2 GAS SENSOR Wuhan Cubic Optoelectronics Co.，Ltd Ltd Wuhan Cubic Optoelectronics Co.， Add:Fenghuang No.3 Road, Fenghuang Industrial ADD：Fenghuang No.3 Road, Fenghuang Industrial Park,Eastlake Hi-tech Development Zone, Park,Eastlake Hi-tech Development Zone Wuhan 430205, China Wuhan, 430205, China Tel: 86-27-81628831 TEL：+86-27-87405251 Fax: 86-27-87405251 FAX：+86-27-87401159 www. GasSensor.com.cn info@gassensor

Open the catalog to page 1

What's NDIR technology? • NDIR CO2 gas sensor instruments measure carbon dioxide concentration by relying on one of the natural properties of CO2 molecules: CO2 molecules absorb light at a specific wavelength .This wavelength is in the infrared range. High concentrations of CO2 molecules absorb more light than low concentrations. This technique is called non-dispersive infrared (NDIR) detection. Refer to the schematic diagram, showing the major components of the NDIR CO2 sensor. Gas outlet Rear expansion + chamber Measurement sell chamber. Front expansion \ Detector Mass flow sensor Infrared...

Open the catalog to page 2

Introduction Infrared CO2 sensor is a sensor designed to detect and monitor carbon dioxide gas in air using non-dispersive infrared (NDIR) technology. Feature • Diffusion sample, high sensitive , fast response • Low power consumption, precise measurement and stable performance • Temperature sensor inside could be for temperature compensate • Good immunity to other gases and humidity • Choice of output format — voltage and RS232 • Self-monitoring and diagnostic features-enhanced ease of use

Open the catalog to page 3

Application CO2 sensor can be integrated in such safety and alarming devices such as CO2 gas detector and transmitter which are used for medical, environmental monitoring, HVAC, greenhouse, underground garage ,automotive, mining, refrigeration plant, tunnels, confined spaces, shipping containers, car parks, industrial plant rooms etc

Open the catalog to page 4

Connection 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 Check bit：null I/O definition VCC：DC3.5V～6V (recommend: VCC=5V） A. If CPU is powered by 2.5 – 3.3V, CO2 gas sensor can be connected directly and make communication. Note: RXD of CO2 gas sensor is connected to TXD of CPU. TXD of CO2 gas sensor is connected to RXD of CPU. B. If CPU is 5V, please change PWL. H

Open the catalog to page 6