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    Carbon Dioxide Sensor

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    Infrared CO2 Sensor Module, UART/ PWM output

    Resonale price Infrared CO2 sensor module with UART/ PWM two output signal for selection, available measuring range 400~2000 ppm/ 400~5000 ppm/ 400~10000 ppm, working voltage 5VDC. The NDIR CO2 sensor can be used to monitor production processes in smart homes, agricultural greenhouses and animal husbandry.

    NDIR CO2 Gas Sensor, 0 to 2000/ 5000 ppm

    Lower cost NDIR CO2 sensor for sale online. The carbon dioxide sensor with wide range measuring range from 0 to 5000 ppm, working voltage 5VDC, UART/ PWM two output signal can be chosen. Infrared carbon dioxide sensors are widely used in various occasions where flammable and explosive gases exist.

    NDIR CO2 Sensor Module, 0 to 10000 ppm

    High accuracy NDIR CO2 sensor module has optional measuring range of 0~10000ppm, UART/ PWM two output signals are optional. A carbon dioxide sensor is a high-performance product that closely combines mature infrared absorption gas detection technology with precise optical path design and precise circuit design.

    NDIR CO2 Sensor Module, 400-2000/ 5000/ 10000 ppm

    Cost-effective NDIR CO2 sensor module has optional measuring range 0/400~2000/ 5000/ 10000, peak current 125 mA, average current less than 40 mA, UART/ PWM/ 0.4-2V DC three output signals for selection. CO2 gas sensor built-in temperature compensation; digital output and analog voltage output at the same time, easy to use.

    Industrial NDIR CO2 Sensor for HVAC, 0 to 2000/ 6000 ppm

    SKU: ATO-ICDS-411D
    Industrial NDIR CO2 sensor at affordale price for sale. The CO2 sensor HVAC with measuring range 0~2000 ppm/ 0~6000 ppm/ 0~1% VOL/ 0~3% VOL/ 0~5% VOL can be chosen, UART/ analog voltage signal two output method are available. The industrial CO2 sensor is widely used for HVAC refrigeration, industrial-process control and safety protection, agriculture and animal husbandry.

    Carbon Dioxide (CO2) Sensor for Home, 0 to 1%/ 3%/ 5% Vol

    SKU: ATO-ICDS-711A
    Carbon dioxide sensor online for sale at reasonable price. NDIR CO2 sensor has optional wide mesuring range from 0 to 5% Vol, working voltage 4.5~5.5VDC, IIC/ 0.4-2V DC two output signals, fast response time less tha 30 seconds. Infrared co2 sensor is widely used for industrial field instrumentation, industrial-process control and safety protection.

    A carbon dioxide sensor is a machine used to detect the concentration of carbon dioxide. NDIR CO2 sensors monitor and detect the presence of carbon dioxide based on the absorption of specific wavelengths of infrared light. online store offers CO2 gas sensor with wide measuring range from 0~6000 ppm/ 0~100% Vol, which has UART/ PWM output signals. CO2 sensor offers performance advantages over other detection techniques by providing enhanced long-term stability, accuracy, and low power consumption for CO2 measurements. The carbon dioxide gas sensor uses the principle of non-dispersive infrared (NDIR) to detect CO2 in the air. It has good selectivity and no oxygen dependence. Infrared carbon dioxide sensor is widely used in various occasions where flammable and explosive gases exist.

    What is CO2 sensor?

    A carbon dioxide (CO2) sensor is a device used to measure the concentration of carbon dioxide gas in the atmosphere. NDIR CO2 sensor is measured in "parts per million" (ppm), usually around 400 ppm. Carbon dioxide, a colorless, odorless gas, has long been considered one of the key "greenhouse" gases that affect Earth's atmosphere. This gas, along with methane, nitrous oxide and fluorinated gases, forms a barrier in the upper atmosphere, allowing heat to be retained. This leads to rising temperatures, rising sea levels and changes in land use. Carbon dioxide is produced during respiration, combustion and organic decomposition and is also present indoors. This is the result of internal production caused by the presence of external atmospheric carbon dioxide and people.

    How does a carbon dioxide sensor work?

    NDIR CO2 sensors monitor and detect the presence of carbon dioxide based on the absorption of specific wavelengths of infrared light. CO2 sensors include infrared sources, lamps, bandpass filters, and detectors. The target gas is determined by filter wavelength selection. For CO2, the most commonly used wavelength is 4.26 µm. This wavelength is simply not absorbed by other common gases or water vapor, greatly reducing cross-sensitivity and effects on moisture and humidity.

    Normal operation of an carbon dioxide sensor involves pumping or diffusing gas into a light pipe. The electronics then measure the absorption of characteristic wavelengths of light. The amount of light absorption is converted to an electrical output that provides parts per million (ppm) or % volume measurements. In short, more light absorbed means more target gas molecules are present, which results in a lower output signal and a higher reported CO2 concentration.

    carbon dioxide sensor working principle

    What are the types of CO2 sensors?

    The main types of CO2 sensors on the market fall into three categories:

    • Non-dispersive infrared sensor
    • Electrochemical sensors
    • Metal oxide semiconductor sensor

    Non-Dispersive Infrared (NDIR) Sensor

    Simply put, NDIR sensors use specific wavelengths of light to measure carbon dioxide levels in the air. Every element on Earth absorbs certain types of light. For example, carrots reflect orange light but absorb all other colors. Because the light is absorbed, it has no chance for our eyes to see. When things are broken down into atoms and molecules, we can determine what kind of light each absorbs, even the light we can't see.

    Electrochemical Sensor

    Electrochemical carbon dioxide sensors measure electrical current or conductivity to determine how much carbon dioxide is present in the air. When CO2 enters the sensor, it undergoes a chemical reaction within the sensor. When this reaction occurs, the sensor undergoes an electrical change. Depending on the specific type of sensor, the reaction can cause the sensor to receive current, change an existing current, or change the sensor's ability to carry current. The sensor will then use the type and amount of electrical change to determine how much carbon dioxide is present.

    Metal Oxide Semiconductor (MOS) Sensor

    The MOS CO2 sensor uses the resistivity of metal compounds to measure the gas content in the air. Resistivity is the ease with which current flows through something. Therefore, materials such as copper, which are used in large quantities in wiring, will have a lower resistance than the rubber used to stop the current flow.