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    • Home
    • Environmental Sensors
      • Humidity Sensors
        • Digital Humidity Sensor SHT4x (RH/T)
        • Digital Humidity Sensor SHT3x (RH/T)
        • Digital Humidity Sensor SHT85 (RH/T)
        • Digital Humidity Sensor SHTC3 (RH/T)
        • Digital Humidity Sensor SHTC1 (RH/T)
        • Digital Humidity and Temperature Module SCC30-DB (RH/T)
        • SF2 Filter Cap
        • SHT31 Smart Gadget Development Kit
        • Digital Humidity Sensor SHTW2 (RH/T) (NRND)
      • Temperature Sensors
        • Temperature Sensor STS3x
        • Temperature Sensor STS32
      • Multi-Pixel Gas Sensors SGP
        • VOC Sensor SGP40
        • VOC Sensor SGP30 / SGPC3 (NRND)
        • Multi-Gas, Humidity and Temperature Module SVM30 (NRND)
      • Particulate Matter Sensor SPS30
      • Carbon Dioxide Sensors
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      • CO2 Sensor STC31

        The most efficient way to measure high CO2 concentrations

        The STC31 is a chip-sized gas concentration sensor for high range, accurate CO2 measurements designed for high-volume production. The sensor is based on a revolutionized thermal conductivity measurement principle, which results in superior repeatability and long-term stability. This makes the STC31 the perfect choice for applications where reliability is key.

        More

    • Flow Sensors
      • Liquid Flow Meters
        • Lx – Compact Liquid Flow Meters
          • Liquid Flow Meter LG16
          • Liquid Flow Meter LG01
          • Liquid Flow Meter LS32-1500
        • SLx – Standalone Liquid Flow Meters
          • Liquid Flow Meter SLI
          • Liquid Flow Meter SLG
          • Liquid Flow Meter SLQ-QT105
          • Liquid Flow Meter SLQ-QT500
          • Liquid Flow Meter SLS-1500
        • Liquid Flow Sensor SLF3x
        • Liquid Flow Sensor LPG10
        • Liquid Flow Sensor LD20
        • Liquid Flow Meter Kits
        • Customized (OEM) Liquid Flow Meters
      • Mass Flow Meters for Gases
        • Mass Flow Meter SFM3000
        • Mass Flow Meters SFM3003 and SFM3013
        • Mass Flow Meter SFM3019
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      • Product Highlight

        Evaluation kit for the single-use liquid flow sensor LD20-2600B

        The LD20-2600B single-use liquid flow sensor for fast, precise and reliable measurements of the lowest flow rates in biomedical applications was successfully launched three years ago. The evaluation kit for this OEM liquid flow sensor can now also be purchased online via Sensirion's distribution network.

        Read more

    • Markets
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        • H2 Measurement
      • Medical
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      • Our Markets

        Sensirion Markets Icons

        Experts for Smart Sensor Solutions

        Sensirion's sensors are used in a wide range of markets and different applications. Our high-quality environmental and flow sensors and sensor solutions improve energy efficiency and sustainability. They increase our safety, support our health and raise the quality of life. 

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        Founded in 1998 Sensirion has become the leading manufacturer of flow and environmental sensors solutions. The company now employs people in various countries such as the USA, South Korea, Japan, China, Taiwan, and Germany. The headquarters in Switzerland is responsible for research, development, and production. 

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        Learn more: www.sensirion.com/GPTW

         

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    • Home
    • Environmental Sensors
    • Carbon Dioxide Sensors
    • Carbon Dioxide Sensor STC31

    CO2 Sensor STC31

    The most effective way to measure high CO2 concentrations

    The STC31 is a chip-sized gas concentration sensor for high range, accurate CO2 measurements designed for high-volume production.

    The sensor is based on a revolutionized thermal conductivity measurement principle, which results in superior repeatability and long-term stability. This makes the STC31 the perfect choice for applications where reliability is key. Thermal conductivity technology has an ultra-low power consumption, even compared to low-power optical sensor. This makes it the ideal choice for battery operated applications, delivering top-performance at an absolute minimal power budget.

    The STC31 features a digital I2C interface, which makes it easy to connect directly to a microprocessor. The outstanding performance of these sensors is based on Sensirion’s patented CMOSens® Technology, which combines the sensor element, signal processing and digital calibration on a small CMOS chip. The well-proven CMOS technology is perfectly suited for high-quality mass production and is the ideal choice for demanding and cost-sensitive OEM applications.


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    Download Center

    Here you can find all documents of Sensirion’s gas concentration sensor STC31 for download.


    Sensor Specifications

    Concentration Specifications
    Calibrated forCO2 in N2 and CO2 in air
    Measurement range0 to 100 vol%
    Accuracy< 0.5 vol% (+3% of m.v.)
    Repeatability0.2 vol%
    Resolution16 bit
    Temperature Specifications
    Measurement range-20 to 85 °C
    Resolution16 bit
    Accuracy0.5 °C (10 °C to 50 °C)
    1.5 °C (-20 °C to 85 °C)
    Repeatability0.1 °C
    Electrical Specifications
    Supply voltage2.7 – 5.5 V
    Max. supply current5 mA
    Power consumption (@1 measurement per minute)15 µW

    How you benefit from our technology

    TechnologyBenefit
    CMOSens® Technology designed for mass productionEnables high-volume applications due to unprecedented price-performance ratio that scales with quantities
    Many years of experience in the medical and automotive industriesProven and reliable quality
    Robust and no drift over lifetimeReliable sensor output over product lifetime
    On-chip humidity compensationWorry-free operation at high humidity
    Ultra-low power consumptionLonger battery life and cost savings
    Small chip-sized package (3.5mm x 3mm x 1 mm)Easy to integrate in existing design and portable devices
    Fully calibrated digital output with I2C interfaceEasy hassle-free integration
    Reflow solderableFast, automated and low-cost assembly

    How to reduce food waste?

    Sensing CO2, Humidity and Temperature in Cold Chain Logistics

    The Food and Agriculture Organization of the United Nations has found that one third of all food is wasted. For fruits and vegetables, it is even more tremendous as 45% of all fresh products go to waste. To achieve a reduction of food waste it is crucial to consider the entire supply chain from farm to fork. Many fruits and vegetables, such as bananas, are transported and stored in a controlled atmosphere (CA) to preserve freshness. CA parameters are carbon dioxide (CO2) as well as humidity and temperature (RH/T).

    Click here to learn more about our sensor solutions for food transportation.


    Test our environmental sensors with Sensirion’s evaluation kit

    With plug-and-play hardware, user-friendly viewer software and compatibility with all environmental sensors, SEK-Environmental Sensing makes evaluation easier and faster than ever before. This allows customers to focus on developing innovative sensor applications.

    Learn more


    CMOSens® Technology for Thermal Conductivity

    The STC31 measures the thermal conductivity (TC) of a gas. The measurement takes place inside the sensor cavity, which is protected from the environment by a gas-permeable membrane. Inside the cavity there are a heater and a temperature sensor. The heater heats up the gas and the temperature sensor measures how much of that heat is being transferred. The higher the TC of the gas, the more heat is transferred from the heater to the temperature sensor. 

    CO2 has a lower TC than air. Therefore, a decrease in TC signals a rise in CO2. Building on our extensive knowledge of micro-thermal flow sensors, we developed a gas model at Sensirion to quantify exactly what the CO2 concentration is. This all happens on the chip itself, allowing the STC31 to conveniently outputs a CO2 concentration.


    CO2 Sensor SCD40 for indoor air quality measurements

    The SCD40 represents the first CO2 sensor for indoor air quality measurements in miniature format, which impresses with a space requirement of only one cubic centimeter. This disruptive innovation is based on Sensirion's PASens® Technology and combines minimum size with maximum performance. The SCD40 opens up numerous new possibilities for integration and application. Because of its unmatched size and its unprecedented price-performance ratio, the SCD40 is the sensor of choice for today’s and future CO2 sensing markets such as IoT, automotive, HVAC, appliances and consumer goods.

    Click here to learn more about the SCD40.


    Environmental Sensing

    Environmental conditions have a major impact on our well-being, comfort, and productivity. Sensirion’s sensor solutions provide detailed and reliable data on key environmental parameters such as humidity, temperature, volatile organic compounds (VOCs), particulate matter (PM2.5), and CO2. Environmental Sensing opens up new possibilities to create smarter devices that improve our comfort and well-being as well as increase energy efficiency in a wide variety of applications.

    We accompany you through the entire product development process, from the initial idea to product launch and beyond. Our expertise ranges from prototype construction, design-in support and use-case development to inline testing at the mass production stage.

    More about environmental sensing

    Sensirion Environmental Sensing Infographic

    Related Products

    Sensirion Environmental Sensing Co2 Preview

    CO2 and RH/T Sensor Module

    CMOSens® Technology for IR detection enables highly accurate carbon dioxide measurement at a competitive price.

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