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    • Home
    • Environmental Sensors
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        • Digital Humidity Sensor SHT4x (RH/T)
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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.

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      • Evaluation Kit SEK-Flow Sensing
      • 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.

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        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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    • Multi-Pixel Gas Sensors SGP
    • VOC Sensor SGP40

    VOC Sensor SGP40

    Sensirion’s Future of MOX Technology

    The SGP40 is Sensirion’s new digital VOC (volatile organic compounds) sensor designed for easy integration into air purifiers or demand-controlled ventilation.

    SGP40 is Sensirion’s new digital VOC (volatile organic compounds) sensor designed for easy integration into air treatment devices and air quality monitors. Based on Sensirion’s CMOSens® Technology, the SGP40 offers a complete sensor system on a single chip and features a digital I2C interface, a temperature-controlled micro-hotplate and a humidity-compensated indoor air quality signal. In combination with Sensirion’s powerful VOC Algorithm (part of the SGP40 VOC Index driver package), the sensor signal can be directly used to evaluate indoor air quality, e.g., for triggering the gradual fan control of an air treatment device. Both the SGP40 chip and VOC algorithm feature unrivalled robustness in the final application over their lifetimes. Pushing the multipixel and multi-hotplate approach to the next level of individual control of each sensing element, the SGP40 enables a drastic reduction in power consumption, making it suitable for battery-driven applications as well. Sensirion’s state-of-the-art production process guarantees high reproducibility and reliability.


    Features

    InterfaceI²C
    Supply voltage range1.7 to 3.6 V
    Current consumption2.6 to 3.5 mA (at 3.3 or 1.8 V respectively)
    Measurement range          
    0 to 1,000 ppm of ethanol equivalents
    Sensor output  
    Digital 16-bit raw signal
    Processed output
    Digital VOC Index signal
    Response time                                     
    < 10 s (tau 63 %)
    Limit of detection< 0.05 ppm of ethanol equivalents or < 10 % of concentration setpoint (whichever is larger)

    Switch-on time < 60 s
    On-chip humidity compensation Yes

    Applications

    • Air purifiers
    • Kitchen hoods
    • Demand-controlled ventilation
    • Thermostats
    • Indoor air quality monitoring

    Download Image

    Download Center

    Here you can find all documents of Sensirion's VOC sensors for download.


    Sensor Specifications

    NameSensor OutputDevice-to-Device VariationSupply Voltage VInterfacePackage Size (L x W x H) mmDatasheetBuy
    SGP40Digital raw signal, VOC Index1< ± 15% m.v.21.7 to 3.6 VI2C2.44 x 2.44 x 0.85Download

    1VOC Index is the processed raw signal by Sensirion’s VOC Algorithm.
    2Or 15 VOC Index points, whichever is larger.


    Key Features

    The SGP40 sensor has essential features that help users assess and improve air quality. Down below the three main indicators are listed as well as technology features and their benefits.

    1. Complete sensor solution for detecting VOC events2. Proven performance improved3. Reliable and accurate long-term user experience
    Simple interface, powerful VOC Algorithm 2nd generationRobust hardware
    Easy integration of driver packageLow device-to-device variation under field or lab conditionsStable and repeatable signal output over lifetime
    Processed signal allows automatically for evaluating indoor air quality relative to average environmentFast start-up behaviorSmart adaptation to any indoor environment

    Technology and Benefits

    TechnologyBenefits
    Excellent longevity of > 10 yearsReliable sensor hardware
    VOC Index driverNo signal processing programming by customer required
    On-chip humidity compensationOptimal performance in various environments
    Low heat emissionEnhanced precision of RH&T readings, less backgrounds
    Small footprintFits into every device
    High sensitivity to almost all VOCsBroadband sensor that reacts well to typical VOCs

    Average power consumption down to 2.6 mA/6 mW

    Suitable for battery-powered devices
    Voltage range of 1.7–3.6 VSuitable for both mobile and hardwired devices
    Digital I2C interfaceBest performance-to-price ratio

    Typical MOX Sensors vs. SGP40

    User ExperienceTypical MOX SensorSGP40
    Excellent device-to-device variation in the field
    Differentiation between fresh air and bad air events
    Output independent on sensor age, starting conditions and environment
    Reliable and stable sensor signal over lifetime (> 10 years)

    Start evaluating the SGP40 today

    The SEK-SVM40 evaluation kit has been designed for easy and cost-efficient evaluation of Sensirion’s SGP40 VOC sensor. The kit contains the SVM40 sensor module and is equipped with an SGP40, an SHT40 humidity sensor and a microcontroller featuring VOC Index, relative humidity and temperature outputs via either an I2C or UART interface.

    In addition to the SVM40, the SEK-SVM40 comes with a UART-USB cable that allows, e.g., for evaluation of the sensors by Sensirion’s easy-to-use SEK-ControlCenter viewer software as well as a 6-pin jumper wire cable that enables fast prototyping, e.g., through integration into existing platforms (like Arduino, Raspberry Pi, etc.).

    The software and relevant documentation can be downloaded from our website. Create your own SEK-Evaluationkit: www.sensirion.com/sek


    Indoor air quality and volatile organic compounds

    Good air quality in our living and working environments is becoming increasingly important because most people nowadays spend 90% of their time indoors. VOCs are one of the main contributors to bad air quality, and awareness of them among individuals and governments has been increasing. Modern building materials and methods result in better insulation, and thus improved energy efficiency, but they also limit air exchange with the outside world and hence lead to higher VOC concentrations indoors. Exposure to high and/or hazardous levels of VOCs can be avoided by appropriate ventilation or by identifying and eliminating the pollution source. Sensirion’s SGP40 is a broad-band VOC sensor which reliably detects high-VOC events. When built into an air quality monitor, it allows users to identify the sources of such events and take appropriate action. Integrated into smart air treatment devices, it enables automatic, demand-controlled operation.

    Sensirion’s powerful VOC Algorithm (part of the SGP40 VOC Index driver package) analyzes VOC events detected by the SGP40 sensor and maps them to a VOC Index. This VOC Index provides a practical quantification of VOC events relative to each individual sensor’s typical indoor environment. In this way, it behaves similarly to the human nose, which is highly susceptible to changes in odor, but it also detects VOC events that are not perceived by humans. The VOC Index indicates to what extent the indoor air quality has deteriorated or improved compared to the sensor’s typical VOC environment. This information can be used, e.g., for gradually controlling the fan of an air treatment device or to provide users with feedback on their daily activity profile.


    Unique performance thanks to MOXSens® technology

    The sensing principle of the SGP is based on a heated film of metal-oxide (MOx) nanoparticles. Adsorbed oxygen on the metal-oxide particles reacts with the target gas and thereby releases electrons. This results in a change of the electrical resistance of the metal-oxide layer that is measured by the sensor.

    The SGP multi-pixel gas sensor platform integrates four sensing elements − the pixels – into one small DFN package. Using Sensirion’s CMOSens® Technology, the SGP offers a complete sensor system on a single chip featuring a digital I2C interface, a temperature-controlled microhotplate, as well as preprocessed and calibrated indoor air quality signals.

    Optimized metal-oxide sensing materials in combination with Sensirion’s multi-pixel gas measurement platform result in a unique resistance against contamination by siloxanes – MOXSens® Technology. Sensirion’s MOXSens® Technology enables highly sensitive and reliable gas measurements of indoor air pollutants such as volatile organic compounds and hydrogen.


    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

    Digital Humidity Sensor SHTC3 (RH/T)

    The SHTC3 digital humidity sensor will feature a broad supply voltage range (1.62-3.6 V) and has been designed specifically for the consumer electronics industry.

    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.

    Particulate Matter Sensor SPS30

    The SPS30 particulate matter (PM) sensor enables accurate measurements from the device’s first operation and throughout its lifetime of more than eight years.

    Technical Documents

    • Brochure Environmental Sensing VOC

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