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Air Sensors

Gravity: Factory Calibrated Electrochemical NO2 Sensor

SKU: SEN0471

The gas sensor series is designed to detect various flammable, combustible, and toxic gases in the environment. With pre-calibrated sensors, it can measure the concentration of specific gases quickly and accurately. Supporting multiple output modes, including Analog, I2C, UART, and digital alarm signals, it offers flexibility in different applications. The probes in this series use electrochemical principles, providing strong stability and sensitivity with a lifespan of up to two years. Using the simple and user-friendly Gravity interface, you can easily build various gas concentration detectors. This sensor series has widespread applications in safety production, industrial manufacturing, and environmental protection, making it the ideal choice for settings such as coal mines, chemical industries, chemical laboratories, and environmental management.

Front of electronic motor and circuit board with microcontroller for C-based sensor-DFRobot product sku:SEN0471 image.
  • Tech Specs
  • Projects

    • Specification

    Parameter Description
    Detection Gas CO, O?, NH?, H?S, NO?, HCl, H?, PH?, SO?, O?, Cl?, HF (different probes required)
    Working Voltage 3.3¨C5.5 V DC
    Working Current < 5 mA
    Output Signal I2C, UART output (0¨C3 V), analog voltage (depending on probe characteristics)
    Detection Error ¡À10% of output value or ¡À5% of full scale (whichever is greater)
    Working Temperature ?20 ¡ãC to 50 ¡ãC
    Working Humidity 15¨C90% RH (non-condensing)
    Storage Temperature ?20 ¡ãC to 50 ¡ãC
    Storage Humidity 15¨C90% RH (non-condensing)
    Lifespan > 2 years (in air)
    Adapter Plate Size 37 ¡Á 32 mm
    Operating Pressure Range 0.5¨C2.0 bar

    Characteristic Parameters

    SKU Type Detection Range Resolution V0 Voltage output range Vout1 Response Time£¨T90)
    SEN0465 O2 (0-25)%Vol 0.1%Vol (1.5-0)V 1.0V@10%vol ¡Ü15S
    SEN0466 CO (0-1000)ppm 1ppm (0.6-3)V 0.9V@200ppm ¡Ü30S
    SEN0467 H2S (0-100)ppm 1ppm (0.6-3)V 1.5V@50ppm ¡Ü30S
    SEN0468 Cl2 (0-20)ppm 0.1ppm (2-0)V 1.3V@10ppm ¡Ü60S
    SEN0469 NH3 (0-100)ppm 1ppm (0.6-3)V 1.4V@50ppm ¡Ü150S
    SEN0470 SO2 (0-20)ppm 0.1ppm (0.6-2.4)V 1.5V@10ppm ¡Ü30S
    SEN0471 NO2 (0-20)ppm 0.1ppm (2-0)V 1.2V@10ppm ¡Ü30S
    SEN0472 O3 (0-10)ppm 0.1ppm (2-0.7)V 1.3V@5ppm ¡Ü120S
    SEN0473 H2 (0-1000)ppm 1ppm (0.6-3)V 1.3V@500ppm ¡Ü120S
    SEN0474 HCL (0-10)ppm 0.1ppm (2-0.7)V 1.4V@5ppm ¡Ü60S
    SEN0475 HF (0-10)ppm 0.1ppm (2-0.5)V 1.3V@5ppm ¡Ü60S
    SEN0476 PH3 (0-1000)ppm 0.1ppm (0.6-3)V 0.7V@50ppm ¡Ü30S

    Explanation of VO use:
    VO: It means original voltage (linear) after amplifying circuit, rather than concentration value of current environment.

    Calculation method: concentration in the current environment N= 200/(Vout1-Vout0)*(Voutx-Vout0)

    Where Vout1 corresponds to Vout1 in the table and Vout0 corresponds to the voltage value of the gas at 0 ppm in the table. Take CO as an example: zero point voltage Vout0 = 0.6V, Vout1 = 0.9V, the current voltage of VO Voutx = 1.2V, then the current concentration in the environment N = 400ppm

    The analog output is the original uncalibrated voltage of the probe, the UART/I2C data is factory calibrated, if there is no special requirement, it is recommended to use the calibrated UART/I2C data.

    Pinout

    Board Overview

    Smart Gas Sensor Terminal Pinout

    Label Name Function description
    1 D/T I2C data line SDA / UART data transmitting-TX
    2 C/R I2C clock line SCL / UART data receiving-RX
    3 - GND -
    4 + Power supply + (3.3-5V compatible)

    Additional Pinout

    Label Name Function description
    1 VCC Positive power supply (3.3-5V compatible)
    2 GND GND negative power supply
    3 V0 The raw voltage output of the gas probe. You can develop your own conversion algorithm based on the original output.
    4 ALA Threshold alarm function, the threshold can be set through API, when exceeding this value, the pin will output high level.
    5 NA Reserve custom pins, you can contact us for custom functions.

    FAQ

    • After a long measurement period, my gas sensor returns data of 0 ppm or beyond the range?

      Please check if the version of your adapter board is V1.0. There is a hardware bug on some of the V1.0 board that could cause this problem.

      Please turn to our TechSupport team for the after-sale service.

    • Why does the serial monitor output "No Device!" when using a multi-gas sensor?

      If you are using our sample code, check that the onboard dial is the same as the I2C address filled in the code.
      And SEL code needs to dial to 0 to communicate using I2C.

    • How long is the lifespan of a multi-gas sensor probe?

      If used in normal air, the probe has a normal life of up to 2 years. However, if the probe is exposed to a high concentration of the measured gas environment for a long time, it will lead to accelerated consumption of the electrolyte in the probe. Thus the probe life is shortened.

    • Hi, I'm considering using this for atmospheric composition measurements. Can this detect ppb level concentrations?

      Hi, the resolution for the NO2 sensor is 0.1ppm=100ppb.

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