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Vaisala Air Quality Transmitter AQT420

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    Overview

     Overview

    Vaisala Air Quality Transmitter AQT420 measures the most common gaseous pollutants nitrogen dioxide (NO2), sulphur dioxide (SO2), carbon monoxide (CO) and ozone (O3 ) with default configuration, plus Particulate Matter (PM2.5 and PM10 ) in the ambient air. The AQT420 measurement performance is based on proprietary advanced algorithms that enable ppb measurements at an affordable price using electrochemical sensors. The algorithms compensate the impact of ambient conditions and aging on the sensor elements and remove the need for costly gas sampling and conditioning equipment.

    AQT420 has been specifically designed for air quality monitoring networks in urban areas, road networks or around industrial sites and transportation hubs. Thanks to its small weight and compact size it is ideally suited for deployment even in large air quality networks. The measurement data is sent wirelessly to a web-based database with GSM Gateway or is available locally via a serial interface. Depending on local conditions the AQT420 has a maintenance and calibration interval of 12-24 months.

    Applications

    • Urban air quality networks
    • Industrial emission monitoring
    • Safety monitoring
    • Roadside and tunnel monitoring
    • Mobile measurement
    • Building automation
    • Air quality research

    Features

    • Measures up to four most common air pollutants NO2, SO2, CO and O3.
    • Intelligent algorithms that compensate for aging and environmental conditions
    • Compact design, easy to deploy in the field
    • Low power consumption (typically 0.5W)
    • Wireless Internet connection with Multi-Observation Gateway
    • RS232 and RS485 interfaces for local connectivity (eg. Modbus support)
    • Easy integration and open API
    Technical Specifications

     Technical Specifications

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    General

    Data protocols
    Modbus, ASCII
    Serial data interface
    RS-485
    Console interface
    RS-232
    Power and data connector
    Standard 8-pin M12 male
    Operating voltage
    8 — 30 VDC
    Power consumption
    Typ. 0.5 W, max. 2 W
    Protection class
    IP65
    Enclosure materials
    Anodized aluminum, stainless steel
    Dimensions
    128(w) x 185(h) x 128(d) mm
    Weight
    1250 g

    Measurement Specifications

    Temperature range
    -40 — 85 °C
    Temperature resolution
    0.1 °C
    Temperature accuracy
    ±0.3 °C, repeatability ±0.1 °C
    Humidity range
    0 — 100 %RH (non-condensing)
    Humidity resolution
    0.1 %RH
    Humidity accuracy
    ±2 %RH, repeatability ±0.2 %RH
    Pressure range
    800 — 1100 mbar
    Pressure resolution
    1 mbar
    Pressure accuracy
    <±1 % FS
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    Air Quality Measurement Specificat​ions

    Temperature range
          -30 — 50 °C
    Humidity range
            15 — 95 %RH (non-condensing)
    ​​Gas Measurement Specificat​ions
    G​AS RANGE MIN.
    DE​TE​CTION
    RESO-
    LUTION
    PRECI-
    SION
    LINEA-
    RITY
    UNIT
    SO2 0 — 2 0.005 ±0.001 <±1 % FS <±1 % FS ppm
    NO2 0 — 2 0.005 ±0.001 <±1 % FS <±1 % FS ppm
    CO 0 — 10 0.01 ±0.01 <±2 % FS <±2 % FS ppm
    O3 0 — 2 0.005 ±0.01 <±3 % FS <±2 % FS ppm

    Particle Measurement Specifications

    Particle counter channels
          PM2.5 and PM10
    Particle range
    0.3 — 20 μm (spherical equivalent)
    Response time
    <60 s
    Sampling interval
    1 — 1440 minutes
    Sample flow rate
    0.5 SLM (integrated vacuum pump)
    Units
    μg/m3
    Measurement range for PM2.5
    0 — 2000 μg/m3
    Measurement range for PM10
    0 —5000 μg/m3
    Measurement resolution
    0.1 μg/m3

    Conformity

    EMC
    IEC/EN 61326-1, IEC/EN61000-4-2/3/4/5/6, CISPR 22I