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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 airports. 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 vith GSM Module 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. Other gases (H2S, VOC) configurable
    • 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 an optional 2/3G modem
    • 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
    HTTP (open API), SMS, Modbus, ASCII
    Serial data interface
    RS-485
    Console interface
    RS-232
    2/3G connection for Internet protocols
    Quad-band 850/900/1800/1900 MHz GSM/GPRS/EDGE + 2100 MHz UMTS
    Power and data connector
    Standard 8-pin M12 male
    Operating voltage
    8 — 30 VDC
    Power consumption
    Typ. 0.5 W, max. 2 W
    Operating environment
    -30 — 50 °C, RH 15 — 95 %
    Protection class
    IP65
    Enclosure materials
    Anodized aluminum, stainless steel
    Dimensions
    128(w) x 185(h) x 128(d) mm
    Weight
    1250 g (without 2/3G modem)
    Warranty
    2 years (sensors not included)

    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
    Particle counter channels
    PM2.5 and PM10
    Particle counter resolution
    1 μg/m3
    Sampling interval
    1 — 1440 minutes
    Response time
    <60 seconds
    Factory calibration
    1-3 years depending on sensor configuration
    ​​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
    NO 0 — 2 0.005 ±0.001 <±1 % FS <±1 % FS ppm
    H2S 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 range
    0.3 — 20 μm (spherical equivalent)
    Response time
    <60 s
    Internal channels
    16
    Sampling interval
    10 s
    Sample flow rate
    0.5 SLM (integrated vacuum pump)
    Count rate
    10 000 particles/s
    Units
    μg/m3

    Conformity

    EMC
    IEC/EN 61326-1, IEC/EN61000-4-2/3/4/5/6, CISPR 22I
    GSM/UMTS
    FCC 47 parts 15 and 24, EN 301 511, EN 301 489-1/7, EN 60950-1:2006
    Reference methods
    EN 14211:2005, EN 14626:2005, EN 14625:2005, EN14212:2005, EN 12341, EN 14907​​​