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MiniWRAS 1371
Portable wide-range aerosol spectrometer

The only portable instrument on the market that allows simultaneous and precise real-time monitoring of both micron-sized and nanoparticles. Designed for indoor air quality monitoring. 


Functionality: Optical particle counting combined with measuring the eletrical mobility diameter 

  • Two analyzers in one instrument
    Combination of optical (OPC) and electrical (nanosizer) particle detection
  • One combined data set
    PM10, PM2.5, PM1, inhalable, thoracic, and respirable particle number size distribution
  • 41 equidistant size channels
    From 10 nm to 35 μm
  • Intelligent Li-Ion battery
    For portable use up to 10 hours
  • Flexible data acquisition and communication
    With USB flash drive, Bluetooth and MiniWRAS software
  • Particle free rinsing air design
    For improving detection and reducing signal noise
  • Suitable for various applications
  • No consumables or liquids
    Fully portable, operation irrespective of its position
  • No handling license required
    Non-radioactive unipolar diffusion charging (DC)
  • Compact design
    Allows easy integration in laboratory or mobile setups
  • Easy to use
    • Status control via LEDs
    • Start/stop button for stand-alone operation
  • Workplace monitoring for both ultrafine particles (UFP) and dust mass fractions
  • Nanoparticle source identification
  • Indoor air quality (IAQ) in buildings
  • IAQ in vehicles, airplane cabins, cockpits, busses, trains
  • R+D testing in industry
  • Nanoparticle and PM monitoring (e. g. PM2.5)
  • Technical data
Detection principleDiffusion Charging (DC), electrical mobility based sizing and detection in Faraday Cup Electrometer (FCE)Optical particle counter and spectrometer (OPC) using light scattering at single particles with diode laser (optical)
OutputPM10, PM2.5, PM1, dust mass fractions as per EN 481: Inhalable, thoracic, respirable particle number concentration and size distribution
Particle size range10 nm … 35.15 μm10 … 193 nm (electrical)0.253 … 35.15 μm (optical)
Size channels41 (10 electrical and 31 optical)
Particle number200 … 1,000,000 particles/cm³; depending on charging state (electrical) 0 … 5,300,000 particles/l (optical)
Dust mass concentration0 μg/m³ … 100 mg/m³
Measurement uncertainty nanosizer± 40 % for number concentration and geometric mean diameter (electrical)
Counting efficiency OPC98.2 % for 0.3 μm, 99.5 % for 0.5 μm91.8 % for 1.0 μm, 91.0 % for 5 μmMeets ISO 21501-1 (optical)
Time resolution60 s for 10 channels, 6 s per channel sequentially, storage interval 1 min (electrical)6 s for 31 channels, storage interval 1 min (optical)
Sample flow rate1.2 l/min ± 3 %
Rinsing air (OPC)0.3 l/min dried, particle free air; minimizes noise level in FCE
Rinsing Air (FCE)0.3 l/min dried, particle free air; minimizes noise level in FCE
Power supplyIn: 100 … 240 VAC, 47 … 63 HzOut: 18 VDC, 2.5 A
BatteryIntelligent Li-Ion-battery, 14.4 V, 98 Wh, 6.8 Ah for minimum 10 h operation, recharging: 5 h with power supply
ConnectivityBluetooth, RS-232, USB flashdrive, analog input for meteorological sensors
Operating conditions+ 4 … +40 °C (39 … 104 °F), RH < 95%, non condensing, 533 … 1133 mbar
Transport and storage–20 … +50 °C (–4 … 122 °F) RH < 95 %
Dimensions (H x W x D)34 x 31 x 12 cm (13.4 x 12.2 x 4.7 in)
Weight8.2 kg (18 lbs)
  • Portable, battery-powered wide range aerosol spectrometer without the need for liquids