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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 

  • Ultra-wide particle size range from 10 nm to 35 μm
  • PM10, PM2.5, PM1 and particle size distribution, particle surface, and dust mass
  • High precision over 41 equidistant channels
  • No consumables
  • Non-radioactive particle charger
  • Versatile data aquisition and communication interfaces (Bluetooth, USB, RS-232)
  • Easy to use with GRIMM software
  • Optional sensor for temperature and relative humidity
  • Self-test of all optical and pneumatic components for high quality standards
  • Purge air for protecting laser and detector in optical cell
  • Portable
  • Battery-powered
  • Non-radioactive Nanometer particle sizing
  • No need for liquids
  • Nanoparticle and PM monitoring (e. g. PM2.5)
  • Indoor air quality (IAQ) in buildings
  • IAQ in vehicles, airplane cabins, cockpits, busses, trains
  • Nanoparticle source identification
  • Workplace monitoring
  • R&D testing in industry
  • Technical data
Measured parametersDust fractions as per EN 481 (inhalable, thoracic, respirable) PM10, PM2.5, PM1, number concentration and size distribution
Dust mass concentration0 … 100,000 μg/m³
Particle size range10 nm … 35 μm (10 … 193 nm electrical, 0.253 … 35 μm optical)
Size channels41 (10 electrical and 31 optical)
Particle number concentration: 3,000 … 500,000 particles/cm³ (electrical) 0 … 3,000,000 particles/l (optical)
Reproducibility> 97% of total measuring range (optical)
Detection principle opticalLight scattering at single particles
Detection volume aerodynamically focused, no border zone error
Optical cellDiode laser 660 nm
DetectorFast signal processing with 2 μs pulse length, 2x 16 raw data channels
Time resolution6 s, 31 channels (storage interval 1 min)
Detection principle electricalElectrical mobility spectrometer with Faraday cup electrometer
Detector sensitivity0.25 fA
Time resolution: 60 s, 10 channels 6 s each (storage interval 1 min)
Volume flow1.2 l/min, ±3% constant due to self-regulation
Internal purge air flow rate0.4 l/min, protects laser optics, reference air for self-test
OperationGRIMM MiniWRAS software (wireless or data cable)
InterfacesBluetooth, USB, RS-232
Analog inputExternal sensor for temperature and relative humidity
Power supplyIn: 100 … 240 VAC, 47 … 63 HzOut: 18 VDC, 2.5 A
BatteryLi-lon battery, 14.4 VDC, 4.8 Ah for 8 h operation
Dimensions (H x W x D)34 x 31 x 12 cm (13.4 x 12.2 x 4.7 in)
Weight7.6 kg (16.8 lbs)
Operating conditions+4 … +40 °C (39 … 104 °F)RH < 95%, non-condensing
  • Portable, battery-powered wide range aerosol spectrometer without the need for liquids