The Outdoor Wide Range Aerosol Spectrometer

Nano Meets Enviro - A Continuous & Weather-Protected Wide Range System

The EDM 665 Environmental Wide Range Aerosol Spectrometer combines two technologies for particle counting and classifying in one device: the Scanning Mobility Particle Sizer (SMPS+C) with the butanol condensation particle counter for nanoparticles and the approved EDM 180 for the larger fraction.

Designed and specifically built for atmospheric monitoring, the EDM 665 is a unique high-tech system for accurate and highly resolved measurements over the entire particle size range from 5 nm to 32 μmin 31 size channels for EDM 180 and user-selectable number of channels for SMPS+C (e.g. 64 per decade).

The system requires low maintenance, and can be transported and deployed in the field for short and long-term atmospheric monitoring projects. This configuration places the EDM 665 in the leading position of the atmospheric particle monitoring systems.


  • real-time monitoring of the entire particle size range, fully automatic 24/7 monitoring system
  • low maintenance, 30 days unattended operation, remote access
  • energy-efficient, sampling with isothermal drying system
  • high precision with CPC and OPC at low and high concentrations
  • excellent counting statistics and reproducibility
  • low diffusion losses
  • versatile data acquisition and communication (data logger with GSM via internet)
  • self-test of all optical and pneumatic components for high quality standards
  • meteorological sensors for wind speed and direction, precipitation, pressure, temperature and relative humidity
  • instrument parameters secured against data loss


  • atmospheric monitoring of ultrafine particles and dust
  • source identification
  • atmospheric science
  • traffic emission monitoring



measurement principleelectrostatic classification with subsequent detection by condensational growth
particle size rangeselectable
M - DMA   5 – 350 nm
L -  DMA 10 - 1094 nm
minimum scan time150 s

max. concentration single count mode

150 000 p/cm3

max. concentration photometric mode

107 p/cm3

reproducibility> 95% for single count mode
> 90% for photometric mode
working fluidn-butanol (n-butyl alcohol)

Optical Aerosol Spectrometer

measurement principlelight scattering at single particles;
detection volume aerodynamically focused, no border zone error
particle size range0.25 μm - 32 μm
concentration range1 – 3 000 000 p/L
reproducibility> 97% for single particle count mode
sampling and conditioning1 m sampling pipe with sampling head, isothermal humidity extraction via Nafion membrane, sensorcontrolled, without loss of semi-volatile compounds (SVC)
weather housingstainless steel, powder-coated, air-conditioned
climate sensorswind speed and direction, precipitation, pressure, temperature
relative humidity; GPS positioning
total flow rate1.5 L/min, ≤ 5% difference to the nominal flow rate
sample air flow rate SMPS+C0.3 L/min CPC, flow control with critical orifice, temperature stabilized
sample air flow rate EDM1801.2 L/min aerosol spectrometer, ± 3% constant due to


data logger and netbook integrated in housing for online data,
meteorological sensor and GPS position


data logger, USB, GSM with SIM card for mobile network

power supply

230 VAC, 60 Hz

power consumption750 W

temperature range

-20 to +55°C (-4 to 131°F), RH < 95%
pressure rangeSMPS+C: 600 – 1100 mbar,
optical aerosol spectrometer: 900 - 1100 mbar;
flow rate adjustable to pressure
dimensions (h x w x d)housing: 107 x 65 x 224 cm (42.1 x 25.6 x 88.2 in)
total height with meteorological sensor: 270 cm (106.3 in)
weight250 kg (551 lbs)



GPS sensor


sensor for temperature, relative humidity, and barometric pressure


sensor for temperature, relative humidity, barometric pressure, wind speed, and wind velocity


sensor for temperature, relative humidity, barometric pressure, wind speed, wind velocity, and precipitation


Data logger for our measurement equipment including the capability to transmit all data live via GSM onto a password-protected platform


GRIMM developed a powerful software to visualize, process, and import as well as export your valuable measurement data.
This easy-to-use program is compatible to Windows XP and all later versions.

Please contact us for your for free trial version if you already own a GRIMM measurement device or more information if you are in the process of finding your measurement solution.


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