The Highest Class Of Accuracy

Reliable and accurate dust monitoring all year round

The EDM264 is the optimal solution for both short- and long-term, mobile measurements in outdoor areas and at production sites. 

The model EDM264 features a powerful and robust measuring cell based on optical particle counting (OPC) technology with all the advantages that users of our portable aerosol spectrometers are accustomed to.  

The system is embedded in a compact, weatherproof housing equipped with a heated sampling inlet, sigma 2-head, a data logger and meteorological sensor.

The EDM264 provides all fine dust fractions for ambient air measurements: TSP, PM10, PM4, PM2.5, PM1, PMcoarse , calculated with the proven GRIMM enviro-algorithm, as well as six additional dust mass fractions: pm10, pm2.5, pm1, inhalable, thoracic and respirable for IAQ and workplace measurements.  

This versatile instrument performs real-time monitoring of particle number and particle size and provides information on particle surface distribution and dust mass distribution.  

The GRIMM EDM264 has 31 equidistant size channels, which are PSL traceable. A high-end data logger enables data acquisition and wireless communication via LTE, WIFI or wired via Ethernet. Backup copies of the measurement data are stored directly in the device.

The rinsing air function, which protects the illumination and detection optics in the optical cell, increases the reliability and long-term stability of the system. The entire sample volume flow of 1.2 L/min is analysed in the optical cell, providing excellent counting efficiency at low and high concentrations.

With all these features, the EDM264 is a world-leading instrument for precise monitoring of dust masses, particle surfaces and particle number concentrations.

This reliable instrument is an indispensable tool for users, who need to measure aerosol concentrations and air quality outdoors, on construction sites, or at production facilities.


  • Unique measurement range in one device
    TSP, PM10, PM4, PM2.5, PM1, PMCoarse and Total Counts
    Inhalable, thoracic, respirable, pm10, pm2.5 and pm1
  • 31 equidistant size channels
    PSL traceable particle size distribution
  • Long term stability and very low zero drift
    Due to rinse air for protecting laser and detector
  • High-class data logger
    WIFI, LTE, remote access and real-time data analysis
  • Meteorological sensor
    For P, T, RH, wind speed + direction and precipitation
  • GPS position
    For high spatial and temporal resolution


  • Suitable for various applications
    • Mobile PM monitoring
    • Construction site monitoring, fugitive emissions
    • Fence-line monitoring
    • Source apportionment, forest fire detection
  • All in one solution
    Ready to use, rugged design
  • Aerodynamic aerosol focusing
    Total inlet flow (1.2 l/min) analyzed in the optical cell, no border-zone error
  • Cost saving
    Low maintenance
  • Optional accessory
    Interchangeable sampling probe (SVC) withswitchable catalytic stripper for SVC removal

Technical Data


  • TSP, PM10, PM4, PM2.5, PM1, PMCoarse and Total Counts
  • Inhalable, thoracic, respirable, pm10, pm2.5 and pm1
  • Number concentration and size distribution
  • GPS position, meteorological data

particle size range

0.253 ... 35.15 μm

size channels

31, equidistant

particle number

0 - 5 300 000 particles/liter

dust mass

0 μg/m3 ... 100 mg/m3


more than 95% at 500 nm meets ISO 21501-1

time resolution 6 s, selectable storage intervals
6 s, 1, 5, 10, 15, 30 min, 1 h
volume flow rate 1.2 l/min due to self regulation according
to ISO 21501-1, automatic altitude correction up
to 5000 m
rinsing air 0.4 l/min, protects laser optics, reference air for
sampling probe
μ-Sigma-2 inlet and heated sampling pipe


Light scattering at single particles with
diode laser

power supply

85 ... 264 VAC, 47 ... 63 Hz
or 12 VDC, e. g. via solar panel

power consumption


Pmax = 150 W, Imax = 1.4 A

Version-dependent Wattage
- Eco: 43 W
- Pro: 95 W
- SVC Eco: 43 W standard, total of 78 W while heating
- SVC Pro: 95 W standard, total of 120 W while heating

data interfaces

  • Pro Version: Data logger, WIFI, LTE, USB (type B), Ethernet (TCP-IP), USB flash drive with GRIMM software
  • Eco Version: USB (type B), Ethernet (TCP-IP), USB flash drive with GRIMM software


(l x w x h)

  • Housing only:
    44 x 45 x 21 cm (17.3 x 17.7 x 8.3 in)
  • With meteo sensor and sampling probe:
    73 x 51 x 23 cm (28.7 x 20.0 x 9.1 in)



  • Housing only:
    10 kg (22.0 lbs)
  • With meteo sensor and sampling probe:
    15 kg (33.1 lbs)



 -20 ... +40°C (-4 ... 104°F), RH <99%, non-condensing, 533 ... 1133 mbar

and storage

-20 ... +50°C (-4 ... 122°F), RH <95%


  • Configurable meteorological sensor
    • 157L for temperature, relative humidity, barometric pressure
    • 158L plus wind speed and wind direction
    • 159L plus precipitation High-class data logger to upgrade Eco Version
  • Interchangeable sampling probe with catalytic stripper for SVC removal


20 kg (44.1 lbs)



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


High-class data logger to upgrade EDM264 Eco to EDM264 Pro
Stores data on internal SSD drive, micro SD card for backup, LCD display for status information, data transmission via GSM/LTE, WLAN (LTE antenna with cable included)


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.

All EDM264 will be delivered with this user-friendly software.


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