The all-purpose 11-D: Decode Your Dust

The model 11-D, in its compact and rugged design, combines all advantages of the previous portable GRIMM aerosol spectrometers with the improved optical detection, long-term battery operation, and facilitated handling.

This configuration places the 11-D in the leading position of the portable aerosol spectrometers for monitoring inhalable, thoracic and respirable dust, PM values, and particle number concentration.

The 11-D is the optimal solution for reliable, flexible and real-time measurements for aerosol research and indoor air quality, e. g. at workplaces, interior of vehicles, or for process analysis.


  • Enviro algorithm: TSP, PM10, PM4, PM2.5 PM1, PMcoarse | IAQ algorithm: pm10, pm2.5, pm1, inhalable, thoracic, respirable
  • real-time monitoring of particle number over size, particle surface over size, particle mass over size
  • additional information of particle number, particle surface, and dust mass distribution
  • 31 equidistant size channels, PSL traceable
  • integrated 47 mm PTFE filter (GRIMM dual technology)
  • versatile data acquisition and communication interfaces (Bluetooth, USB, Ethernet, RS-232)
  • rinsing air for protecting laser and detector in optical cell
  • internal sensor for temperature (T) and relative humidity (RH) in optical cell
  • total inlet flow (1.2 L/min) analyzed in optical cell
  • self-test of all optical and pneumatic components for highest quality standards


  • aerosol science
  • PM2.5 in indoor environments according to VDI 4300, part 11
  • Indoor Air Quality (IAQ) in buliding and vehicles process control in industry
  • workplace monitoring (inhalable, thoracic, respirable) according to EN 481
  • monitoring of Permissible Exposure Limit (PEL) with high time resolution
  • dust pollution measurements

Technical Data

measurement range

dust fractions (EN 481) inhalable, thoracic, respirable Enviro algorithm: TSP, PM10, PM4, PM2.5, PM1, PMcoarse | IAQ algorithm pm10, pm2.5 pm1
number concentration and size distribution

particle size range

0.253 - 35.15 μm

size channels

31 in total, equidistant

particle number

0 - 5 300 000 particles/liter, diluter available for higher concentrations

dust mass

0 μg/m3 - 100 mg/m3


>97% for total measuring range, according to ISO 21501-1

particle detection principle

light scattering at single particles with diode laser; detection volume aerodynamically focused, no border zone error


fast signal processing, 2 x 16 raw data channels

time resolution

6 s, 31 channels (selectable storage intervals 6 s, 1, 5, 10, 15, 30, 60 min) 1 s, 16 size channels (0.253 μm < Dp <2.982 μm < Dp < 35.15 μm)

volume flow rate

1.2 L/min, ± 3% constant due to self-regulation, according to ISO 21501-1; automatic altitude correction

rinsing air

0.4 L/min, protection for laser optics, reference air for self-test

gravimetric control

47 mm PTFE filter


keypad or PC with GRIMM software (wireless or data cable)


Bluetooth, USB, Ethernet, RS-232, SD card

analog input

1 port (0 - 10 V) for external sensors

power supply

in: 100 - 240 VAC, 47 - 60 Hz, out: 12 VDC, 2.5 A

power consumption

5.4 W


intelligent Li-lon-battery, 10.8 V, 6.8 Ah for minimum 8 h operation with desktop smart quick charger


27 x 13 x 7 cm / 10.5 x 4.8 x 2.6 inches (L x W x H)


2.1 kg / 4.6 lbs

operating conditions

+4 to +40°C (39 - 104°F), RH < 95%, non-condensing, non-corrosive, or explosive gases

storage and transport

-20 to +50°C (-4 - 122°F), RH<95%



advanced GRIMM software for 11-D


Hard-sided carrying case with foam inserts


GPS sensor


isokinetic sampling probe for 4 - 25 m/s


external sensor for temperature and relative humidity

1159-10, 1159-100

capillary diluter (1:10 or 1:100)




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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