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World’s Smallest Wide Range Aerosol Spectrometer
Mini-WRAS Model 1.371
A Symbiosis of an Optical Particle Counter and Electrical Mobility Spectrometer
Measuring from 0.01 to 35 µm with Wireless Operation

For many years GRIMM has been manufacturing different versions of aerosol spectrometers, which are
used frequently in the field. More often than before the question is:
Can the smallest particles be detected with these instruments? For the first time, this is now possible.
Two technologies were combined within the new Mini-WRAS (Mini Wide Range Aerosol Spectrometer):
(a) the optical aerosol spectrometer and (b) a stepping mode operated electrode with faraday cup
electrometer. Thus, the scattering light diameter of 0.25 to 35 micrometers and the diameter of the
electrical mobility from 10 to 200 nanometers can be combined in a wide size range. Over 40 size channels
are being measured every minute, ranging from 0.01 up to 35 micrometers and are released continuously.
With a total weight of only 8.2 kg, an integrated battery and advanced data communication interfaces
(Bluetooth, USB, and RS-232), this aerosol monitor is unique in the world.

Customer‘s benefits

Release of measurement data every minute as particle number in 41 equidistant size channels
Portable, compact and with integrated rechargeable battery and air drying
Distribution of count and mass or output according to occupational health standards EN 481
(inhalable, thoracic, alveolic) can be transferred via Bluetooth to our user-friendly software
Readout of PM10, PM2.5, and PM1 values is also possible with the same software
Does not need any kind of consumables (such as butanol)
Does not need a radioactive source
Sample air dryer for electrometer
For the user, the Mini-WRAS 1.371 offers the complete possibilities when saving or retrieving the
measurement data. The data can be conveniently accessed and checked online via Bluetooth or RS232 at the workplace per laptop or tablet. Additionally, the measurement data is stored on an USB
flash drive.
Data interfaces of the Mini-WRAS 1.371: USB, Bluetooth, RS-232