Model 11-R
GRIMM AEROSOL TECHNIK GmbH & Co.KG Seite 38 von 83
3 Particle measuring with GRIMM dual technology
The Mini-LAS series dust monitors and aerosol spectrometers are compact portable measuring devices
constructed for the continuous measurement of dust in air. They are equipped with an integrated gra-
vimetry filter that collects all particles after the optical measurement, so they are available for further
tests. This dual technology is unique and patented by GRIMM Aerosol Technik.
The measurements can be output as a particle concentration in the unit of particles per litre or as a
mass concentration in the unit µg/m³. Various standardised dust mass fractions and the calculated par-
ticle surface can also be output with the GRIMM Windows 1178 software.
The sample air is suctioned through the measuring cell and into a gravimetry filter with the help of an
internal volume flow regulated pump. This filter serves as a dust collector and can be used for gravimet-
ric control of the optical measuring results. The pump also conveys purge air which is collected from the
pump exhaust air through an ultra-fine filter and kept constant by a purge air regulator. The purge air
protects the laser optics and other components of the optical measuring cell against dirt and serves as
particle-free reference air during the device self-test.
At the start of each measurement, the device performs a self-test. This takes approximately 30 seconds.
Then the actual measurement begins and the measurements are shown continuously on the display
every 6 seconds. Real time measurement of the dust concentration is therefore possible. All measure-
ments in an interval, which can be set in increments, are also transferred to an SD memory card if this
has been inserted into the dust monitor. The data can be transferred to an external computer or printer
via the integrated interfaces (RS-232, USB, Ethernet, Bluetooth). Data output can be set at intervals
from 6 seconds to 60 minutes.
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