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Fotometro MIE-pDR-1200
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MIE PDR-1200 (Personal Data logging Real-time Aerosol Monitor) Thermo
Electron Corp., Franklin, MA, is a technologically advanced instrument
built to measure the concentration of particulate matter (liquid or
solid) in air, obtained by scattering of radiation infrared with a wavelength equal to 880nm, diffused by the particles themselves. The
amount of light is converted into a measure of concentration, using the
theory of diffusion of radiation calibration and production company,
performed using a fine powder for ISO testing (specific gravity,
2.5-2.6; MMD, 2-3 mm ).
The instrument uses an active sampling, or using a pneumatic pump that sucks the sample inside the instrument air. It
weighs about 0.5Kg and operates in a temperature range between -10 ° C
and 50 ° C, and a intervello relative humidity of 10% - 95%.
The
instrument is equipped with a cyclone (model GK2.05) that allows you to
select the particle depending on its size (PM10, PM2.5 or respirable
air), and also enables the user to separate the particles in the size
simply by varying the flow of air sucked in a range from 1 a10 l / min.
The
instrument covers a wide range of concentrations from 0.001 mg/m3 to
400 mg/m3, respectively, a situation very clean air up to a situation
of air is very polluted. The uncertainty associated with measures and by about 5% and can be made up to 1 measurement per second (1Hz).
The
PDR-1200 offers the possibility to select the specific dimensions of
the particulates to be analyzed by simply selecting the aerodynamic
diameter of cut, by varying the flow of air suction. For example, to obtain a dimension of size equal to 2.5 mm is necessary to have a flow of 4 l / min. The
photometer has a response time of the first order of 1 s and is also
used for the evaluation of vertical flow of PM2.5 with turbulent eddy
correlation technique. |
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