HTabsOverviewThis optical spectrometer continuously samples droplet-laden ambient air and produces size distributions in the range from 2 µm to 50 µm. Key Features State-of-the-art technology Rely on the only all-weather ground-based instrument capable of measuring particle size distributions (PSDs) in the 2 µm to 50 µm size range – critical for understanding the evolution of fog, and useful for calculating number concentration, liquid water content, and extinction/visibility. Particle-by-particle (PBP) data Get high-resolution information on particle light-scattering intensity with the PBP optional feature. This allows much more precise and detailed size distributions, as well as minimization of the well-known Mie scattering ambiguities. Instrument diagnostics Access raw data for one particle in each sampling instance. Use this information as an important instrument diagnostic. Dynamic thresholding feature Depend on automatic correction for drifts in polarization signals through the dynamic thresholding feature. FM-120 Brochure.pdf SpecificationSpecification: Parameter Specification Measured Parameters Single-particle forward light scattering Auxiliary Parameters Temperature Pressure Derived Parameters Particle diameter Particle number concentration Liquid water content (LWC) Effective diameter (ED) Median volume diameter (MVD) Particle Size Range Droplets with 2-50 µm diameter Number of Size Bins 30 Typical Sample Area 0.24 mm² Sample Flow Volume 1 m3/min Sampling Frequency Standard Data Rate: Selectable, 0.04 sec to 20 sec PBP Data Rate: No limit until particles are coincident Refractive Index Non-absorbing, 1.33 (the industry standard for water) Light Collection Angles ~3.5º - 12º Data System Interface RS-422 serial interface up to 460 kB Environmental Operating Conditions Temperature: -40 to 40 °C Relative Humidity: 0 - 100%, non-condensing Altitude: 0 - 4,000 meters Weight 18.5 kg (instrument), 13.0 kg (pump & hose) Probe Dimensions 23 cm H x 28 cm W x 37 cm L Power Requirements Universal input for analyzer head, 50-60 Hz 115-120V or 230V for pump (set at factory, but user-configurable) 200W (instrument), 400W (pump) Further InfoDocuments: FM-120 Brochure.pdf
