Fog Monitor (FM-120)

Advantage Characteristics

Technical Parameter

Application Scope

Classic Cases

Advantage Characteristics

Depend on automatic correction for drifts in polarization signals through the dynamic thresholding feature. Sampling frequency, resolution and filing interval can be set as required 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.

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. Access raw data for one particle in each sampling instance. Use this information as an important instrument diagnostic.

Technical Parameter

Measured Parameters Single-particle forward light scattering
Derived Parameters Particle diameter Particle number concentration Liquid water content (LWC) Effective diameter (ED) Median volume diameter (MVD)
Auxiliary Parameters Temperature Pressure
Particle Size Range Droplets with 2-50 µm diameter
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 3.5° ~ 12°
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)