Vaisala FD12 Technical data
Vaisala FD12 Visibility Meter
e FD12 forward-scatter visibility meter evaluates the
Meteorological Optical Range (MOR) by measuring the
scatter of infrared light in air. Typical applications of FD12 are
visibility measurement at airports and onboard ships, fog
detection and warning for highways, and meteorological
observations at remote locations.
FD12 consists of a transmitter, a receiver, and a controller. e
simplified mechanical design means minimum disturbance to
the sample volume of air. e compact construction and
factory set mountings ensure easy installation and eliminate
problems with start-up adjustments.
A minimum of maintenance is needed. All hardware from
electronic components to optics is field-proven. Anodized
aluminium surfaces together with a simple construction
make the instrument weather-proof. Depending on the environment, the cleaning of the lenses is necessary only a few
times per year; the device features automatic detection of
contamination and, consequently, alarm for the need of
cleaning.
An extensive set of self diagnostic routines monitors sensor
operation continuously. In case of a malfunction, an alarm is
immediately generated. e failure can be easily located by
enquiring the diagnostics about the sensor status.
e measurement range of FD12 is 10 to 50 000 metres. By
utilizing digital techniques in hardware design and signal
processing, the device exceeds the performance of other
forwardscatter instruments. Fast pulse rate used enables
precise recognition of weather conditions. e device has a
built-in visibility calculation compensation for snow, fog,
rain and sleet. e effects of stray light and severe weather
are eliminated resulting in accuracy under all circumstances.
In visibility sensor comparisons, FD12 has proved to
determine correct visibility data in weather conditions
ranging from clear to fog, to heavy rain and snow conditions.
• Measurement range 10 to 50 000 m
• Built-in compensation for different types
of precipitation
• Minimum of maintenance needed
• Correct visibility data in any weather
conditions
Features
P.O. Box 26, FI-00421 Helsinki, FINLAND
Tel: +358 9 89491, Fax: +358 9 8949 2485
E-mail: industrialsales@vaisala.com
www.vaisala.com
Measurement range
Measurement of MOR 10 ... 50 000 m (32...65,500 ft)
Instrument consistency
Variability between units ± 4 %
Outputs & power supply
Serial interfaces RS-232/485
Analog output 4 ... 20 mA current loop
Power supply 115/230 V ±20 %, 50/60 Hz
Power consumption 30 VA + 100 VA with defrosting heaters
Environmental
Operating humidity 0 ... 100 % RH
Operating temperature –40 ... +55 °C
Weight 35 kg with pole mast
20 kg with clamp mountings
Dimensions 210 cm (h) × 160 cm (w)
Options
Optional display unit Vaisala’s DD50 Digital Display
Optional modem 300 baud
Optional fixings Mast mounting clamps
Wall mounting clamps
Technical data
Ref. B210283EN-B
All specifications are subject to change without prior notice.
©Vaisala Oyj 2006
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