Chapter 2 ___________________________________________________________ Product Overview
VAISALA ________________________________________________________________________ 15
CHAPTER 2
PRODUCT OVERVIEW
Description and Purpose
FS11 is an intelligent visibility sensor for automatic weather-observing
systems. The visibility measurement is specially designed for Runway
Visual Range (RVR) applications but measures up to a Meteorological
Optical Range (MOR) of 75 km. If the detector is equipped with a
background luminance sensor, it can also measure ambient light.
The sensor can be employed as an observer’s aid in a semi-automatic
weather observing system. The sensor is also suitable for other weather
observing systems providing valuable information, for example, to
airport, road and harbor authorities.
The FS11 sensor requires a 115/230 VAC power supply and an RS-232
or an RS-485 cable or a single pair modem line for communication. The
instrument sends data and status messages to a remote display unit or a
data processing system.
A set of built-in commands and test routines is provided for the
configuration and monitoring of the multiple FS11 functions. During the
assembly and maintenance procedures, a display terminal is needed for
checking the system parameters and possibly for changing their values.
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