WSI, WSDI, WSS or WSS-L User’s Manual
DEIF A/S
Page 3 of 19
1. General information
IMPORTANT: In this document, the term WSS will represent both WSS and WSS-L if no specific
mentioning of the WSS-L is made.
Application
The wind measuring system WSS is a fast responding and accurate system designed for
measurement of wind speed and wind direction on-board ships. The wind measuring system
WSS is classified for residential, commercial and light industry plus industrial environment.
This system offers the advantage of reading the measuring results from several locations on-
board, e.g. at control desks both on the bridge and on the bridge wings.
The displays are provided with data output for serial transfer of measuring values to the
navigation computer of the ship via NMEA protocol.
The system indicates relative wind speed and wind direction. If indication of absolute wind speed
and wind direction is required, these values must be calculated separately.
Design
The wind measuring system type WSS consists of three components: A wind sensor, an
interface box and 1-3 displays for indication of wind speed and wind direction.
Anemometer sensor type WSS or WSS-L
The sensor is based on 3 ultrasonic transducers arranged in a triangle for measuring of wind
speed and wind direction. By measuring the time it takes the ultrasound to travel from one
transducer to the other two, the wind speed and the direction can be measured.
The wind sensor is available in two versions:
- The WSS with a built-in heater, which will automatically engage when risk of icing occurs
during low temperatures.
- The WSS-L without the heater is intended for applications in geographic areas where the
risk of icing is very low or where occasional dropouts caused by icing are acceptable.
WSS interface box type WSI
The interface box is connected between the sensor and the display. The interface box has to be
supplied from an 18…32V DC supply able to deliver 0.9A at 24V DC (1.25A at 18V DC), and it
will then supply the ultrasonic transducers and the built-in heating element and at the same time
convert the data signal for wind direction and wind speed into a TTL signal intended for the
WSDI display(s). This is to make it possible to replace an existing wind sensor type 879.3c with
our new sensor type WSS and to be able to connect the sensor to the existing display type
WSDI. Besides, the already mounted cable for the sensor can still be used.
Display type WSDI
The display(s) is (are) equipped with a digital display for read-out of wind speed plus a circle of
red LEDs for indication of wind direction. In addition, the display(s) also has (have) an output for
the NMEA communication.
By means of 3 push-buttons on the front panel the light intensity can be set to an adequate level,
and it is possible to choose between indication of wind speed in either m/s or KTS.
The light intensity may be set at 8 different levels. The two push-buttons "" and "" are used
to increase/decrease the light intensity. With each push on the "" button the light intensity is
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