Coastal WEATHERPAK EOC Bedienings- en onderhoudshandleiding - Pagina 11

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2.4

Sensors

The system uses COTS (commercial off the shelf) sensors. A brief description of each sensor,

including sensor specifications, is provided in the following sections.

2.4.1

The wind sensor measures both horizontal wind speed and wind direction. The wind sensor is

mounted at the top of the WEATHERPAK

minimized. The wind sensor has an array of four equally spaced transducers in a horizontal plane

used to determine horizontal wind speed and direction. The measurement principle is based on

transit time, the time it takes for the ultrasound to travel from one transducer to another. Transit

time is affected by wind speed along the ultrasonic path. The transit time is measured in both

directions. For zero wind speeds, both the forward and reverse transit times are equal.

Operating Temperature Range

Measuring Range

Wind Speed Range

Wind Speed Accuracy

Wind Speed Resolution

Wind Direction Range

Wind Direction Accuracy

Wind Direction Resolution

2.4.2

The AT/RH sensor is housed inside the sealed WEATHERPAK

probe ranges from 0 to 1 VDC. Output voltages from the sensor are sent to the ZENO

WEATHERPAK

EOC for processing via an integral cable.

The radiation shield protects the sensor from incoming short wave solar radiation as well as

outgoing long wave radiation and provides excellent sensor contact with the incoming ambient air.

P/N: 0302-117-004 Rev. 0

EOC so that disturbance from ground objects is

Table 2-1 – Wind Sensor Specification Data

-55 °C to +70 °C

0 to 100 %RH

0-75 m/s (168 mph)

+2% @12 m/s (27 mph)

0.01 m/s

0-359°

2°

1°

WEATHERPAK

Operations & Maintenance Manual

EOC. The output voltage of the

EOC

in the