Manual
Weather Sensor u[sonic]WS7 Modbus
(16480) u[sonic]WS7 Modbus
Manual
1
Introduction
The sensors of the u[sonic] family are very robust, compact,
and extremely reliable. The sensors embody the experience
of more than 150 years of development and production of
LAMBRECHT wind sensors.
The system acquires the horizontal air flow and processes the
measuring data to the meteorological parameters wind speed
and wind direction. Furthermore the weather-module of the
u[sonic]WS7 Modbus acquires the meteorological parameters
air temperature, relative humidity, barometric pressure and
global radiation. Based on the measured data u[sonic]WS7
Modbus calculates the dew point temperature and provides
for its serial output along with the measuring data.
The sensors and further system components are mounted in
a splash water- and dust proof metal housing.
The measuring data are automatically transmitted via se-
rial interface RS-485 in talker mode, when power supply is
switched on.
Due to their shock- and vibration proof construction the sensor
u[sonic]WS7 Modbus is particularly qualified for use under
severe environmental conditions. The housing is made of
anodized seawater resistant aluminium.
An electronically controlled heating device enables the sen-
sor to operate in between the wide range of -40 up to 70 °C.
1.1
Warranty
Please note the loss of warranty and non-liability by un-
authorized manipulation of the system. You need a written
permission of the LAMBRECHT meteo GmbH for changes
of system components. These activities must be operated
by a qualified technician.
The warranty does not cover:
1. Mechanical damages caused by external impacts (e. g.
icefall, rockfall, vandalism).
2. Impacts or damages caused by over-voltages or elec-
tromagnetic fields which are beyond the standards and
specifications in the technical data.
3. Damages caused by improper handling, e. g. by wrong
tools, incorrect installation, incorrect electrical installation
(false polarity) etc.
4. Damages which are caused by using the device beyond
the specified operation conditions.
Static measuring principle for wind measurements means:
• Determination of data works without moving measuring
elements, i.e. none abrasion, least maintenance and none
recalibration because of this method.
• The wind parameter can be measured also in winter time
accurate and precise, because of the electronic controlled
heating for the immovable measuring elements. This
heating is particularly effective against ice and snow in all
climatic zones.
• The measuring principle allows very low starting values
and high repeat accuracy.
• The sensor rapidly can be installed. Due to the special
measuring principle minor changes from the angle of pitch
can be disregarded.
Advantages of the sensor:
• Apart from the sensors for wind speed and direction the
compact housing also contains built-in sensors for air
temperature, relative humidity, barometric pressure and
global radiation.
• The built-in test function of the station, enabled by the
tight integration of the meteorological sensors into the
enclosure, can perform cyclic self-testing and notify the
user of erroneous data or failure.
• The compact design of this sensor with 7 meteorological
parameters is eliminating the traditional cabling and instal-
lation work significantly. Distribution boxes, power supply
units and other accessories can be reduced to a minimum
expense.
2
Setting to work
Wind can be represented by a vector quantity. For a complete
description of the wind it is necessary to specify its speed
and direction. The two components are subject to spatial and
temporal variations; thus, strictly speaking, they are valid only
for the site where the measuring instrument is installed. We
therefore recommend selecting the place of installation very
carefully.
2.1
Installation conditions
2.1.1 Generally
For professional wind measurements according to meteoro-
logical standards (e. g. VDI 3786, Part 2) location and height
of the wind sensor are important for representative and ac-
curate results. Generally, wind measuring instruments should
not measure the specific wind conditions of a limited area,
but indicate the typical wind conditions of a wider area. To
obtain results which are representative for a wider area and
comparable to values measured at different places, the sen
-
sor must not be mounted under the lee of higher obstacles.
The distance to any obstacle should be at least 10 times the
obstacle‘s height (corresponding to the definition of an undis
-
turbed area). In general a measuring height of 10 m above
ground is regarded ideal.
If an undisturbed terrain of this kind does not exist the sen-
sor have to be put up at an height of at least 6 m above the
obstacle height.
If the above mentioned requirements are not feasible e. g. on
mobile measurements at vehicles or at measuring containers
compromises have to be found and documented.
If the sensor must be installed on a roof top the place of instal-
lation must be in the middle of the roof to avoid predominant
wind directions.
3