Manual
Combined Wind Sensor ARCO-Modbus
(14581) ARCO-Modbus
Manual
at the same measuring point, with any mutual interference of
the sensors being avoided. The sensor ARCO-Modbus meets
this requirement.
The sensor must not be installed on to, or close
to, transmitting plants or antennas. A minimum
distance of 2 m is to be kept for interference-free
signal transfer.
2.2
Tools and installation aids
There are no special tools or materials required for installation
or maintenance. All work can be carried out with standard tools
available in a regular workshop.
2.3
Unpacking the sensor
The sensor is packed in a separate box, carefully protected
against mechanical infl uences, in order to avoid damage dur-
ing transport. When securely installed, the sensor can with-
stand shock and vibration, which normally occurs on ships.
Please verify that the following parts and documents are
enclosed:
· 1 sensor ARCO-Modbus
· 1 manual
Accessories: (dependant on order size, always separately
packed)
2.4
Goods inspection
Please thoroughly check the delivery with regard to complete-
ness and eventual transport damages. In case of eventual
claims please contact us in writing immediately.
2.5
Power supply
The sensor requires at the input connector a 24 volt nominal
DC power source for operation. The sensor heating has a
power consumption of 2·9 W.
1
Introduction
The sensors of the ARCO family are very robust, compact and
extremely reliable. When developing these sensors particular
consideration has been given to the fulfi lment of meteorologi-
cal requirements.
The system acquires the horizontal air fl ow and processes the
measuring data to the meteorological parameters wind speed
and wind direction.
The sensors and further system components are mounted in
a splash water resistent and dustproof metal housing.
The measured data are output via a galvanically isolated
RS 485 interface via Modbus RTU after switching on the
supply voltage.
Due to their shock and vibration proof construction the sensors
ARCO-Modbus are particularly qualifi ed for use under severe
environmental conditions. The housing and the measuring
elements are made of seawater resistant aluminium alloys.
The housing, the cup rotor and the wind vane are anodised.
An electronically controlled sensor heating device allows for
operation of the sensor over the wide range of -30...70 °C.
2
Start-up
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, the values are only
valid for the site where the measuring instrument is installed.
We therefore recommend selecting the place of installation
very carefully.
2.1
Installation conditions
For professional wind measurements the location and height
of the wind sensor are important for accurate, correct results
and representative wind conditions. Ideally, the sensor should
be installed 10 m above the ground on a mast. There should
also be nothing aff ecting wind fl ow within a radius of 150 m
around the sensor. This may be buildings, trees, tall towers,
lifting cranes, moving vehicles, aircrafts, helicopters or other
obstructions. In the case of mobile measurements on vehicles
often the above mentioned conditions are not practicable.
Then you have to fi nd compromises.
Generally, wind measuring instruments should not measure
the specifi c wind conditions of a limited area, but indicate the
typical wind conditions of a wider area. The values measured
at diff erent places must be comparable. Thus, when installing
the sensor you should make sure the place of installation is
not under the lee of great obstacles. The distance between
the obstacles and the sensor should be 10 times the height
of the obstacles (this corresponds to the defi nition of an un-
disturbed terrain).
If an undisturbed terrain of this kind does not exist, the sensor
must be put up at a height of at least 5 m above the obstacle
height.
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. If you want to measure both wind direction
and wind speed, if possible, the sensors should be mounted
2
