combined Speed-Direction Anemometer

In the framework of Ev-K2-CNR / SHARE (Stations at High Altitude for Research on the Environment) project the first permanent Automatic Weather Station (AWS) has been installed in Uganda, on July 18, 2006 in the western part of the Stanley Plateau, the biggest Rwenzori glacial mass. The Project was carried out during the celebration of Mt. Ruwenzori first ascent by Duke of Abruzzi in 1906 . This station has the same technical characteristics of the Ev-K2- CNR networks located in the high altitude regions of Himalaya and Karakorum. The station records continuously measurements of the seven meteorological standard parameters: air temperature, relative humidity, wind speed and direction, atmospheric pressure, global solar radiation and total precipitation. The Rwenzori observations will permit to study physical and dynamical processes at Africa high elevations in the framework of SHARE and GEWEX-CEOP HE programs to improve our understanding of variability and change in hydrological and energy cycles and their role in the climate system.
 
Citation proposal
(2011) . combined Speed-Direction Anemometer. https://geoportal.mountaingenius.org/geonetwork/srv/api/records/5a57ede3-a935-43e2-a4ef-37d567691566
 

Simple

Date ( Publication )
2011-03-30T17:51:00
Purpose
The AWS includes the transducers for measuring wind speed and direction. The CombiSD DNA022 Lsi-Lastem sensor includes, in a single apparatus, the transducers for measuring wind speed and direction. Its use simplifies the installation and the plant design in respect of the systems with separate units plus giving some other advantages being smaller, lighter and cheaper.
Status
On going

  Point of contact

  +39 035 3230551 
Website
http://www.evk2cnr.org/  
Maintenance and update frequency
As needed
Keywords ( Theme )
  • NEXTDATA
Keywords ( Theme )
  • NEXTDATA
GEMET ( Theme )
  • thermal power plant
Keywords
  • SHARE , Network , Station , High Altitude
Keywords ( Theme )
  • AWS
Keywords ( Place )
  • Rwenzori Range , Uganda , Elena Glacier
Keywords ( Theme )
  • wind speed , wind direction
Keywords ( Theme )
  • NEXTDATA
GEMET ( Theme )
  • thermal power plant
Keywords
  • SHARE , Network , Station , High Altitude
Keywords ( Theme )
  • AWS
Keywords ( Place )
  • Rwenzori Range , Uganda , Elena Glacier
Keywords ( Theme )
  • wind speed , wind direction
Keywords ( Theme )
  • NEXTDATA
GEMET ( Theme )
  • thermal power plant
Keywords
  • SHARE , Network , Station , High Altitude
Keywords ( Theme )
  • AWS
Keywords ( Place )
  • Rwenzori Range , Uganda , Elena Glacier
Keywords ( Theme )
  • wind speed , wind direction
Use limitation
No conditions apply
Access constraints
Copyright
Other constraints
Metadata language
eng
Character set
UTF8
Topic category
  • Climatology, meteorology, atmosphere
  • Environment
  • Geoscientific information
N
S
E
W


Supplemental Information
Reference system identifier
EPSG / WGS 84 (EPSG:4326) / 7.4
Topology level
Geometry only
Geometric object type
Point
Geometric object count
13
OnLine resource
SHARE Geonetwork portal  

SHARE Geonetwork portal

OnLine resource
dna022.pdf  

CombiSD combined Speed-Direction Anemometer DNA022 Manual

OnLine resource
Chapter_5_Surface_wind.pdf  

Guide to Meteorological Instruments and Methods of Observation WMO-No.8-Chapter5:” Measurement of surface wind”

Hierarchy level
Series
Statement

The DNA022 Lsi-Lastem combined wind speed-direction sensor is mounted on a 5m pole on Rwenzori station in 2006.

The CombiSD sensor includes, in a single apparatus, the both transducers for measuring wind speed and wind direction. Its use simplifies the installation and the plant design in respect of the sensors with separate measurements plus giving some other advantages being smaller, lighter and cheaper. The CombiSD DNA022: sensor has a direct signal output. Frequency (Hz) for wind speed and resistance (Ohm) for wind direction. The CombiSD has low power consumption, it can be used in systems with small energy availability.

The technical characteristics are:

- Principle of operation: 3 cups and vane anemometer

- Speed sensor: Optoelectronic disk

- Direction sensor: 2000 Ohm wire potentiometer / Positioning Hall effect sensor

- Housing: Heavy gauge anodised aluminium

- Shaft carriers: Low-torque stainless steel bearings

- Protection (vertical position): IP65

- Mechanical mounting: On 48 50 mm diameter mast

- Electrical outlet terminators: IP65 watertight connector

- Weight (instrument with rotors): 950 gr.

The Physical and operational specification are:

- damage threshold > 75 m/s

- operating temperature: -30°+70°C

The speed measures are specified by:

- Measurement range: 0-60 m/s (using transfer function)

- Threshold: 0,21 m/s

- Response time (63% at 5 m/s): 0.8 s

- Distance constant (delay distance) at 5 m/s: 4 m

- Resolution (integration time=1s): 0.05 m/s

- Accuracy & Linearity: 0,1 m/s+1%VL (readout), if connected to LASTEM data loggers.

The direction measures are specified by:

- Measurement range: 0 ÷ 360

- Threshold: 0,15 m/s

- Response time (at 5 m/s): 0,26 s

- Delay distance (at 5 m/s): 1,32 m

- Damping coefficient (VDI3786): 0,21

- Transfer function: Dir(°)= 355 x R(Ohm)/2000

- Resolution: 0,1

- Accuracy: 1% FS (Full scale)

- Integral linearity: 0,5%

gmd:MD_Metadata

File identifier
5a57ede3-a935-43e2-a4ef-37d567691566   XML
Metadata language
eng
Character set
UTF8
Parent identifier
214ae251-8e1f-47f2-97bc-95c0ee8813aa
Hierarchy level
Series
Date stamp
2011-11-22T16:01:04
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0

  Point of contact

  +39 035 3230551 
Website
http://www.evk2cnr.org  
 
 

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