Date ( Publication )

2011-03-30T17:51:00

Purpose

The purpose of this resource in Pyramid Laboratory Observatory station is to acquire data on:

- wind speed

- wind direction

Status

Completed

Maintenance and update frequency

As needed

GEMET ( Theme )

• thermal power plant

Keywords

• SHARE , Network , Station , High Altitude

Keywords ( Place )

• Nepal , Lobuche , Khumbu Valley , Sagarmatha National Park

Keywords ( Theme )

• AWS

Keywords ( Theme )

• wind speed , wind direction

Use limitation

No conditions apply

Access constraints

Copyright

Other constraints

Character set

UTF8

Topic category

• Climatology, meteorology, atmosphere
• Environment
• Geoscientific information

Supplemental Information

Reference system identifier

EPSG / WGS 84 (EPSG:4326) / 7.4

Topology level

Geometry only

Geometric object type

Point

Geometric object count

1

OnLine resource

Himalayas Reference Site Pyramid Station  

Himalayas Reference Site Pyramid Station

OnLine resource

https://geoportal.mountaingenius.org/portal/index.php/data/  

OnLine resource

https://geoportal.mountaingenius.org/geonetwork/srv/api/records/200472f4-fb23-4fa0-a6f8-85a47ff81ba1/attachments/Data%20Usage%20Policy.pdf  

Hierarchy level

Series

Other

Data: wind speed, wind direction

Statement

At the AWS Pyramid Laboratory Observatory station the CombiSD DNA022 Lsi-Lastem combined wind speed-direction sensor is mounted on a 5m pole.

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

200472f4-fb23-4fa0-a6f8-85a47ff81ba1   XML

Metadata language

eng

Character set

UTF8

Parent identifier

1802972c-49fa-4ddc-9622-4b50b858d7fd

Hierarchy level

Series

Date stamp

2025-02-07T16:30:02

Metadata standard name

ISO 19115:2003/19139

Metadata standard version

1.0