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WindMaster Three Axis Anemometer

The new WindMaster three axis anemometer is a robust instrument based on time of flight measurements and is essential in the understanding of turbulent flows, surface energy balance and scalar fluxes. All these areas of research rely on accurate and precise measurements of mean and variance of (time averaged) wind velocities and Speed of Sound (SOS) derived temperature.This is particularly true in determining scalar fluxes using the eddy covariance technique. Gill employs the optimum mechanical configuration and electronic processing to minimise flow distortion and transducer shadow effects. Gill undertakes an individual calibration with a Gill wind tunnel test on each unit to provide the optimum performance. The WindMaster is available with a 20Hz data output rate with an option to increase this to 32Hz. The instrument is constructed in the familiar Aluminium/carbon fibre construction. The WindMaster is fitted with field proven standard Gill transducers with the ability to measure a top wind speed of 45 m/s. Both software and electronics have been enhanced to provide improved vertical (W) resolution and SOS accuracy. New design electronics has facilitated a reduction in power consumption to 55 mA at 12 V dc, a significant advantage when used on power sensitive sites. A number of orderable options are available including: -Increase in data output rate to 32 Hz• 4 analogue output channels with options for 12 or 14 bit resolution.• 4 analogue input channels, with options for 12 or 14 bit resolution.• A flange mounting arrangement is provided as standard, with option • to order a different mounting.Wind tunnel calibration in accordance with ISO 16622 and traceable • to national standards. Travelling case•

Key Features

Maintenance FreeLightweight Construction U, V, W, SOS & Sonic Temp Output 20Hz or Optional 32Hz Data Rate Optional Analogue Inputs and Outputs t pu t te

Specification

Range0 - 45 m/sResolution0.01 m/sAccuracy*<1.5% RMS @12 m/sAccuracy*<1% RMS @12 m/s (Custom) CommunicationRS232, 422, 485 network up to 26 anemometersBaud Rates2400 - 115200FormatASCII

Analogue Outputs - Optional

Range0 - 359º Resolution0.1º Accuracy2º @12 m/s Accuracy0.5º @12 m/s (Custom) Resolution 12 bits or 14 bits 4 channels available Selectable RangeUser selectable full scale wind speedOutput type0-20mA, 4-20mA, 0-5V, ±2.5V, ±5V

Analogue Inputs - Optional Sonic TemperatureMechanical

Resolution 12 bits or 14 bits Up to 4 single ended or 2 differential Input Type±5V Range-40ºC to +70ºCResolution0.01ºC

Power Requirement Wind SpeedDirectionDigital Output

Anemometer9-30V DC (25mA @ 12V DC)

Speed of Sound

Range300-370 m/sResolution0.01 m/s Accuracy

Environmental Measurement

Protection ClassIP65 Operating Temp-40ºC to +70ºC Humidity
*Accuracy spec applies for wind speed, and for wind incidence up to ±30º from the horizontal