Met One 50.5 Operation Manual

Wind sensor

Hide thumbs

Table Of Contents

Table of Contents

Quick Links

Download this manual

1600 Washington Blvd.

Grants Pass, Oregon 97526

Telephone 541-471-7111

Met One

Facsimile 541-541-7116

Instruments

50.5-9800 Rev C.doc

MODEL 50.5

WIND SENSOR

OPERATION MANUAL

Document No. 50.5-9800

Regional Sales & Service

3206 Main St. Suite 106

Rowlett, Texas 75088

Telephone 972-412-4715

Facsimile 972-412-4716

Table of Contents

Need help?

Do you have a question about the 50.5 and is the answer not in the manual?

Questions and answers

Summary of Contents for Met One 50.5

Page 1 MODEL 50.5 WIND SENSOR OPERATION MANUAL Document No. 50.5-9800 1600 Washington Blvd. Regional Sales & Service Grants Pass, Oregon 97526 3206 Main St. Suite 106 Telephone 541-471-7111 Rowlett, Texas 75088 Met One Facsimile 541-541-7116 Telephone 972-412-4715 Instruments Facsimile 972-412-4716 50.5-9800 Rev C.doc...
Page 2: Technical Support
© Copyright 2002 Met One Instruments, Inc. All Rights Reserved Worldwide. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any other language in any form by any means without the express written permission of Met One Instruments, Inc. Technical Support Should you require support, please consult your printed documentation to resolve your problem.
Page 3: General Information
The 50.5 provides are variety of outputs to suit the connection requirements of the user. Standard outputs are voltage and RS-232. SDI-12 and RS422/485 outputs are configured at the factory.
Page 4 5 tower leg diameters from the tower leg. The boom should project into the direction, which provides the least distortion for the most important wind direction. For example, a boom mounted to the east of the tower will provide least distortion for north or south winds. 50.5-9800 Rev C Page 4...
Page 5 2.4 ORIENTATION WITH FIXTURE The Orientation Fixture, Model 70.5, is used for very accurate positioning of the 50.5 sensor with respect to a benchmark or other object that can be visually observed. If a compass is used to establish a benchmark, the reading should be taken away from heavy metal objects, which can affect the reading and should be corrected for declination of the magnetic north pole.
Page 6 This is for 24 volts AC operation of the heaters. Heater power can be supplied from a power transformer or a Met One Instruments supplied power unit in a weatherproof box. The proportional controlled heater uses maximum current at start-up and power requirement goes down as the sensor/heater reaches stability.
Page 7 Figure 2-3 50.5 Wind Sensor Components 50.5-9800 Rev C Page 7...
Page 8 Figure 2-4 Alignment of Sensor to True North 50.5-9800 Rev C Page 8...
Page 9 Actual wiring will depend upon the version of the sensor to determine which of the three connections drawings apply. Warning: If you are connecting this 50.5 to an older 3155-cable assembly and are using the black wire as signal common, disconnect it because it will short out the RS-232 transmitter. No damage will occur to the circuit but the 50.5 current consumption will increase by 20 mA.
Page 10 +sss.s+ddd <cr><lf>. The same values for sss.s and ddd as the RS-232 format are output. The SDI-12 handshake is per the SDI-12 specifications and format. In this configuration, the RS-232 output or analog output is no longer available from the sensor. 50.5-9800 Rev C Page 10...
Page 11: Wind Direction
3. OPERATIONAL CHECK-OUT AND CALIBRATION 3.1. GENERAL The operation of the 50.5 is essentially automatic, and no specific sensor calibration is required for normal operation. The sensor has been calibrated at the factory prior to shipment. 3.2. RECORDING ELECTRONICS, SPAN The sensor is matched to the recording electronics by applying the sensor calibration constants.
Page 12: Quick Check
~100 m/s 1.25 3.00 4.42 ± 0.1 Wind Direction Blocked Axis Serial Data 0 — 1 V 0 — 2.5 V 0 — 5V North—South 180 Degrees 0.50 1.25 2.50 East—West 90 Degrees 0.25 0.63 1.25 50.5-9800 Rev C Page 12...
Page 13: Maintenance And Troubleshooting
4. MAINTENANCE AND TROUBLESHOOTING The 50.5 Sensor is sealed and there are no replaceable parts contained within. The 50.5 does not require periodic calibration and there are no internal adjustments that can be made. 4.1. GENERAL MAINTENANCE SCHEDULE* 12-24 month intervals: The Model 50.5 Wind Sensor should be inspected periodically for physical damage to the...
Page 14: Theory Of Operation
427 µs. If the wind is opposing the sonic pulse, the transit time will be approximately 482 µs. If these two values are used in the previous equation, the resultant velocity from equation will be 20 m/s. 50.5-9800 Rev C Page 14...
Page 15: Specifications
6. SPECIFICATIONS Sonic Wind Sensor Model 50.5 Wind Speed Range 0 to 50 m/sec ± 0.15 m/sec ≤ 5 m/sec or ± 2% ≥ 5 m/sec Accuracy Resolution 0.1 m/sec Wind Direction Range 0 to 360° Accuracy ±3° Resolution 1°...
Page 16 50.5 Wind Sensor Outline Dimensions 50.5-9800 Rev C Page 16...
Page 17: Wind Direction Sensor Orientation
0 degrees to get True North as shown in figure #3. For example, the declination for Grants Pass, Oregon is 17° East. True North is 360° -17°, or 343° as read on a compass. 50.5-9800 Rev C Page 17...
Page 18 : 42/25 N Longitude : 123/20 W Elevation : 1000 Units (m/km/ft) : ft FIGURE 3 Decl i n ati o n Angl e s West of True North Are Added to 0 to Get True North 50.5-9800 Rev C Page 18...
Page 19 This would indicate a declination of 15 degrees West-showing MN (magnetic North) to True North (Star). Other sources such as the local airport can be helpful in determining the correct declination. 50.5-9800 Rev C Page 19...
Page 20 APPENDIX B. WIND SENSOR MOUNTING OPTIONS TYPICAL VERTICAL MOUNTING WITH 191-6 CROSS ARM 073B SHIELD TOP OF TOWER TOWER TYPICAL HORIZONTAL MOUNTING 193 MOUNTING BOOM APPENDIX C. 50.5-9800 Rev C Page 20...
Page 21 HEATER CONFIGURATION AND WIRING 50.5-9800 Rev C Page 21...
Page 22 Where ‘x’ is 0 to suppress parameter labels. MS—Maximum Full Scale Wind Speed Set the unit’s full-scale wind speed output for full-scale analog output. Command: MSx.x<cr> Where ‘x.x’ is the full-scale speed in the units selected below. 50.5-9800 Rev C Page 22...
Page 23 However, increasing the number of samples will also increase unit accuracy. Command: SOx<cr> Where ‘x’ is the number of measurements averaged per sample cycle. The range of ‘x’ is 1 to 40. 50.5-9800 Rev C Page 23...
Page 24 SDI-12 Extended Commands The RS-232 command set can be accessed in the SDI-12 mode. Prefix the RS-232 command with the SDI address and an upper case X. Terminate the command with an exclamation point (no carriage return). 50.5-9800 Rev C Page 24...