PDF《Met One 034A-LC Windset》

Met One 034A-LC Windset for MetData1 Revision: 5/07 C o p y r i g h t ?

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Warranty and Assistance The MET ONE 034A-LC WINDSET FOR METDATA1 is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'

s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'

s option) defective products. The customer shall assume all costs of removing, reinstalling, and shipping defective products to CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will return such products by surface carrier prepaid. This warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products which have been subjected to modification, misuse, neglect, accidents of nature, or shipping damage. This warranty is in lieu of all other warranties, expressed or implied, including warranties of merchantability or fitness for a particular purpose. CAMPBELL SCIENTIFIC, INC. is not liable for special, indirect, incidental, or consequential damages. Products may not be returned without prior authorization. The following contact information is for US and International customers residing in countries served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs for customers within their territories. Please visit www.campbellsci.com to determine which Campbell Scientific company serves your country. To obtain a Returned Materials Authorization (RMA), contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an applications engineer determines the nature of the problem, an RMA number will be issued. Please write this number clearly on the outside of the shipping container. CAMPBELL SCIENTIFIC'

s shipping address is: CAMPBELL SCIENTIFIC, INC. RMA#_____

815 West

1800 North Logan, Utah 84321-1784 CAMPBELL SCIENTIFIC, INC. does not accept collect calls. 034A-LC Table of Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat? bookmarks tab for links to specific sections. 1. General

1 2. Specifications

1 3. Installation.1 3.1 Siting.1 3.2 Mounting

2 4. Connection.2 5. Datalogger Programming.2 5.1 Program

3 6. Sensor Maintenance.4 7. Long Lead Lengths.5 7.1 Sample Program When Long Leads are Required.5 8. Wind Direction Measurement Theory

7 8.1 AC Half Bridge (P5)7 8.2 DC Half Bridge (P4)7 9. References

8 Figure 8-1. 034A Potentiometer in a Half Bridge Circuit.7 Tables 5-1. Multipliers and Offsets for Wind Speed and Direction.3 7-1. Multiplier and Offset for Wind Direction when using Lead Lengths Greater than

200 Feet.5 This is a blank page. Met One 034A-LC Windset for MetData1 1. General The Met One 034A Windset is an integrated cup anemometer and wind vane. The anemometer consists of three cups that sense the wind speed. These cups rotate on a vertical shaft that magnetically activates a sealed reed switch. The read switch opens and closes at a rate proportional to wind speed. The wind direction is sensed by a vane. The vane drives a

10 k? potentiometer. 2. Specifications Wind Speed Operating Range:

0 to

49 m s-1 (0 to

110 mph) Threshold: 0.4 m s-1 (0.9 mph) Accuracy: ±0.12 m s-1 (±0.25 mph) for wind speed <

10.1 m s-1 (22.7 mph) ±1.1% of reading for wind speeds >

10.1 m s-1 (22.7 mph) Output Signal: contact closure (reed switch) Wind Direction Range: