Met One 034B Windset Revision: 1/11 N C o p y r i g h t © 1 9 8 0 - 2 0 1 1 C a m p b e l l S c i e n t i f i c , I n c .
Warranty and Assistance The MET ONE 034B WINDSET 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.
Met One 034B 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....................................................................2 3.1 Siting................................................................
Met One 034B Table of Contents Figures 3-1. 034B Mounted on a Crossarm Using a 17953 NU-RAIL Crossover Fitting .................................................................................................. 3 3-2. CM200 Series Crossarm with CM220 Right Angle Mounting Bracket..... 4 A-1. Magnetic Declination for the Contiguous United States ................... A-2 A-2. Declination Angles East of True North are Subtracted From 0 to Get True North ...........................................................
Met One 034B Windset 1. General The 034B Windset is used to measure horizontal wind speed and direction. Wind speed is measured with a three cup anemometer. Rotation of the cup wheel opens and closes a reed switch at a rate proportional to wind speed. Vane position is transmitted by a 10K ohm potentiometer. With a precision excitation voltage applied, the output voltage is proportional to wind direction.
Met One 034B Windset Wind Direction Measurement Range: 0 to 360° Threshold: 0.4 m s-1 (0.9 mph) Accuracy: ±4° Resolution: 0.5° Potentiometer Resistance: 0 to 10 kΩ open at crossover General Specifications Operating Temperature Range: -30° to +70°C Weight: 907 g (2.0 lb.) NOTE The black outer jacket of the cable is Santoprene® rubber. This compound was chosen for its resistance to temperature extremes, moisture, and UV degradation. However, this jacket will support combustion in air.
Met One 034B Windset CAUTION The set screw holes must be covered with the labels to prevent corrosion and assure the warranty. Mount the CM200-series crossarm to the tripod or tower. Orient the crossarm North-South, with the 1” NU-RAIL or CM220 on the North end. Remove the alignment screw at the base of the 034B (Figure 3-1). Insert the 034B into the aluminum bushing provided with the sensor. Align the hole in the bushing with that in the 034B base and replace the screw.
Met One 034B Windset CM220 CM200 Series Crossarm FIGURE 3-2. CM200 Series Crossarm with CM220 Right Angle Mounting Bracket Attach the sensor cable to the six pin male connector on the 034B. Make sure the connector is properly keyed. Finger tighten the knurled ring. Route the sensor cable along the underside of the crossarm to the tripod/tower, and to the instrument enclosure. Secure the cable to the crossarm and tripod/tower using cable ties. 4.
Met One 034B Windset The CR10X, CR23X, and dataloggers programmed with CRBasic can also measure wind speed on a control port. With this option the black wire is connected to the 5 V terminal. CONNECTOR PIN-OUT 3 4 2 6 5 1 PIN 1 - AZIMUTH SIGNAL PIN 2 - AZIMUTH REFERENCE PIN 3 - AZIMUTH EXCITATION PIN 4 - PULSE OUT PIN 5 - PULSE REFERENCE PIN 6 - SHIELD NOTE 034B-L Windsets purchased directly from Met One Instruments have a different configuration on the 6 pin connector.
Met One 034B Windset TABLE 5-1. Wind Speed Multiplier* Model 034B Meters/Second Miles/Hour M = 0.7989 M = 1.787 Off = 0.28 Off = 0.63 *When configured to output counts, the multiplier above is divided by the execution interval in seconds. 5.2 Wind Direction The CR200(X) dataloggers use the ExDelSE instruction to measure wind direction. All other CRBasic dataloggers (e.g., CR800, CR1000, CR3000, CR5000) use the BRHalf instruction (see Section 5.4.1 for example).
Met One 034B Windset 5.4 Example Programs The following programs measure the 034B every 5 seconds, and store mean wind speed, unit vector mean direction, and standard deviation of the direction every 60 minutes. Wiring for the examples is given in Table 5-3. TABLE 5-3. Wiring for Example Programs Color Description CR1000 CR10X Red Wind Spd. Signal P1 P1 Black Wind Spd. Reference Green Wind Dir. Signal SE 1 SE 1 Blue Wind Dir. Excitation EX 1 E1 White Wind Dir.
Met One 034B Windset 5.4.2 CR10X Example Program ;{CR10X} *Table 1 Program 01: 5.0000 Execution Interval (seconds) 1: Pulse (P3) 1: 1 2: 1 3: 22 4: 3 5: 0.799 6: 0.2811 Reps Pulse Channel 1 Switch Closure, Output Hz Loc [ WS_ms ] Multiplier Offset 2: If (X<=>F) (P89) 1: 3 X Loc [ WS_ms 2: 1 = 3: 0.
Met One 034B Windset 10: Set Active Storage Area (P80) 1: 1 Final Storage Area 1 2: 101 Array ID 11: Real Time (P77) 1: 1220 Year,Day,Hour/Minute (midnight = 2400) 12: Wind Vector (P69) 1: 1 Reps 2: 0 Samples per Sub-Interval 3: 0 S, theta(1), sigma(theta(1)) with polar sensor 4: 3 Wind Speed/East Loc [ WS_ms ] 5: 4 Wind Direction/North Loc [ WindDir ] 5.
Met One 034B Windset 5.5.1 Sample CR10(X) Program when Long Leads are Required ;{CR10X} ; *Table 1 Program 01: 10 Execution Interval (seconds) 01: Pulse (P3) 1: 1 2: 2* 3: 22 4: 1* 5: 0.7990 6: 0.2811 Reps Pulse Channel 2 Switch Closure, Output Hz Loc [ WndS_m_s ] Mult Offset ;Set the wind speed to zero if the wind is not blowing. ; 02: If (X<=>F) (P89) 1: 1* X Loc [ WndS_m_s ] 2: 1 = 3: 0.
Met One 034B Windset 08: Wind Vector (P69) 1: 1 Reps 2: 0 Samples per Sub-Interval 3: 00 S, θu, & σ(θu) Polar*** 4: 1* Wind Speed [ WndS_m_s ] 5: 2* Wind Direction [ WndD_deg ] -Input Locations1 WndS_m_s 2 WndD_deg * Proper entries will vary with program and datalogger channel and input location assignments. ** On the 21X use the 5000 mV input range and the a 5000 mV excitation voltage. *** Average wind speed, average unit vector wind direction, standard deviation of unit vector wind direction 6.
Met One 034B Windset Symptom: Incorrect wind direction 1. Verify that the Excitation voltage, Range code, multiplier and offset parameters are correct for the datalogger type. 2. Check orientation of sensor as described in Section 3. 7.2 Wind Speed Symptom: No wind speed 1. Check that the sensor is wired to the Pulse channel specified by the Pulse count instruction. 2. Disconnect the sensor from the datalogger and use an ohm meter to check the reed switch.
Appendix A. Wind Direction Sensor Orientation A.1 Determining True North and Sensor Orientation Orientation of the wind direction sensor is done after the datalogger has been programmed, and the location of True North has been determined. True North is usually found by reading a magnetic compass and applying the correction for magnetic declination; where magnetic declination is the number of degrees between True North and Magnetic North.
Appendix A. Wind Direction Sensor Orientation Subtract declination from 360° Add declination to 0° 20 W 22 E 18 W 16 W 20 E 14 W 12 W 18 E 10 W 8 W 16 E 6 W 4 W 14 E 2 W 0 12 E 10 E 8 E 6 E 4 E 2 E FIGURE A-1. Magnetic Declination for the Contiguous United States FIGURE A-2.
Appendix A. Wind Direction Sensor Orientation FIGURE A-3.
Appendix A.
Appendix B. Wind Direction Measurement Theory It is not necessary to understand the concepts in this section for the general operation of the 034B Windset with Campbell Scientific’s datalogger. The 034B Windsets purchased from Campbell Scientific have a 9.53 kΩ fixed resistor and a variable resistor on the excitation line. The variable resistor is adjusted by the manufacturer so its resistance plus the 9.53 k resistor equals the resistance of the potentiometer (Rf = Rs + Rt). R = 9.
Appendix B.
Appendix C. Met One Instruments’ 034B Operation Manual This appendix contains a copy of Met One Instruments’ 034B Operation Manual. Campbell Scientific cannot guarantee that the information contained in their manual is current. For the latest information, please refer to Met One Instruments’ website (www.metone.com).
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Appendix C.
Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com • info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za • cleroux@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA) PO Box 444 Thuringowa Central QLD 4812 AUSTRALIA www.campbellsci.com.au • info@campbellsci.com.au Campbell Scientific do Brazil Ltda.
