Met One Instruments 020D Manuale utente
MODEL 020D
WIND DIRECTION SENSOR
OPERATION MANUAL
Document No 020D-9800
Met One Instruments, Inc
Corporate Sales & Service: 1600 NW Washington Blvd. Grants Pass, OR 97526
Tel (541) 471-7111 Fax (541) 471-7116
www.metone.com - [email protected]
020D-9800 REV A Page 1
Copyright Notice
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permission of Met One Instruments, Inc.
Technical Support
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contact a Technical Service representative during normal business hours;
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Voice: (541) 471-7111
Fax: (541) 471-7116
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Mail: Technical Services Department
Met One Instruments, Inc.
1600 NW Washington Blvd
Grants Pass, OR 97526
020D-9800 REV A Page 2
020D WIND DIRECTION SENSOR
OPERATION MANUAL
1.0 GENERAL INFORMATION
1.1 The Model 020D Wind Direction Sensor uses a lightweight, vane and a micro torque
potentiometer to produce an analog voltage output proportional to wind direction. An
internal heater reduces moisture for extended bearing life. The sensor mounts in a
crossarm assembly, such as the Met One Instruments’ Model 191-1.
1.2 The sensor cable has a quick-connect connector with vinyl-jacketed, shielded cable.
Cable length is given in-XX feet on each cable part number. A 1957-XX cable is
supplied for translators and data loggers having terminal strip connections. (Color
code, Figure 2-1).
020D-9800 REV A Page 3
Model 020D Wind Direction Sensor Specifications
Performance
Azimuth Electrical 0-356, Mechanical 0-360
Threshold 0.6 mph
Linearity ½% of full scale
Accuracy 3
Damping Ratio 0.4
Delay Distance Less than 3 feet
Temperature Range -50C to +85C
Electrical Characteristics
Input Power 9-18 VDC, 10 mA
Output* a. 0-5 volts for 0-360 (default setting)
b. 0-2.5 volts for 0-360 (user selectable)
Output Impedance 100 Ohms maximum
Maximum Cable Length 300 feet
Physical Characteristics
Weight 1.1 pounds
Finish Anodized Aluminum
Mounting Use with Crossarm Model 191 or equivalent
Cabling 1957-XX Cable (XX is cable length in feet)
Optional Accessories
A. External heater and power supply for extreme low temperature operation.
B. Aluminum vane assembly.
C. Model 040 Degree Wheel Calibrator.
D. Model 042 Telescopic Orientation Fixture.
020D-9800 REV A Page 4
2.0 INSTALLATION
2.1 Model 020D Wind direction Sensor Installation
A. Select output voltage range. Slide outer cover down to expose circuit board.
Connect the Yellow connector wire to J2-2 for 0-5v output, or J2-3 for 0-2.5v
output.
B. Check to see that the vane assembly rotates freely.
C. Makes sure that the vane assembly is properly balanced and that the balance
counterweight is tight. With the vane mounted, hold the sensor horizontal. Verify
balance.
D. Install the sensor in the crossarm with the keyed bushing. The orientation screw
in the stem of the wind direction sensor will fit through the hole in the mounting
bushing.
E. Connect the cable assembly to the keyed sensor receptacle and secure it to the
mounting arm using cable ties.
2.2 Model 020 Wind Direction Sensor Alignment
(Refer to Figure 2-1 “Typical 020D Installation”). The Orientation screw located on
the stem of the sensor is to be oriented so that it points south. Proceed as follows:
A. Tape the sensor hub and column together so that the notches on each part are
exactly aligned.
B. Loosen the two set screws in the alignment bushing so that the sensor and
bushing may be rotated.
C. Rotate the sensor so that vane (counterweight end) points directly south.
D. A transit located either directly south or directly north will facilitate the alignment
process; merely rotate sensor until vane and sensor column merge completely,
then tighten the set screws into the mounting bushing.
E. Optional alignment accessories are available:
1. A telescopic orientation device, which is inserted into alignment bushing
until alignment is achieved. Bushing is locked and orientation device is
removed and wind direction sensor installed.
2. A compass orientation device operates in similar manner, but is not
suitable for steel towers or poles.
020D-9800 REV A Page 5
2.3 Wiring
The cable assembly contains five wires. Typical wiring hookup is shown in Figure 2-1.
2.4 Lightning Protection
Weather sensors are sensitive to direct or nearby lightning strikes. A well-grounded
metal rod or frame should be placed above the sensor installation. In addition, the
shield on the signal cable (white/brown wire) must be connected to a good earth
ground at the translator end, and the cable route should not be vulnerable to
lightning.
020D-9800 REV A Page 6
3.0 OPERATIONAL CHECK-OUT
3.1 020D Wind Direction Sensor Check-Out (standard 360 operation)
A. With the sensor connected to the input, upon movement of the sensor’s vane in a
clockwise direction (as seen from above), the module’s output will move up-
scale. Movement of the module’s output will progress up-scale until the 360 (full
scale) mark has been reached; then output will drop to 0. When the notches on
the rotating hub and the column of the sensor are exactly aligned, the output
signal will correspond to 180.
3.2 020D Wind Direction Sensor Check-Out (with 540 conversion electronics)
A. With the sensor connected to the input, upon movement of the sensor’s vane in a
clockwise direction (as seen from above), the module’s output will move up-
scale. Movement of the module’s output will progress up-scale until the 540 (full
scale) mark has been reached, and then the output will drop to 180. Continued
clockwise rotation will again bring the module’s output up-scale to 540 and the
action is repeated. When the notches on the rotating hub and the column of the
sensor are exactly aligned, the output signal will correspond to 180 (or 540 on
the expanded scale.
3.3 If the sensor heater is used, then check internal heater operation by sliding sensor
cover down and touching the housing behind the printed circuit board. The housing
should feet warmer than the adjoining metal parts. The sensor has a built-in heater
that is designed to provide a raise in the internal temperature, providing a small
positive pressure. This heater requires an external 12V (@ 350 ma) power supply.
020D-9800 REV A Page 7
4.0 MAINTENANCE AND TROUBLESHOOTING
4.1 General Maintenance Schedule
6-12 Month Intervals:
A. Inspect Sensor for proper operation per Section 3.1 or 3.2.
B. Calibration as required per Section 4.4.
12-24 Month Intervals:
A. Replacement of sensor bearings as per Section 4.5.
B. Replacement of potentiometer as per Section 4.6
Table 4-1
020D Wind Direction Sensor Troubleshooting
Symptom Probable Cause Solution Refer to
No wind direction
output
Loss of supply
voltage
Check +12V supply
and connecting
cables
Figure 2-1
Faulty circuit
amplifier (output
often will be steady
5.0V)
Replace 2840-2 PCB Section 4.8
Faulty potentiometer Replace
potentiometer
Section 4.6
No change in
wind direction
output below 2-5
mph
Bad bearings Replace bearings Section 4.5
020D-9800 REV A Page 8
4.2 020D Wind Direction Sensor: 6-12 Month Periodic Service (Refer to Assembly
Drawing)
A. At the crossarm assembly, disconnect the quick disconnect plug from the sensor
(leave the cable secured to the crossarm). Remove the sensor from the
crossarm assembly bushing. Leave the bushing secure in the fitting.
B. Loosen the set screw on the bottom edge of the vane hub. Support the rotating
hub of the sensor with one hand and pull the vane assembly free.
C. Visually inspect the wind vane assembly to ensure that the wind vane and
counterweight are securely attached to the wind vane rod, and that the set screw
in the top edge of the rotating hub holds the rod in place.
D. Slide the sensor cover down to expose the potentiometer assembly and signal
conditioning module.
E. Inspect the interior of the sensor for any signs of corrosion.
F. Inspect the potentiometer for loose wires, cracks, and corrosion.
G. Inspect the shaft coupler for proper position. Make sure that the marks on the
rotating hub and the column assembly are aligned, and that all special set screws
are tight.
H. Inspect the circuit board assembly for cracks and corrosion. See Section 4.6 B.
I. Rotate the sensor hub assembly to make sure that it turns freely, and that the
sensor bearings are not damaged.
J. Make sure that the potentiometer assembly is rigid in its holder.
K. Apply a small amount of silicone lubricant (Dow Corning DC-33 or equivalent) to
the sensor O-ring seals. Slide the cover up over the sensor and wipe off any
excess lubricant.
L. Support the rotating hub of the sensor with one hand and mount the wind vane
assembly on the hub. The wind vane assembly is keyed to fit the pin on the hub.
Tighten the set screw in the bottom edge of the vane hub.
M. A moisture vent is located on the base of the sensor. Make sure that this vent is
clear.
N. Reinstall sensor according to installation procedure (Section 2.1); verify proper
operation using procedures in Section 3.1 and 3.2.
020D-9800 REV A Page 9
4.3 020D Wind direction Sensor Maintenance (Refer to 020D drawing for assembly
information)
The following procedures require a relatively clean, dry work area, a source of 12
VDC power at approximately 20 mA, a Model 040 Degree Wheel, and a 4-1/2 digit or
better digital voltmeter.
4.4 020D Wind Sensor Calibration
Any time the bearing, shaft, hub or potentiometer is removed and replaced, the
alignment of the potentiometer must be reestablished. Perform the following steps
for calibration:
A. Connect the sensor to a 12-volt power supply:
Pin A +12V
Pin B Common
B. Connect a high impedance digital (4-1/2 digit or better, see above) voltmeter
between common and Pin C (signal output).
C. Slide the Model 040 Degree Wheel onto the column of the wind direction sensor.
Install the 040 Pointer Assembly onto the rotating hub. Tape sensor hub and
column together so that the notches on both parts are exactly aligned.
D. Slide the degree wheel up to the pointer, allowing clearance space, and rotate
the degree wheel until the pointer is at exactly 180 on the wheel. Tighten the
degree wheel to the column, checking to ensure that it does not interfere with the
rotation of the pointer.
E. Remove tape and rotate the pointer, then recheck the alignment of the two
notches with the 180 mark on the degree wheel. Readjust if necessary.
F. Loosen the set screws in the shaft coupler (#21).
G. Place the pointer at 180 and rotate the potentiometer shaft coupler so that an
output of 2.500 0.005V (1.250V with a 2.5V output range) is measured. Tighten
set screws in the drive coupler (#21) and recheck at 180. Readjust if necessary.
H. Reconnect digital voltmeter to Pin C of the sensor connector and rotate the
pointer to 180. The output reading should be 2.500V 40mV (1.25V 20mV with
2.5V output range).
I. Remove 040 Degree Wheel and pointer. This completes the alignment
procedure.
Indice
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