Young Alpine Wind Monitor Ice-resistant Model 05103-45 - Manual (Page 2)

Page 1
05103-45-90(E)
INTRODUCTION
The Wind Monitor-Alpine model measures horizontal wind speed
and direction. It is rugged and corrosion resistant, yet accurate
and light weight. External housing surfaces are coated with a
special ice resistant coating to improve performance in harsh
alpine conditions. Both the propeller and vertical shafts use
stainless steel precision grade ball bearings.
Propeller rotation produces an AC sine wave signal with frequency
proportional to wind speed. This AC signal is induced in a
stationary coil by a six pole magnet mounted on the propeller
shaft. Three complete sine wave cycles are produced for each
propeller revolution.
Vane position is transmitted by a 10K ohm precision conductive
plastic potentiometer which requires a regulated excitation
voltage. With a constant voltage applied to the potentiometer,
the output signal is an analog voltage directly proportional to
wind direction angle.
The instrument mounts on standard one inch pipe, outside diameter
34 mm (1.34"). An orientation ring is provided so the instrument
can be removed for maintenance and reinstalled without loss of
wind direction reference. Both the mounting post assembly and
the orientation ring are secured to the mounting pipe by stainless
steel band clamps. Electrical connections are made in a junction
box at the base. A variety of devices are available for signal
conditioning, display, and recording of wind speed and direction.
INITIAL CHECKOUT
When the Wind Monitor is unpacked it should be checked carefully
for any signs of shipping damage.
Remove the plastic nut on the propeller shaft. Install the propeller
on the shaft so the serial number on the propeller faces forward
(into the wind). Engage the propeller into the molded ribs on the
propeller shaft hub. The instrument is aligned, balanced and fully
calibrated before shipment, however, it should be checked both
mechanically and electrically before installation. The vane and
propeller should easily rotate 360° without friction. Check vane
balance by holding the instrument base so the vane surface is
horizontal. It should have near neutral torque without any particular
tendency to rotate. A slight imbalance will not degrade performance.
The potentiometer requires a stable DC excitation voltage. Do
not exceed 15 volts. When the potentiometer wiper is in the 5°
deadband region, the output signal is "floating" and may show
varying or unpredictable values. To prevent false readings, signal
conditioning electronics should clamp the signal to excitation
or reference level when this occurs. NOTE: Young signal
conditioning devices clamp the signal to excitation level. Avoid
a short circuit between the wind direction signal line and either the
excitation or reference lines. Although there is a 1K ohm current
limiting resistor in series with the wiper for protection, damage
to the potentiometer may occur if a short circuit condition exists.
Before installation, connect the instrument to an indicator as shown
in the wiring diagram and check for proper wind speed and wind
direction values. To check wind speed, temporarily remove the
propeller and connect the shaft to an Anemometer Drive. Details
appear in the CALIBRATION section of this manual.
MODEL 05103-45
WIND MONITOR
WIND SPEED SPECIFICATION SUMMARY
Range 0 to 100 m/s (224 mph)
Sensor 14 cm diameter 4-blade helicoid propeller
molded of polypropylene
Pitch 29.4 cm air passage per revolution
Distance Constant 2.7 m (8.9 ft.) for 63% recovery
Threshold Sensitivity 1.1 m/s (2.4 mph)
Transducer Centrally mounted stationary coil, 2K Ohm
nominal DC resistance
Transducer Output AC sine wave signal induced by rotating
magnet on propeller shaft. 80 mV p-p at
100 rpm. 8.0 V p-p at 10,000 rpm.
Output Frequency 3 cycles per propeller revolution
(0.0980 m/s per Hz)
WIND DIRECTION (AZIMUTH) SPECIFICATION SUMMARY
Range 360° mechanical, 355° electrical (5° open)
Sensor Balanced vane, 38 cm (15 in) turning
radius.
Damping Ratio 0.3
Delay Distance 1.3 m (4.3 ft) for 50% recovery
Threshold Sensitivity 1.1 m/s (2.5 mph) at 10° displacement
Damped Natural
Wavelength 7.4 m (24.3 ft)
Undamped Natural
Wavelength 7.2 m (23.6 ft)
Transducer Precision conductive plastic potetiometer,
10K ohm resistance (±20%), 0.25%
linearity, life expectancy 50 million
revolutions, rated 1 watt at 40° C, 0 watts
at 125° C
Transducer Excitation
Requirement Regulated DC voltage, 15 VDC max
Transducer Output Analog DC voltage proportional to azimuth
angle with regulated excitation voltage
applied across potentiometer.
GENERAL
Operating Temperature: -50 to 50°C (-58 to 122°F)