Young Heavy Duty Wind Monitor-HD Model 05108 - Manual (Page 2)

Page 1
05108-90(A)
MODEL 05108
WIND MONITOR-HD
INTRODUCTION
The reliability of the wind monitor sensor is well known. The
sensitive vane and propeller combination has proven effective for
countless applications in many disciplines.
The Wind Monitor-HD (Heavy Duty) model is designed to address
the most common concerns of mechanical wind speed and
direction sensors: bearing replacement. The HD utilizes extremely
long-wearing, oversize ceramic bearings to increase service life
of standard stainless steel bearings. In addition to being more
wear resistant, ceramic is resistant to corrosion in the most hostile
environments.
The Wind Monitor-HD also has an oversized propeller shaft , high
pitch propeller, and a locking propeller nut. The main housing,
nose cone, propeller, and other internal parts are injection molded
U.V. Stabilized plastic. Both the propeller and vertical shafts use
ceramic ball bearings. Bearings have light contacting teflon seals
and are filled with a low torque wide temperature range grease to
help exclude contamination and moisture.
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 azimuth 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 mounting post assembly and
orientation ring are secured to the mounting pipe by stainless steel
band clamps. A 3 meter (9.8 ft) pigtail cable assembly is supplied
for electrical connections. For longer cable lengths a user supplied
junction box or connector may be used. A variety of devices are
available for signal conditioning, display, and recording of wind
speed and direction.
INITIAL CHECKOUT
When the Wind Monitor-HD is unpacked it should be checked
carefully for any signs of shipping damage. Remove the nut on
the propeller shaft. Install the propeller on the shaft so the letter
markings on the propeller face forward (into the wind). Engage the
propeller into the molded ribs on the propeller shaft hub. The nut
should be fully tightened with supplied wrench. 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°
dead band 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. Avoid a short circuit between
the azimuth 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.
WIND SPEED SPECIFICATION SUMMARY :
Range 0 to 100 m/s (224 mph)
Sensor 18 cm diameter 4-blade helicoid propeller
Pitch 50.0 cm air passage per revolution
Distance Constant 2.7 m (8.9 ft.) for 63% recovery
Threshold Sensitivity 1.0 m/s (2.2 mph)
Transducer
Centrally mounted stationary coil,
2K 0hm 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
(0.166 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 0.25
Delay Distance 1.3 m (4.3 ft) for 50% recovery
Threshold Sensitivity 1.0 m/s (2.2 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 potentiometer, 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 Temp: -50 to 50°C (-58 to 122°F)