Young Heavy Duty Wind Monitor-HD-Alpine Model 05108-45 - Manual (Page 3)

Page 2
05108-45-90(A)
Before installation, connect the instrument to an indicator as shown
in the wiring diagram and check for proper wind speed and azimuth
values. Position the vane over a sheet of paper with 30° or 45°
cross markings to check vane alignment. 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.
INSTALLATION
Proper placement of the instrument is very important. Eddies from
trees, buildings, or other structures can greatly influence wind
speed and wind direction observations. To get meaningful data for
most applications locate the instrument well above or upwind from
obstructions. As a general rule, the air flow around a structure is
disturbed to twice the height of the structure upwind, six times the
height downwind, and up to twice the height of the structure above
ground. For some applications it may not be practical or necessary
to meet these requirements.
FAILURE TO PROPERLY GROUND THE WIND
MONITOR-HD ALPINE MAY RESULT IN ERRONEOUS
SIGNALS OR TRANSDUCER DAMAGE.
Grounding the Wind Monitor is vitally important. Without proper
grounding, static electrical charge can build up during certain
atmospheric conditions and discharge through the transducers.
This discharge can potentially cause erroneous signals or
transducer failure. To direct the discharge away from the
transducers, the mounting post assembly in which the transducers
are mounted is made with a special antistatic plastic. The Wind
Monitor should be mounted on a metal pipe which is connected to
earth ground. The mounting pipe should not be painted where the
Wind Monitor is mounted. Towers or masts set in concrete should
be connected to one or more grounding rods.
If it is difficult to ground the mounting post in this manner, the
following method should be used. The sensor cable shield wire
is internally connected to the antistatic mounting post. This shield
wire should be connected to an earth ground. (Refer to wiring
diagram)
Initial installation is most easily done with two people; one to adjust
the instrument position and the other to observe the indicating
device. After initial installation, the instrument can be removed
and returned to its mounting without realigning the vane since the
orientation ring preserves the wind direction reference. Install the
Wind Monitor-HD Alpine following these steps:
1. MOUNT WIND MONITOR-HD ALPINE
a) Place orientation ring on mounting post. Do Not tighten
band clamp yet.
b) Place Wind Monitor-HD Alpine on mounting post. Do Not
tighten band clamp yet.
2. CONNECT SENSOR CABLE
a) Route cable carefully to avoid strain.
b) Use of a waterproof connector or junction box is
recommended.
3. ALIGN VANE
a) Connect instrument to an indicator.
b) Choose a known wind direction reference point on the
horizon.
c) Sighting down instrument centerline, point nose cone
at reference point on horizon.
d) While holding vane in position, slowly turn base until
indicator shows proper value.
e) Tighten mounting post band clamp.
f) Engage orientation ring indexing pin in notch at instrument
base.
g) Tighten orientation ring band clamp.
CALIBRATION
The Wind Monitor-HD Alpine is fully calibrated before shipment and
should require no adjustments. Recalibration may be necessary
after some maintenance operations. Periodic calibration checks
are desirable and may be necessary where the instrument is used
in programs which require auditing of sensor performance.
Accurate wind direction calibration requires a Model 18112 Vane
Angle Bench Stand. Begin by connecting the instrument to a
signal conditioning circuit which has some method of indicating
azimuth value. This may be a display which shows azimuth values
in angular degrees or simply a voltmeter monitoring the output.
Orient the base with the junction box at 180°. Visually align the
vane with the crossmarkings and observe the indicator output. If
the vane position and indicator do not agree within 5°, adjust the
potentiometer coupling inside the main housing. Details for making
this adjustment appear in the MAINTENANCE, potentiometer
replacement outline, step 7. It is important to note that while full
scale azimuth on signal conditioning electronics may be 360°,
full scale azimuth signal from the instrument is 355°. The signal
conditioning electronics must be adjusted accordingly. For
example, in a circuit where 0 to 1.000 VDC represents 0° to 360°,
the output must be adjusted for 0.986 VDC when the instrument is
at 355°. (355°/360° X 1.000 volts = 0.986 volts)
Wind speed calibration is determined by propeller pitch and the
output characteristics of the transducer. Calibration formulas
showing wind speed vs. propeller rpm and output frequency are
included below. Standard accuracy is ± 0.3 m/s (0.6mph). For
greater accuracy, the device must be individually calibrated in
comparison with a wind speed standard. Contact the factory or
your supplier to schedule a NIST (National Institute of Standards &
Technology) traceable wind tunnel calibration in our factory.
To calibrate wind system electronics using a signal from the
instrument, temporarily remove the propeller and connect an
Anemometer Drive (18802 or equiv.) to the propeller shaft. Apply
the appropriate calibration formula to the calibrating motor rpm and
adjust the electronics for the proper value. For example, with the
propeller shaft turning at 3600 rpm adjust an indicator to display
30.0 meters per second (3600 rpm X 0.00833 m/s/rpm =30.0 m/s).
CALIBRATION FORMULAS
Model 05108-45 Wind Monitor-HD Alpine w / 08214-45 Propeller
WIND SPEED vs PROPELLER RPM
m/s = 0.00833 x rpm
knots = 0.01619 x rpm
mph = 0.01863 x rpm
km/h = 0.02999 x rpm
WIND SPEED vs OUTPUT FREQUENCY
m/s = 0.1666 x Hz
knots = 0.3238 x Hz
mph = 0.3726 x Hz
km/h = 0.5998 x Hz
MAINTENANCE
Given proper care, the Wind Monitor-HD Alpine should provide
years of service. The only components likely to need replacement
due to normal wear are the precision ball bearings and the wind
direction potentiometer. Only a qualified instrument technician
should perform the replacement. If service facilities are not
available, return the instrument to the company. Refer to the
drawings to become familiar with part names and locations. The
asterisk* which appears in the following outlines is a reminder that
maximum torque on all set screws is 80 oz-in.