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05103L-90(I)
MODEL 05103L
WIND MONITOR
with 4-20mA OUTPUTS
INTRODUCTION
The 05103L Wind Monitor measures wind speed and direction
and provides calibrated wind speed and direction signals via
independent loop-powered 4-20 mA analog transmitters. Sensor
housing, nose cone, propeller, and other components use molded
UV-stabilized plastic for strength, corrosion resistance, light weight,
and fast response. Both the propeller and vertical shafts use
stainless steel precision grade ball bearings.
The sensor mounts directly on standard one inch pipe, outside
diameter 34 mm (1.34"). An orientation ring allows sensor
removal without loss of wind direction reference. Both sensor and
orientation ring are secured to the mounting pipe by stainless steel
band clamps. Electrical connections are made in a junction box on
the mounting post.
INITIAL CHECK-OUT
Carefully unpack and check the Wind Monitor for any signs of
shipping damage. Remove the plastic nut on the propeller shaft.
Install the propeller on the shaft with the serial number of the
propeller facing forward (into the wind) and replace the nut.
Vane and propeller should easily rotate 360° without friction. Check
vane balance by holding the instrument mounting post so the vane
surface is horizontal. It should have near neutral torque. A slight
imbalance will not degrade performance.
Check operation with displays, data loggers, or other devices
before installation.
INSTALLATION
As a general rule, 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. To obtain
meaningful data for most applications, locate the instrument well
above or upwind from obstructions. For some applications it may
not be practical or necessary to meet these requirements.
CONNECT THE WIND MONITOR TO EARTH GROUND
AS SHOWN IN THE WIRING DIAGRAM TO AVOID
ERRONEOUS SIGNALS OR SENSOR DAMAGE.
Initial installation is most easily performed using two people; one
to adjust instrument position and the other to observe an indicating
device. After initial installation with the included orientation ring, the
instrument can be removed and returned to its mounting without
re-alignment. Install the Wind Monitor following these steps:
1. MOUNT WIND MONITOR
a) Place orientation ring on mounting post. Do Not tighten band
clamp yet. (Orientation ring may be omitted when portable
tripod is used.)
b) Place Wind Monitor on mounting post. Do Not tighten band
clamp yet.
2. CONNECT SENSOR CABLE.
a) Connect sensor cable according to wiring diagram located at
back of manual.
3. ALIGN VANE
a) Connect instrument to indicator.
b) Choose a known wind direction reference point on the
horizon.
c) Sighting down instrument center line, point nose cone at
reference point on horizon.
d) While holding vane in position, slowly turn base until indicator
shows proper value.
WIND SPEED SPECIFICATION SUMMARY
Range
0 to100 m/s (224 mph)
Sensor
18 cm diameter 4-blade helicoid
polypropylene propeller, 29.4 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 Ohm
nominal DC resistance
Output Signal
4 to 20 mA = 0 to 100 m/s
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 (2.4 mph) at 10° displacement
Damped Natural
Wavelength
7.4 m (24.3 ft)
Undamped Natural
Wavelength
7.2 m (23.6 ft)
Transducer
Conductive plastic potentiometer,
10K ohm resistance (±20%),
0.25% linearity, life expectancy 50 million
revolutions
Output Signal
4 to 20 mA = 0 to 360°
GENERAL
Power Requirement: 12 to 30 VDC, 20 mA per channel
Operating Temp:
-50 to 50°C (-58 to 122°F)
