2031 Anemometer
Micro Response
Anemometer
Model 2031
User’s
Manual
11 6 5
National
Drive
•
Sacramento,
CA
95834
•
800.824.5873
Introduction
The Model 2031 Micro Response Anemometer is a highly
responsive three cup anemometer that uses a DC generator to
produce a DC voltage output proportional to wind speed.
· The threshold of the anemometer is I mile per hour.
· The entire anemometer assembly, with the exception of the
DC generator, is made from stainless steel, anodized aluminum, and carbon/graphite composite.
· A quick release waterproof connector is provided.
The Model 2031 Anemometer is often used is conjunction with
signal conditioning modules or data acquisition systems. Signal
conditioning modules provide an analog output proportional to
wind speed. Data acquisition systems can be directly coupled
to the Model 2031 to provide instantaneous as well as averaged
wind speed data.
Page iii
Contents
Installation...............................................................................................................................................1
Assembly ........................................................................................................................................................ 1
Site Selection .................................................................................................................................................. 1
Mounting ......................................................................................................................................................... 2
Orientation ...................................................................................................................................................... 2
Connection ...................................................................................................................................................... 2
Theory of Operation ................................................................................................................................3
Calibration...............................................................................................................................................4
Maintenance ...........................................................................................................................................5
Maintenance Kit .............................................................................................................................................. 6
Warranty .................................................................................................................................................7
Specifications..........................................................................................................................................8
Drawings .................................................................................................................................................9
Page v
Installation
This instrument is thoroughly tested and fully
calibrated at the factory and is ready for installation. Please refer to the return authorization card
included in the packing box if damage has occurred.
Also, notify All Weather, Inc.
Assembly
With the exception of installing the cup assembly,
the Model 2031 Micro Response Anemometer is
ready for mounting. Install the cup assembly as
described in the steps below.
Loosen the two No. 6 allen set screws and slide
the cup assembly over the anemometer shaft. Be
certain that the flat face of the shaft faces toward
the set screws.
The cup assembly hub should slide down over
the shaft and body and seat against the shaft ring.
When correctly in place, there should be about a
0.050 inch clearance between the skirt of the hub
and the shoulder of the body. Tighten both set
screws.
Spin the cup wheel by hand to assure smooth
operation. The cup wheel should coast to a smooth
stop.
Site Selection
Location of the sensor is critical for accurate wind
measurements. The standard exposure of an anemometer or vane over open, level terrain is 10
Distance to obstruction
h
5h
10h
20h
25h
30h
meters above the ground. Open, level terrain is
defined as level ground with no obstruction within
300 meters. In locations where obstructions are not
large, such as residential areas, and are distributed
more or less evenly, the sensor may be placed at
an effective height of h + 10 meters, where h is
the approximate height (in meters) of the various
obstacles. As an example, in a location where trees
and buildings reach to about 5 meters, the sensors
must be placed on a 15 meter mast to avoid erroneous results.
In areas where large obstructions do exist within
300 meters of the sensor, the following table can
be used to calculate the proper height of the sensor
(h is the height of the obstruction).
Example If there is a building 10 meters high
and 50 meters away, the anemometer should be at
least 16.7 meters above the ground. But, if the same
building is 200 meters away, the sensor could be
lowered to 12.5 meters.
When the sensor is mounted on a building, the
building itself disturbs the wind flow and must be
taken into account before installation. For large
buildings, other than buildings such as lighthouses
and skyscrapers, the sensor must be mounted as far
away from the edge of the building as possible and
at a height at least 3/4 the height of the building.
Thus, with a building 28 meters high, a rooftop
tower at least 21 meters high should be used.
Minimum height above ground level
of anemometer
1.75h to 2.25h
1.67h
1.50h
1.25h
1.13h
h
Table 11
1
Handbook of Meteorological Instruments, 2nd Edition. Measurement of Surface
Wind, Volume 4. London, HMSO: 1981
Page 1
2031 MICRO RESPONSE ANEMOMETER
Mounting
Orientation
The Model 2031 Micro Response Anemometer
mounts directly to the Model 2023 Crossarm without any additional accessories. The crossarm is
generally used to mount one each Model 2031 Anemometer and a Model 2020 Vane to form a wind
speed and direction measurement set. If the Model
2031 Anemometer is to be mounted separately, a
Model 20231 Mast Adapter should be ordered as
an accessory. Both the Model 2023 Crossarm and
the Model 20231 Mast Adapter will mount on a
mast with an outside diameter of 1" (25.4 mm) or
3 /4" Schedule 40 pipe. Set screws are provided in
either case for securing to the mast. The lower part
of the anemometer body will slip over the pin on
the crossarm or the mast adapter. When in place,
tighten all mounting screws.
The anemometer should be mounted with its axis as
close to vertical as possible to provide for the best
measurement of horizontal wind movement. If the
sensor must be removed the sensor from the mounting adapter or crossarm, loosen only the allen head
screw on the sensor base and slide the sensor off the
adapter. Do not remove the mounting pin from the
crossarm or the mast adapter from the mast, since
these serve to maintain sensor alignment.
Connection
Pre-assembled cables in three lengths are available
for connecting the 2031 to a data collection device:
Cable Number
20305
20306
20307
Length
25'
50'
200'
These cables are equipped with a mating connector on the sensor end and unterminated wires at
the opposite end. Connect the unterminated wires
to the data collection device as shown in Figure 1.
(Note that only two of the cable's wires (BLACK
and GREEN) are used.)
Page 2
Theory of Operation
The Model 2031 Micro Response Anemometer uses
a miniature DC generator as a transducer. The shaft
couples the cup assembly to the generator. The output of the generator is approximately 7.0 mV/ mph.
A small filter capacitor should be placed across the
output lines to filter out any noise.
Page 3
Calibration
The output of the sensor can be determined by spinning the shaft at a known rpm and extrapolating the
data from the chart in Table 2.
Calibration data in Table 2 has been developed
from operating the anemometer in a wind tunnel
equipped with NBS-traceable measuring instruments.
The Model 1200 Wind Speed Conditioning
Module (when used) is equipped with a calibration
feature consisting of a voltage divider circuit and a
switch to apply the voltage to the signal conditioning circuitry. This feature allows the operator to
quickly set up the output signals for zero and full
scale values. Refer to the Model 1200 manual for
additional information.
Whenever maintenance is performed on the
anemometer or the generator, shaft, or bearings are
replaced, the anemometer must be re-calibrated.
Spin the shaft at 1800, 600, and/or 300 rpm
and measure the output voltage. Of the value has
changed, readjust the module input scaling voltages; or, if a data logger is used, recalculate the slope
and intercept equation. The anemometer output will
change whenever the generator is replaced due to
variations between generators.
Model 2031 Micro Response Anemometer Serial No. ________________
Shaft Speed
rpm
50
60
120
300
900
1008
1500
1800
2027
2042
2270
Wind Speed
mph
3.0
3.5
6.4
15.24
44.7
50.0
74.1
88.8
100.0
100.7
111.9
Wind Speed
m/s
1.33
1.55
2.9
6.8
20.0
22.4
33.1
39.7
44.7
45.0
50.0
Table 2
Calibration Table
Page 4
Output
VDC
_________
_________
_________
_________
_________
_________
_________
_________
_________
_________
_________
Maintenance
The anemometer bearings should be inspected
for wear periodically. The bearings are sealed and
protected to prevent dirt and moisture from entering. With time, however, the seals will no longer
prevent dirt from entering the bearing race and the
bearings may fail. The bearings may be replaced in
the field or the anemometer may be returned to All
Weather, Inc. for servicing.
Since corrosion is the main problem associated
with wind sensors, apply a thick coating of silicon
lubricant to the connector shell after the connector
is attached and in place. Also, use a noncorrosive
lubricant such as Loctite Silver Grade Anti-Seize
Compound on all screws and fasteners whenever
disassembly of the sensor is required. The use of
these lubricants will make servicing of the sensor
easier and will prevent seizure of the fastening
hardware. It is also advisable to apply lubricant
to the mounting adapter surfaces prior to final
sensor installation. A commercial grade lubricant
recommended for use is DOOR-EASE, available
at hardware and automotive stores. In addition to
these precautions, check that the drain hole in the
base of the sensor is free of debris so that water
drains away rather than collecting within the sensor. Follow the steps below to replace the bearings
in the field.
1 Loosen the two set screws on the cup assembly
hub. Remove the cup assembly.
2 Remove the lower body section by removing
three recessed 6-32 screws.
3 Remove the generator and mounting adapter
from the anemometer housing by removing the 3
screws around the edge of the adapter. Lift both
parts together. The generator is held in place by
a set screw on the side of the adapter. Loosen
the set screw. Push forward on the base of the
generator until the generator and brush-coupler
emerge from the large opening in the adapter. A
set screw secures the brush-coupler to the gen-
4
5
6
7
8
9
erator shaft. Loosen the set screw and remove
the brush coupler. Now the generator can be
extracted from the mounting adapter. Use care
to avoid damage to the generator wires. To fully
replace the generator, unsolder or cut the wires
from the 4-pin connector. Upon reassembly,
resolder the wires (red to pin A, black to pin B)
and coat the soldered portions of the wires with
a waterproof sealing compound.
Remove the E-clip from the shaft at the top of
the unit and slide the entire shaft down and out
of the unit, taking care not to bend the shaft.
Lift the upper bearing out by working a knife
edge under the flanged outer race. Do not use
excess force or hammer the bearings.
Using a rod of about ¼" diameter passed down
from the top, carefully knock the lower bearing
out.
Clean all parts and install new bearings. Press
the bearings in place by applying pressure to the
outer race only. The bearing could be damaged
by pressing against the inner race.
Reassemble all parts in the reverse order of disassembly. If the generator has been unsoldered
from the connector, reroute the wires through the
connector hole from the inside to the outside of
the housing and resolder the wires to the connector pins A and B. Insert the shaft of the generator
into the small end of the mounting adapter and
carefully push it through to the other side.
Install the brush coupler onto the generator shaft.
Secure the coupler set screw. Push the generator back into the mounting adapter and the end
of the generator will sit inside the smaller end
of the adapter. Place the generator so that it is
either flush with the back edge of the adapter or
extends beyond the edge of the adapter, between
0.000 and 0.300 inches. Secure the generator
into place by tightening the set screw in the side
of the adapter.
Page 5
2031 MICRO RESPONSE ANEMOMETER
10 Locate the anemometer main shaft assembly.
Place an E-clip into the groove adjacent to the
wire prongs. Slide one or two spacer washers
onto the shaft. These washers eliminate the
movement of the shaft between the bearings.
Place the lower housing bearing onto the shaft
with the shoulder of the bearing case toward the
wire prongs. Insert the top end of the shaft up
into the housing from the inside of the housing.
Holding the shaft in place, slide on the upper
bearing and install the upper E-clip.
11 Check the shaft for easy, smooth rotation. Also
check for end-to-end movement. If the shaft
and bearings move in and out of the housing
add more spacer washers. If there is no shaft
movement or the rotation seems to be stiff or
hampered, remove one or more of the spacers.
12 Upon installation of the shaft assembly, insert
the generator and mounting adapter into the anemometer housing so that the shaft prongs insert
into the brush of the brush-coupler. Make certain that he mounting adapter is seated into the
anemometer housing. Rotate the shaft by hand
and check for smooth operation. Also monitor
the connector wires and make certain that there
is an output voltage produced when the shaft is
turned. Notice that rotating the shaft in the direction opposite to that of the cup assembly rotation
will produce a negative output voltage. Secure
the generator and mounting adapter assembly
into the housing using 3 4-40 x 1/2" screws. Use
split lock washers to lock the screws into place.
Page 6
13 Install the connector into the housing if it has
been removed and replace the lower housing
onto the upper housing. Make certain that the
housing O-rings are in position to assure sealing
of the body.
14 Should there be any problems with the generator,
it should be replaced. Check for proper voltage
polarity prior to connecting the signal conditioning module to the new assembly.
Use great care in disassembly and reassembly of
the sensor. Never use excessive force to make parts
fit together. Over-tightening of fasteners will either
break the fastener or damage the machined threads
of the sensor.
Any difficulties encountered during servicing that are not correctable by the user should be
referred to the All Weather, Inc. Customer Service
Department.
Maintenance Kit
A maintenance kit (P/N M488141) is available for
the Model 2031 that provides the parts necessary
for basic upkeep of the instrument. The kit includes
those parts that are the most susceptible to wear,
such as bearings and set screws. To order this kit,
contact All Weather, Inc. and specify Part Number
M488141.
Warranty
Unless specified otherwise, All Weather Inc.
(the Company) warrants its products to be free from
defects in material and workmanship under normal
use and service for one year from date of shipment,
subject to the following conditions:
a. The obligation of the Company under this warranty is limited to repairing or replacing items or
parts which have been returned to the Company
and which upon examination are disclosed, to
the Company’s satisfaction, to have been defective in material or workmanship at time of
manufacture.
b. The claimant shall pay the cost of shipping
any part or instrument to the Company. If the
Company determines the part to be defective in
material or workmanship, the Company shall
prepay the cost of shipping the repaired instrument to the claimant. Under no circumstances
will the Company reimburse claimant for cost
incurred in removing and/or reinstalling replacement parts.
c. This warranty shall not apply to any Company
products which have been subjected to misuse,
negligence, or accident.
d. This warranty and the Company’s obligation
thereunder is in lieu of all other warranties,
express or implied, including warranties of
merchantability and fitness for a particular
purpose, consequential damages, and all other
obligations or liabilities.
No other person or organization is authorized to
give any other warranty or to assume any additional
obligation on the Company’s behalf, unless made
in writing and signed by an authorized officer of
the Company.
Page 7
Specifications
Threshold ............................................................................................ 1 mph
Accuracy ............................................................................±0.15 mph or 1%
Distance constant ..................................................................................5 feet
Range ......................................................................... 0-100 mph (0-45 m/s)
Shaft torque .......................................................... 0.05-0.06 ounces per inch
Cup material ...................................................... Carbon/Graphite composite
Turning radius .........................................................................................3.8”
Body size............................................12” H x 2¾” diameter (305 x 70 mm)
Weight/Shipping................................................ 2.5 lbs/7 lbs (1.1 kg/3.2 kg)
Mounting .......................................................................... Direct to crossarm
or with adapter to 1” (25.4 mm) O.D. mast
DC output ..................................................................... approx. 7.0 mV/mph
Page 8
Drawings
The following pages include reference drawings to assist in installation and maintenance of this
instrument.
Page 9
All Weather Inc.
1165 National Drive
Sacramento, CA 95818
Fax: 916.928.1165
Phone: 916.928.1000
Toll Free: 800.824.5873
2031-001
ECO 1369
Rev. B
January, 2009
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