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ASTM D5096-02

(Test Method)

Standard Test Method for Determining the Performance of a Cup Anemometer or Propeller Anemometer

Standard Test Method for Determining the Performance of a Cup Anemometer or Propeller Anemometer

SIGNIFICANCE AND USE
This test method will provide a standard for comparison of rotating type anemometers, specifically cup anemometers and propeller anemometers, of different types. Specifications by regulatory agencies (4-7) and industrial societies have specified performance values. This standard provides an unambiguous method for measuring Starting Threshold, Distance Constant, Transfer Function, and Off-Axis Response.
SCOPE
1.1 This test method covers the determination of the Starting Threshold, Distance Constant, Transfer Function, and  Off-Axis Response of a cup anemometer or propeller anemometer from direct measurement in a wind tunnel.
1.2 This test method provides for a measurement of cup anemometer or propeller anemometer performance in the environment of wind tunnel flow. Transference of values determined by these methods to atmospheric flow must be done with an understanding that there is a difference between the two flow systems.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Oct-2002
ICS
07.060 - Geology. Meteorology. Hydrology
Technical Committee
D22 - Air Quality
Drafting Committee
D22.11 - Meteorology
Current Stage
Ref Project

Relations

Replaces
ASTM D5096-96 - Standard Test Method for Determining the Performance of a Cup Anemometer or Propeller Anemometer
Effective Date
10-Oct-2002
Replaced By
ASTM D5096-02(2007) - Standard Test Method for Determining the Performance of a Cup Anemometer or Propeller Anemometer
Effective Date
01-Oct-2007
Referred By
ASTM D1356-20a - Standard Terminology Relating to Sampling and Analysis of Atmospheres
Effective Date
10-Oct-2002
Referred By
ASTM D5741-96(2017) - Standard Practice for Characterizing Surface Wind Using a Wind Vane and Rotating Anemometer
Effective Date
10-Oct-2002

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ASTM D5096-02 - Standard Test Method for Determining the Performance of a Cup Anemometer or Propeller AnemometerASTM D5096-02 - Standard Test Method for Determining the Performance of a Cup Anemometer or Propeller Anemometer
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ASTM D5096-02 - Standard Test Method for Determining the Performance of a Cup Anemometer or Propeller Anemometer
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D5096–02
Standard Test Method for
Determining the Performance of a Cup Anemometer or
1
Propeller Anemometer
This standard is issued under the fixed designation D5096; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope direction of flow. Note that if the anemometer axis is not
aligned with the direction of flow, the calculated wind speed
1.1 This test method covers the determination of the Start-
component parallel to the anemometer axis is used to deter-
ing Threshold, Distance Constant, Transfer Function, and
mine starting threshold.
Off-Axis Response of a cup anemometer or propeller anemom-
3.2.2 distance constant (L, m)—the distance the air flows
eter from direct measurement in a wind tunnel.
past a rotating anemometer during the time it takes the cup
1.2 This test method provides for a measurement of cup
wheelorpropellertoreach(1−1/e)or63%oftheequilibrium
anemometer or propeller anemometer performance in the
3
speed after a step change in wind speed (1). The response of
environment of wind tunnel flow. Transference of values
a rotating anemometer to a step change in which wind speed
determinedbythesemethodstoatmosphericflowmustbedone
increases instantaneously from U =0toU=U is (2):
with an understanding that there is a difference between the f
~2t/ t!
two flow systems.
U 5 U ~1 2 e ! (1)
t f
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
where:
responsibility of the user of this standard to establish appro-
U = is the instantaneous indicated wind speed at time t in
t
priate safety and health practices and determine the applica-
m/s,
bility of regulatory limitations prior to use.
U = isthefinalindicatedwindspeed,orwindtunnelspeed,
f
in m/s,
2. Referenced Documents
t = is the elapsed time in seconds after the step change
2
2.1 ASTM Standards:
occurs, and
D1356 Terminology Relating to Sampling andAnalysis of
t = is the time constant of the instrument.
Atmospheres
DistanceConstantis: L 5 U t (2)
D3631 Test Methods for Measuring Surface Atmospheric f
Pressure
3.2.3 transfer function (Û =a+bR, m/s)—the linear rela-
f
3. Terminology
tionship between wind speed and the rate of rotation of the
3.1 For definitions of terms used in this standard, refer to anemometer throughout the specified working range. Û is the
f
Terminology D1356. predicted wind speed in m/s, a is a constant, commonly called
3.2 Definitions of Terms Specific to This Standard: zero offset, in m/s, b is a constant representing the wind
3.2.1 starting threshold (U ,m/s)—thelowestwindspeedat passageinm/rforeachrevolutionoftheparticularanemometer
o
which a rotating anemometer starts and continues to turn and cup wheel or propeller, and R is the rate of rotation in r/s. It
produce a measurable signal when mounted in its normal should be noted that zero offset is not the same as starting
position. The normal position for cup anemometers is with the threshold. In some very sensitive anemometers the constant a,
axis of rotation vertical, and the normal position for propeller zero offset, may not be significantly greater than zero. The
anemometers is with the axis of rotation aligned with the constantsaandbmustbedeterminedbywindtunnelmeasure-
ment for each type of anemometer (3).
3.2.4 off-axis response (U/(U cos u))—the ratio of the
f
1
indicated wind speed (U) at various angles of attack (u)tothe
This test method is under the jurisdiction of ASTM Committee D22 on
Sampling andAnalysis ofAtmospheres and is the direct responsibility of Subcom-
indicated wind speed at zero angle of attack (U) multiplied by
f
mittee D22.11 on Meteorology.
thecosineoftheangleofattack.Thisratiocomparestheactual
Current edition approved October 10, 2002. Published December 2002. Origi-
off-axis response to a cosine response.
nally published as D5096–90. Last previous edition D5096–96.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
the ASTM website. this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D5096–02
3.3 Symbols: of wind speeds throughout the specified working range. In the
range of wind speeds where the anemometer response is
non-linear (near threshold) a minimum of five data points are
a (m/s) = zero off
...

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5.1 This test method may be used for the determination of calcium, magnesium, potassium, and sodium in atmospheric wet deposition samples.  
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MDL
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