ASTM D5089-95(2003)
(Test Method)Standard Test Method for Velocity Measurements of Water in Open Channels with Electromagnetic Current Meters
Standard Test Method for Velocity Measurements of Water in Open Channels with Electromagnetic Current Meters
SIGNIFICANCE AND USE
This test method is particularly used for measuring the velocity at a point in an open channel as part of a velocity-area traverse to determine the flowrate of water. To this end it should be used in conjunction with Test Method D 3858. A single axis probe with cosine response will suffice for most of these applications.
This test method is also useful in applications where the velocity itself (rather than a volumetric flowrate) is the desired end product.
SCOPE
1.1 This test method covers the use of single-axis or dual-axis electromagnetic current meters for the measurement of water velocities in open channels.
1.2 This test method covers only these components and appurtenances of portable open-channel current-meter systems, which are customarily required when an operator is in attendance.
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.
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Designation:D5089–95(Reapproved2003)
Standard Test Method for
Velocity Measurements of Water in Open Channels with
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Electromagnetic Current Meters
This standard is issued under the fixed designation D 5089; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This test method covers the use of single-axis or 3.1 Definitions: For definitions of terms used in this test
dual-axis electromagnetic current meters for the measurement method refer to Terminology D 1129.
of water velocities in open channels. 3.2 Definitions of Terms Specific to This Standard:
1.2 This test method covers only these components and 3.2.1 boundary layer—a relatively thin layer of viscous
appurtenancesofportableopen-channelcurrent-metersystems, influence adjacent to the probe (or any solid) surface caused by
which are customarily required when an operator is in atten- therequirementthatthewatervelocitymustbezeroatthewall.
dance. 3.2.2 cosine response—the ability of a meter, placed at an
1.3 This standard does not purport to address all of the angle to the oncoming flow, to sense the component of velocity
safety concerns, if any, associated with its use. It is the parallel to its axis.
responsibility of the user of this standard to establish appro- 3.2.3 turbulence—irregular condition of flow in which the
priate safety and health practices and determine the applica- variousquantitiesshowarandomvariationwithtimeandspace
bility of regulatory limitations prior to use. coordinates so that statistically distinct average values can be
discerned.
2. Referenced Documents
4. Summary of Test Method
2.1 ASTM Standards:
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D 1129 Terminology Relating to Water 4.1 Electromagnetic liquid flow current meters are based on
D 2777 Practice for Determination of Precision and Bias of the Faraday principle of electromagnetic induction, which
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Applicable Methods of Committee D19 on Water states that voltage is proportional not only to flow speed but
D 3858 Test Method for Open-Channel Flow Measurement also to the magnetic flux density and the distance between
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of Water by Velocity-Area Method electrodes. In the application of the electromagnetic liquid
D 4409 Test Method for Velocity Measurements in Open current meter, a conductor (water) moving in a magnetic field
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Channels with Rotating-Element Current Meters (created from within the sensor) generates a voltage that is
2.2 ISO Standards: proportional to the rate of flow of water through the magnetic
ISO 3454 Liquid Flow Measurement in Open Channels— field. This variable voltage lies in a plane that is perpendicular
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Sounding and Suspension Equipment to both the water velocity vector and the magnetic field vector
ISO 3455 Liquid Flow Measurement in Open Channels— and is sensed by pairs of electrodes.
Calibration of Rotating Element Current Meters in
3 5. Significance and Use
Straight Open Tanks
5.1 This test method is particularly used for measuring the
velocity at a point in an open channel as part of a velocity-area
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This test method is under the jurisdiction of ASTM Committee D19 on Water
traverse to determine the flowrate of water. To this end it
and is the direct responsibility of Subcommittee D19.07 on Sediments, Geomor-
should be used in conjunction with Test Method D 3858.A
phology, and Open-Channel Flow.
single axis probe with cosine response will suffice for most of
Current edition approved June 10, 2003. Published August 2003. Originally
approved in 1990. Last previous edition approved in 1999 as D 5089 – 95 (1999).
these applications.
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Annual Book of ASTM Standards, Vol 11.01.
5.2 This test method is also useful in applications where the
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“Measurement of Liquid Flow in Open Channels,” ISO Standards Handbook
velocity itself (rather than a volumetric flowrate) is the desired
16, 1983.Available fromAmerican National Standards Institute, 25 W. 43rd St., 4th
floor, New York, NY 10036. end product.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D5089–95 (2003)
6. Interferences 7.1.7 All components of the current-meter system shall be
made of materials that have corrosion resistance consistent
6.1 As with any intrusive flow measuring device, electro-
with the intended application. Fabrication material must be
magnetic current meter sensors may be fouled by pieces of
selected to preclude galvanic corrosion, which could create
debris of the type that can cling to or wrap around the sensor
electronic interference and degrade accuracy readings of the
which cou
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