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AS 3778.6.7-1992

Withdrawn
Withdrawn

A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

Measurement of water flow in open channels Measuring devices, instruments and equipment - Ultrasonic (acoustic) velocity meters
Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Withdrawn date

03-09-2022

Language(s)

English

Published date

04-16-1992

Preview

1 - AS 3778.6.7-1992 MEASUREMENT OF WATER FLOW IN OPEN CHANNELS - MEASURING DEVICES, INSTRUMENTS AND EQUIPMENT-ULTRASONIC...
4 - PREFACE
5 - CONTENTS
6 - 1 Scope and field of application
6 - 2 References
6 - 3 Definitions
6 - 4 Units of measurement
6 - 5 General
6 - 6 Principle of operation
6 - 6.1 Travel time method
7 - 6.2 Sing-around method
7 - 6.3 Difference frequency method
7 - 6.4 Differential travel time method
8 - 6.5 Measurement of time
8 - 7 Characteristics of sound in water
8 - 7.1 Speed of sound in water
8 - 7.2 Transmission of sound in water
8 - 7.2.1 Spreading loss
8 - 7.2.2 Attenuation loss
9 - 7.3 Reverberation
9 - 8 Instrument performance criteria
9 - 8.1 Underwater assembly
9 - 8.1.1 Transducers and cabling
9 - 8.1.2 Mounting assembly
9 - 8.2 Electronic assembly
9 - 8.2.1 Transmitter
9 - 8.2.2 Receiver
10 - 8.2.3 Timer
10 - 8.2.4. Data processor
10 - 9 Site selection
10 - 10 Instrument installation
10 - 11 Operation manual
10 - 12 Calibration
10 - 13 Uncertainties and systematic errors
10 - 13.1 Timing accuracy
11 - 13.2 Velocity of sound variations
11 - 13.3 Crossflow errors
11 - 13.4 Turbulence
11 - 14 Block diagrams
13 - Annex A - Typical minimum clearances with respect to bed and water surface for various path lengths and operating frequencies
14 - Annex B - Systematic errors incurred if the assumed direction of flow is not parallel to the channel axis, for various path l
15 - Annex C - Block diagrams

Describes the general design, operation, performance and application of ultrasonic (acoustic) velocity meters for measurement of flow in open channels. It is identical with and has been reproduced from ISO 6418:1985.

This International Standard describes the general design, operation, performance and application of ultrasonic (acoustic) velocity meters for measurement of flow in open channels.While it is recognized that, theoretically, such meters might operate at any frequency, practical considerations tend to limit applications to frequencies above the acoustic range, that is, greater than 15 kHz. However, the term "acoustic" has been applied in practice, in many countries, to meters of this type irrespective of frequency and the term is retained in this International Standard for that reason.

Committee
CE-024
DocumentType
Standard
ISBN
0 7262 7342 2
Pages
13
PublisherName
Standards Australia
Status
Withdrawn

Standards Relationship
ISO 6418:1985 Identical

First published as AS 3778.6.7-1992.

AS 3778.3.7-1990 Measurement of water flow in open channels Velocity-area methods - Measurement by ultrasonic (acoustic) method
AS 3778.1-2001 Measurement of water flow in open channels Vocabulary and symbols
AS 3778.1-1990 Measurement of water flow in open channels Vocabulary and symbols
AS 3778.3.7-2007 Measurement of water flow in open channels Velocity-area methods - Measurement by ultrasonic (acoustic) method

AS 3778.7-2008 Measurement of water flow in open channels Determination of volume of water and water level in lakes and reservoirs
ATS 4747.3-2008 Meters for non-urban water supply - Specifications for open channel meters

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