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AS 3778.6.1:2022
$120.32
Measurement of water flow in open channels, Part 6.1: Measuring devices, instruments and equipment — Rotating-element current meters (ISO 2537:2007, IDT)
AS 3778.6.1:2022 identically adopts ISO 2537:2007, which specifies the operational requirements, construction, calibration, and maintenance of rotating-element devices for the measurement of flow velocities in open channels.
Table of contents
Header
About this publication
Preface
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle of operation
4.1 Proportionality
4.2 Flow velocity
5 Types of current-meters
5.1 General
5.2 Cup-type current-meter
5.3 Propeller-type current-meter
6 Operational requirements
6.1 Positioning
6.2 Resistance to flow
6.3 Limits of use
7 Characteristics of cup-type and propeller-type current-meter
7.1 General
7.2 Cup-type current-meter
7.3 Propeller-type current-meter
8 Construction features
9 Calibration (rating)
9.1 General
9.2 Conformity of calibration
9.3 Minimum speed of response
9.4 Calibration table
9.5 Types of calibration
9.5.1 General
9.5.2 Individual calibration
9.5.3 Group (standard) calibration
9.6 Recalibration
9.7 Type of suspension
9.8 Uncertainty in calibration
10 Maintenance of current-meter
11 Operational and servicing manual
Annex A
A.1 General construction
A.1.1
A.1.2
A.2 Cup-type current-meter
A.3 Propeller-type current-meter
A.4 Bearings
A.5 Means of counting rotor revolutions
A.5.1 Signals
A.5.2 Signal generating mechanism
A.5.3 Adjustable frequency signals
A.5.4 Signal receiving devices
A.5.4.1 Counter
A.5.4.2 Direct velocity indicator
A.6 Mounting
A.7 Directional control
A.8 Interchangeability of parts
A.9 Materials of construction
Annex B
B.1 General
B.2 Examination
B.3 Inspection
B.4 Cleaning and lubrication
B.5 Signal test
B.6 Spin test
B.6.1 Current-meters with ball bearings or a pivot bearing
