SIST ISO 3455:2021 PDF

Name: SIST ISO 3455:2021 — Hydrometry - Calibration of current-meters in straight open tanks
SKU: SIST ISO 3455:2021
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Hydrometry - Calibration of current-meters in straight open tanks

Название (английский):

SIST ISO 3455:2021

Hydrometry - Calibration of current-meters in straight open tanks

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 17
Дата публикации:: 6 сентября 2021 г.
ICS:: 17.120.20
Технический комитет:: IMIN - Measurement instruments

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Описание (английский):

This document specifies a calibration method for mechanical type, electromagnetic type and acoustic type hydrometric current-meters used for point velocity measurement of flowing water. The method requires towing the instrument through still water in a straight open tank. It includes measuring apparatus, the calibration procedure, the method of presenting the results and the uncertainties associated with the method.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 3455:2021 - Hydrometry - Calibration of current-meters in straight open tanks - specifies a standardized towing-tank method to calibrate mechanical (rotating-element), electromagnetic and acoustic current-meters used for point velocity measurement of flowing water. The method requires towing the instrument through still water in a straight open tank and covers the required measuring apparatus, the calibration procedure, presentation of results and the calculation of measurement uncertainties.

Key topics and technical requirements

Scope of calibration: Applicable to rotating-element, electromagnetic and acoustic current-meters for point velocity measurement.

Calibration principle: Relate towing-cart speed to instrument output (revolutions or indicated velocity) by towing the meter at steady speeds in a straight tank.

Infrastructure: Requirements for tank dimensions (length divided into accelerating, stabilizing, measuring and braking sections), depth and width considerations to avoid systematic errors caused by surface-wave effects.

Towing cart and suspension: Design, track alignment and safe stopping distances; methods to suspend instruments at specified immersion depths.

Measuring equipment: Accurate distance and time measurement, instrumentation for recording current-meter response, and mitigation of errors from residual currents or tank disturbances.

Data acquisition & processing: Collection and analysis procedures to derive calibration curves or correction factors, plus recommended formats for presenting results.

Uncertainty evaluation: Calculation of overall uncertainty for velocity measurement, following accepted measurement-uncertainty principles and considering position, timing and residual flow errors.

Procedure details by meter type: Specific steps for rotating-element meters (suspension, performance, data analysis), electromagnetic meters (mounting, calibration points), and acoustic meters (mounting and analysis).

Practical applications

Establishing traceable calibration for current-meters used in hydrology, river discharge measurement, irrigation studies and environmental monitoring.

Ensuring interoperable, comparable velocity readings across instruments and organizations.

Supporting instrument manufacturers, calibration laboratories and research facilities in producing reliable meter transfer functions and stated uncertainties.

SIST ISO 3455:2021 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications

Who uses ISO 3455:2021

Related standards

Технические детали

ISO 3455:2021

Hydrometry — Calibration of current-meters in straight open tanks

SIST EN ISO 7726:2026

Ergonomics of the thermal environment - Instruments for measuring and monitoring physical quantities (ISO 772…

BS EN ISO 25377:2022

Hydrometric uncertainty guidance (HUG).