ISO 4373:2022
Hydrometry — Water level measuring devices
This document specifies the functional requirements of instrumentation for measuring the level of water surface (stage), primarily for the purpose of determining flow rates.
This document is supplemented by Annex A, which provides guidance on the types of automatic water level measurement devices currently available and the measurement uncertainty associated with them. The manually operated measuring devices are described in Annex B.
This document is applicable to both contact and non-contact methods of measurement. The non-contact methods are not in direct material contact with the water surface but measure the height of the water level with ultrasonic or electromagnetic waves.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Instrument specification
4.1 Performance parameters
4.2 Performance classification
4.3 Maximum rate of change
4.4 Environment
4.4.1 General
4.4.2 Temperature
4.4.3 Relative humidity
4.5 Timing
4.5.1 General
4.5.2 Digital
4.5.3 Analogue
5 Recording
5.1 General
5.2 Chart recorders
5.3 Data loggers
6 Enclosure
7 Installation
8 Maintenance
9 Estimation of measurement uncertainty
9.1 General
9.2 Type A uncertainty estimation
9.3 Type B uncertainty estimation
9.4 Uncertainty in case of low water level conditions
9.5 Level measurement datum
9.6 Combining primary measurement uncertainties
Annex A (informative) Types of water level measuring devices
Annex B (informative) Manually operated measuring devices
Annex C (informative) Recording devices
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Instrument specification
4.1 Performance parameters
4.2 Performance classification
4.3 Maximum rate of change
4.4 Environment
4.4.1 General
4.4.2 Temperature
4.4.3 Relative humidity
4.5 Timing
4.5.1 General
4.5.2 Digital
4.5.3 Analogue
5 Recording
5.1 General
5.2 Chart recorders
5.3 Data loggers
6 Enclosure
7 Installation
8 Maintenance
9 Estimation of measurement uncertainty
9.1 General
9.2 Type A uncertainty estimation
9.3 Type B uncertainty estimation
9.4 Uncertainty in case of low water level conditions
9.5 Level measurement datum
9.6 Combining primary measurement uncertainties
Annex A (informative) Types of water level measuring devices
Annex B (informative) Manually operated measuring devices
Annex C (informative) Recording devices
Bibliography