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.
EN ISO 4373:2022 history
2022EN ISO 4373:2022 Hydrometry - Water level measuring devices (ISO 4373:2022)
2008EN ISO 4373:2008 Hydrometry - Water level measuring devices (ISO 4373:2008)