DIN EN ISO 4373:2009-01

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Instrument specification
  4.1 Performance classifications
  4.2 General
  4.3 Maximum rate of change
  4.4 Environment
  4.5 Timing
5 Recording
  5.1 Chart recorders
  5.2 Data loggers
6 Enclosure
7 Installation
8 Estimation of measurement uncertainty
  8.1 General
  8.2 Type-A estimation
  8.3 Type-B estimation
  8.4 Level measurement datum
  8.5 Combining primary measurement uncertainties
Annex A (informative) Types of water level measuring
        devices
        A.1 Reference gauges
        A.2 Peak level gauge
        A.3 Mechanical float and counterweight gauges
        A.4 Air reaction gauges
        A.5 Electrical pressure transducers
        A.6 Echo-location, acoustic instruments
        A.7 Echo-location, radar instruments
        A.8 Systems using electrical properties
        A.9 Recording devices
Bibliography
National Annex NA (informative) Bibliography

Defines the functional requirements of instrumentation for measuring the level of water surface (stage), primarily for the purpose of determining flow rates.