ISO 22013:2021
Marine environment sensor performance — Specifications, testing and reporting — General requirements
This document defines terms, specifies test methods and provides reporting requirements for marine sensor specifications to ensure a consistent reporting by manufacturers.
It is applicable to those devices known as conductivity-temperature-depth (CTDs), sound velocity probes, multi-parameter sondes and dissolved gas sensors, that measure parameters such as conductivity, temperature, pressure, sound speed, dissolved oxygen, turbidity, pH, and chlorophyll in seawater.
It is also generally applicable to all marine environment instruments.
NOTE 1: A CTD directly measures conductivity, temperature, and pressure. Depth is derived from pressure using an equation.
NOTE 2: The term sound velocity probe is widely used to describe instruments that measure sound speed. In this document the term ?sound velocity is used when describing the type of sensor, and the term sound speed is used when describing the parameter or measurand, but these terms can be used interchangeably.
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Specifications
4.1 General
4.2 Calibration
4.3 Range
4.3.1 Calibrated range
4.3.2 Measuring range
4.3.3 Maximum range
4.4 Accuracy
4.5 Resolution
4.6 Response time
4.7 Depth and pressure
4.7.1 Maximum depth rating
4.7.2 Crush depth rating
4.8 Sample rate
4.9 Mechanical
4.9.1 Wetted materials
4.9.2 Exterior dimensions
4.9.3 Mass or weight in air
4.9.4 Weight in freshwater
4.9.5 Weight in seawater
4.9.6 Operating temperature range
4.10 Electrical
4.10.1 Input voltage range
4.10.2 Operating power consumption
4.10.3 Startup power consumption
4.11 Interface
4.11.1 Electrical connections
4.11.2 Communications protocol
4.12 Stability
4.13 Shelf-life
5 Test methods
5.1 Overview
5.2 General experimental design
5.2.1 General
5.2.2 Sensor settings
5.2.3 Reference
5.2.4 Re-calibration
5.3 Calibration
5.3.1 General
5.3.2 Calibration method
5.3.3 Experimental design — Layout of the calibration
5.3.4 Calibration curve
5.3.5 Post-calibration operations
5.4 Accuracy
5.4.1 General
5.4.2 Modifications to ISO 5725
5.4.3 Statistical model
5.4.4 Determination of precision
5.4.5 Experimental design — Layout of the precision experiment
5.4.6 Reference
5.4.7 Determination of trueness (bias)
5.4.8 Statistical analysis
5.5 Resolution
5.5.1 General
5.5.2 Experimental design
5.5.3 Calculation of 
5.5.4 Calculation of 
5.6 Response time
5.6.1 General
5.6.2 Experimental design
5.6.3 Response curve
5.7 Depth and pressure
5.7.1 Maximum depth rating
5.7.2 Crush depth rating
5.7.3 Pressure case void
5.8 Mechanical
5.8.1 Wetted materials
5.8.2 Weight in freshwater
5.8.3 Weight in seawater
5.8.4 Operating temperature range
5.9 Electrical
5.9.1 Input voltage range
5.9.2 Operating power consumption
5.9.3 Startup power consumption
5.10 Interface
5.10.1 General
5.10.2 Power on/standby
5.10.3 Galvanic isolation test
5.11 Stability
5.11.1 General
5.11.2 Experimental design
5.11.3 Calculation of d
5.11.4 Field stability
5.12 Shelf-life
5.12.1 General
5.12.2 Experimental design
5.12.3 Calculation of d
6 Publication
6.1 General
6.2 Data sheets
6.2.1 General
6.2.2 Test reports
6.3 Calibration certificates
Annex A (informative) Determination of the accuracy (precision and trueness) — Example
Annex B (informative) Determination of the response time — Examples
Annex C (informative) Data sheet for a sound velocity sensor — Example
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Specifications
4.1 General
4.2 Calibration
4.3 Range
4.3.1 Calibrated range
4.3.2 Measuring range
4.3.3 Maximum range
4.4 Accuracy
4.5 Resolution
4.6 Response time
4.7 Depth and pressure
4.7.1 Maximum depth rating
4.7.2 Crush depth rating
4.8 Sample rate
4.9 Mechanical
4.9.1 Wetted materials
4.9.2 Exterior dimensions
4.9.3 Mass or weight in air
4.9.4 Weight in freshwater
4.9.5 Weight in seawater
4.9.6 Operating temperature range
4.10 Electrical
4.10.1 Input voltage range
4.10.2 Operating power consumption
4.10.3 Startup power consumption
4.11 Interface
4.11.1 Electrical connections
4.11.2 Communications protocol
4.12 Stability
4.13 Shelf-life
5 Test methods
5.1 Overview
5.2 General experimental design
5.2.1 General
5.2.2 Sensor settings
5.2.3 Reference
5.2.4 Re-calibration
5.3 Calibration
5.3.1 General
5.3.2 Calibration method
5.3.3 Experimental design — Layout of the calibration
5.3.4 Calibration curve
5.3.5 Post-calibration operations
5.4 Accuracy
5.4.1 General
5.4.2 Modifications to ISO 5725
5.4.3 Statistical model
5.4.4 Determination of precision
5.4.5 Experimental design — Layout of the precision experiment
5.4.6 Reference
5.4.7 Determination of trueness (bias)
5.4.8 Statistical analysis
5.5 Resolution
5.5.1 General
5.5.2 Experimental design
5.5.3 Calculation of 
5.5.4 Calculation of 
5.6 Response time
5.6.1 General
5.6.2 Experimental design
5.6.3 Response curve
5.7 Depth and pressure
5.7.1 Maximum depth rating
5.7.2 Crush depth rating
5.7.3 Pressure case void
5.8 Mechanical
5.8.1 Wetted materials
5.8.2 Weight in freshwater
5.8.3 Weight in seawater
5.8.4 Operating temperature range
5.9 Electrical
5.9.1 Input voltage range
5.9.2 Operating power consumption
5.9.3 Startup power consumption
5.10 Interface
5.10.1 General
5.10.2 Power on/standby
5.10.3 Galvanic isolation test
5.11 Stability
5.11.1 General
5.11.2 Experimental design
5.11.3 Calculation of d
5.11.4 Field stability
5.12 Shelf-life
5.12.1 General
5.12.2 Experimental design
5.12.3 Calculation of d
6 Publication
6.1 General
6.2 Data sheets
6.2.1 General
6.2.2 Test reports
6.3 Calibration certificates
Annex A (informative) Determination of the accuracy (precision and trueness) — Example
Annex B (informative) Determination of the response time — Examples
Annex C (informative) Data sheet for a sound velocity sensor — Example
Bibliography