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.

Navires et technologie maritime -- Performances des capteurs marins

General Information

Status
Published
Publication Date
25-Jan-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
29-Dec-2020
Completion Date
29-Dec-2020
Ref Project

Buy Standard

Standard
ISO 22013:2021 - Marine environment sensor performance -- Specifications, testing and reporting -- General requirements
English language
44 pages
sale 15% off
Preview
sale 15% off
Preview
Draft
ISO/PRF 22013:Version 12-dec-2020 - Marine environment sensor performance -- Specifications, testing and reporting -- General requirements
English language
44 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 22013
First edition
2021-01
Marine environment sensor
performance — Specifications,
testing and reporting — General
requirements
Navires et technologie maritime — Performances des capteurs marins
Reference number
ISO 22013:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 22013:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 22013:2021(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3  Terms and definitions ..................................................................................................................................................................................... 1

4  Specifications ........................................................................................................................................................................................................14

4.1 General ........................................................................................................................................................................................................14

4.2 Calibration ...............................................................................................................................................................................................14

4.3 Range ............................................................................................................................................................................................................15

4.3.1 Calibrated range ............................................................................................................................................................15

4.3.2 Measuring range............................................................................................................................................................15

4.3.3 Maximum range .............................................................................................................................................................15

4.4 Accuracy .....................................................................................................................................................................................................15

4.5 Resolution ................................................................................................................................................................................................15

4.6 Response time.......................................................................................................................................................................................15

4.7 Depth and pressure ..........................................................................................................................................................................15

4.7.1 Maximum depth rating ............................................................................................................................................15

4.7.2 Crush depth rating .................. .................................................... .................................................................................15

4.8 Sample rate ..............................................................................................................................................................................................15

4.9 Mechanical ...............................................................................................................................................................................................15

4.9.1 Wetted materials ...........................................................................................................................................................15

4.9.2 Exterior dimensions...................................................................................................................................................16

4.9.3 Mass or weight in air .................................................................................................................................................16

4.9.4 Weight in freshwater .................................................................................................................................................16

4.9.5 Weight in seawater ........................................................................................................................................... ...........16

4.9.6 Operating temperature range ............................................................................................................................16

4.10 Electrical ....................................................................................................................................................................................................16

4.10.1 Input voltage range .....................................................................................................................................................16

4.10.2 Operating power consumption ........................................................................................................................17

4.10.3 Startup power consumption ...............................................................................................................................17

4.11 Interface .....................................................................................................................................................................................................17

4.11.1 Electrical connections ..............................................................................................................................................17

4.11.2 Communications protocol.....................................................................................................................................17

4.12 Stability .......................................................................................................................................................................................................17

4.13 Shelf-life .....................................................................................................................................................................................................18

5 Test methods ..........................................................................................................................................................................................................18

5.1 Overview ...................................................................................................................................................................................................18

5.2 General experimental design ...................................................................................................................................................18

5.2.1 General...................................................................................................................................................................................18

5.2.2 Sensor settings................................................................................................................................................................18

5.2.3 Reference .............................................................................................................................................................................18

5.2.4 Re-calibration ..................................................................................................................................................................18

5.3 Calibration ...............................................................................................................................................................................................18

5.3.1 General...................................................................................................................................................................................18

5.3.2 Calibration method .....................................................................................................................................................19

5.3.3 Experimental design — Layout of the calibration ...........................................................................19

5.3.4 Calibration curve ..........................................................................................................................................................19

5.3.5 Post-calibration operations .................................................................................................................................20

5.4 Accuracy .....................................................................................................................................................................................................20

5.4.1 General...................................................................................................................................................................................20

5.4.2 Modifications to ISO 5725 ....................................................................................................................................20

5.4.3 Statistical model ............................................................................................................................................................21

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 22013:2021(E)

5.4.4 Determination of precision ..................................................................................................................................21

5.4.5 Experimental design — Layout of the precision experiment .................................................22

5.4.6 Reference .............................................................................................................................................................................23

5.4.7 Determination of trueness (bias) ...................................................................................................................23

5.4.8 Statistical analysis ...................................................................... ..................................................................................23

5.5 Resolution ................................................................................................................................................................................................23

5.5.1 General...................................................................................................................................................................................23

5.5.2 Experimental design ..................................................................................................................................................24

5.5.3 Calculation of s ........................................................................................................................................... .......24

noise

5.5.4 Calculation of s ..............................................................................................................................................24

noise

5.6 Response time.......................................................................................................................................................................................24

5.6.1 General...................................................................................................................................................................................24

5.6.2 Experimental design ..................................................................................................................................................24

5.6.3 Response curve ..............................................................................................................................................................25

5.7 Depth and pressure ..........................................................................................................................................................................26

5.7.1 Maximum depth rating ............................................................................................................................................26

5.7.2 Crush depth rating .................. .................................................... .................................................................................27

5.7.3 Pressure case void .......................................................................................................................................................27

5.8 Mechanical ...............................................................................................................................................................................................27

5.8.1 Wetted materials ...........................................................................................................................................................27

5.8.2 Weight in freshwater .................................................................................................................................................27

5.8.3 Weight in seawater ........................................................................................................................................... ...........28

5.8.4 Operating temperature range ............................................................................................................................28

5.9 Electrical ....................................................................................................................................................................................................28

5.9.1 Input voltage range .....................................................................................................................................................28

5.9.2 Operating power consumption ........................................................................................................................28

5.9.3 Startup power consumption ...............................................................................................................................29

5.10 Interface .....................................................................................................................................................................................................29

5.10.1 General...................................................................................................................................................................................29

5.10.2 Power on/standby .......................................................................................................................................................29

5.10.3 Galvanic isolation test ........................................................................................................................................... ....29

5.11 Stability .......................................................................................................................................................................................................29

5.11.1 General...................................................................................................................................................................................29

5.11.2 Experimental design ..................................................................................................................................................29

5.11.3 Calculation of d ..............................................................................................................................................................30

5.11.4 Field stability ...................................................................................................................................................................31

5.12 Shelf-life .....................................................................................................................................................................................................31

5.12.1 General...................................................................................................................................................................................31

5.12.2 Experimental design ..................................................................................................................................................31

5.12.3 Calculation of d ..............................................................................................................................................................31

6 Publication ...............................................................................................................................................................................................................31

6.1 General ........................................................................................................................................................................................................31

6.2 Data sheets ..............................................................................................................................................................................................32

6.2.1 General...................................................................................................................................................................................32

6.2.2 Test reports........................................................................................................................................................................33

6.3 Calibration certificates ..................................................................................................................................................................33

Annex A (informative) Determination of the accuracy (precision and trueness) — Example ..............35

Annex B (informative) Determination of the response time — Examples .................................................................39

Annex C (informative) Data sheet for a sound velocity sensor — Example ..............................................................43

Bibliography .............................................................................................................................................................................................................................44

iv © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 22013:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2. www .iso .org/ directives

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received. www .iso .org/ patents

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,

Subcommittee SC 13, Marine technology.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2021 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO 22013:2021(E)
Introduction

Oceans are intertwined with many of humanity’s priorities, including trade, food, energy, climate

and security. Understanding what’s going on below the sea surface is important for making decisions

around maritime boundaries, exploiting energy and mineral resources, expanding waterways, and

monitoring aquaculture. All depend on the availability of data produced by marine environment sensors

that measure physical, ecological and chemical parameters of seawater, such as salinity, temperature,

oxygen, carbon dioxide and acidity.

As an example of the growing importance of these data, marine business is increasingly mandated

by law to record them to meet environmental regulations. But common definitions for even basic

performance specifications of these sensors, such as accuracy or stability, don't exist. This weakens

the utility of the laws and diminishes confidence in sensor performance. It also acts to dampen the

market forces driving sensor innovation, as it is difficult for end-users to compare and reward true

breakthroughs from existing manufacturers, or to trust new entrants. This document aims to address

this by establishing a set of performance specifications common to all marine environment sensors,

including terms, definitions and test methods.
vi © ISO 2021 – All rights reserved
---------------------- Page: 6 ----------------------
INTERNATIONAL STANDARD ISO 22013:2021(E)
Marine environment sensor performance — Specifications,
testing and reporting — General requirements
1 Scope

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.

2 Normative references

The following documents are referred to in the text in such a way that some or all their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 5725-2:2019, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic

method for the determination of repeatability and reproducibility of a standard measurement method

ISO/IEC 17025:2017, General requirements for the competence of testing and calibration laboratories

3  Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
quantity
parameter

property of a phenomenon, body, or substance, where the property has a magnitude that can be

expressed as a number and a reference

Note 1 to entry: A reference can be a measurement unit, a measurement procedure, a reference material, or a

combination of such.
EXAMPLE Pressure, P
© ISO 2021 – All rights reserved 1
---------------------- Page: 7 ----------------------
ISO 22013:2021(E)

[SOURCE: ISO/IEC Guide 99:2007, 1.1, modified — The admitted term “parameter” has been added.

All Notes have been removed except Note 2 to entry, renumbered as Note 1 to entry. The Example has

been added.]
3.2
derived quantity

quantity (3.1) that has been calculated from one or more measurements of other quantities

[8]

EXAMPLE Absolute salinity, S , is calculated from conductivity, temperature and pressure (IOC 56:2010) .

3.3
quantity value
value
number and reference together, expressing magnitude of a quantity (3.1)
EXAMPLE 1 Conductivity of a volume of seawater: 35 mS/cm or 3, 5 S/m
EXAMPLE 2 Sound speed of a volume of seawater: 1 500 m/s

[SOURCE: ISO/IEC Guide 99:2007, 1.19, modified — All Examples and Notes have been removed. New

Examples 1 and 2 have been added.]
3.4
measurand
quantity (3.1) intended to be measured

Note 1 to entry: The specification of a measurand requires knowledge of the kind of quantity, description of the

state of the phenomenon, body, or substance carrying the quantity, including any relevant component, and the

chemical entities involved.

Note 2 to entry: In the second edition of the VIM and in IEC 60050-300:2001, the measurand is defined as the

'particular quantity subject to measurement'.

Note 3 to entry: The measurement, including the measuring system and the conditions under which the

measurement is carried out, might change the phenomenon, body, or substance such that the quantity being

measured may differ from the measurand as defined. In this case, adequate correction is necessary.

EXAMPLE 1 The conductivity of a volume of seawater with the ambient Celsius temperature of 23 °C will be

different from the conductivity at the specified temperature of 20 °C, which is the measurand. In this case, a

correction is necessary.

EXAMPLE 2 The length of a steel rod in equilibrium with the ambient Celsius temperature of 23 °C will be

different from the length at the specified temperature of 20 °C, which is the measurand. In this case, a correction

is necessary.

[SOURCE: ISO/IEC Guide 99:2007, 2.3, modified — Note 4 has been removed. Example 2 has been

changed.]
3.5
measurement

process of experimentally obtaining one or more quantity values (3.3) that can reasonably be attributed

to a quantity (3.1)
[SOURCE: ISO/IEC Guide 99:2007, 2.1, modified — All Notes have been removed.]
3.6
measurement unit
unit

real scalar quantity (3.1), defined and adopted by convention, with which any other quantity of the same

kind can be compared to express the ratio of the two quantities as a number

Note 1 to entry: Measurement units are designated by conventionally assigned names and symbols.

2 © ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 22013:2021(E)

Note 2 to entry: Measurement units of quantities of the same quantity dimension may be designated by the

same name and symbol even when the quantities are not of the same kind. For example, joule per kelvin and

J/K are respectively the name and symbol of both a measurement unit of heat capacity and a measurement

unit of entropy, which are generally not considered to be quantities of
...

INTERNATIONAL ISO
STANDARD 22013
First edition
Marine environment sensor
performance — Specifications,
testing and reporting — General
requirements
Navires et technologie maritime — Performances des capteurs marins
PROOF/ÉPREUVE
Reference number
ISO 22013:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 22013:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii PROOF/ÉPREUVE © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 22013:2020(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3  Terms and definitions ..................................................................................................................................................................................... 1

4  Specifications ........................................................................................................................................................................................................14

4.1 General ........................................................................................................................................................................................................14

4.2 Calibration ...............................................................................................................................................................................................14

4.3 Range ............................................................................................................................................................................................................15

4.3.1 Calibrated range ............................................................................................................................................................15

4.3.2 Measuring range............................................................................................................................................................15

4.3.3 Maximum range .............................................................................................................................................................15

4.4 Accuracy .....................................................................................................................................................................................................15

4.5 Resolution ................................................................................................................................................................................................15

4.6 Response time.......................................................................................................................................................................................15

4.7 Depth and pressure ..........................................................................................................................................................................15

4.7.1 Maximum depth rating ............................................................................................................................................15

4.7.2 Crush depth rating .................. .................................................... .................................................................................15

4.8 Sample rate ..............................................................................................................................................................................................15

4.9 Mechanical ...............................................................................................................................................................................................15

4.9.1 Wetted materials ...........................................................................................................................................................15

4.9.2 Exterior dimensions...................................................................................................................................................16

4.9.3 Mass or weight in air .................................................................................................................................................16

4.9.4 Weight in freshwater .................................................................................................................................................16

4.9.5 Weight in seawater ........................................................................................................................................... ...........16

4.9.6 Operating temperature range ............................................................................................................................16

4.10 Electrical ....................................................................................................................................................................................................16

4.10.1 Input voltage range .....................................................................................................................................................16

4.10.2 Operating power consumption ........................................................................................................................17

4.10.3 Startup power consumption ...............................................................................................................................17

4.11 Interface .....................................................................................................................................................................................................17

4.11.1 Electrical connections ..............................................................................................................................................17

4.11.2 Communications protocol.....................................................................................................................................17

4.12 Stability .......................................................................................................................................................................................................17

4.13 Shelf-life .....................................................................................................................................................................................................18

5 Test methods ..........................................................................................................................................................................................................18

5.1 Overview ...................................................................................................................................................................................................18

5.2 General experimental design ...................................................................................................................................................18

5.2.1 General...................................................................................................................................................................................18

5.2.2 Sensor settings................................................................................................................................................................18

5.2.3 Reference .............................................................................................................................................................................18

5.2.4 Re-calibration ..................................................................................................................................................................18

5.3 Calibration ...............................................................................................................................................................................................18

5.3.1 General...................................................................................................................................................................................18

5.3.2 Calibration method .....................................................................................................................................................19

5.3.3 Experimental design — Layout of the calibration ...........................................................................19

5.3.4 Calibration curve ..........................................................................................................................................................19

5.3.5 Post-calibration operations .................................................................................................................................20

5.4 Accuracy .....................................................................................................................................................................................................20

5.4.1 General...................................................................................................................................................................................20

5.4.2 Modifications to ISO 5725 ....................................................................................................................................20

5.4.3 Statistical model ............................................................................................................................................................21

© ISO 2020 – All rights reserved PROOF/ÉPREUVE iii
---------------------- Page: 3 ----------------------
ISO 22013:2020(E)

5.4.4 Determination of precision ..................................................................................................................................21

5.4.5 Experimental design — Layout of the precision experiment .................................................22

5.4.6 Reference .............................................................................................................................................................................23

5.4.7 Determination of trueness (bias) ...................................................................................................................23

5.4.8 Statistical analysis ...................................................................... ..................................................................................23

5.5 Resolution ................................................................................................................................................................................................23

5.5.1 General...................................................................................................................................................................................23

5.5.2 Experimental design ..................................................................................................................................................24

5.5.3 Calculation of s ...................................................................................................................................................24

noise

5.5.4 Calculation of s ...................................................................................................................................................24

noise

5.6 Response time.......................................................................................................................................................................................24

5.6.1 General...................................................................................................................................................................................24

5.6.2 Experimental design ..................................................................................................................................................24

5.6.3 Response curve ..............................................................................................................................................................25

5.7 Depth and pressure ..........................................................................................................................................................................26

5.7.1 Maximum depth rating ............................................................................................................................................26

5.7.2 Crush depth rating .................. .................................................... .................................................................................27

5.7.3 Pressure case void .......................................................................................................................................................27

5.8 Mechanical ...............................................................................................................................................................................................27

5.8.1 Wetted materials ...........................................................................................................................................................27

5.8.2 Weight in freshwater .................................................................................................................................................27

5.8.3 Weight in seawater ........................................................................................................................................... ...........28

5.8.4 Operating temperature range ............................................................................................................................28

5.9 Electrical ....................................................................................................................................................................................................28

5.9.1 Input voltage range .....................................................................................................................................................28

5.9.2 Operating power consumption ........................................................................................................................28

5.9.3 Startup power consumption ...............................................................................................................................29

5.10 Interface .....................................................................................................................................................................................................29

5.10.1 General...................................................................................................................................................................................29

5.10.2 Power on/standby .......................................................................................................................................................29

5.10.3 Galvanic isolation test ........................................................................................................................................... ....29

5.11 Stability .......................................................................................................................................................................................................29

5.11.1 General...................................................................................................................................................................................29

5.11.2 Experimental design ..................................................................................................................................................29

5.11.3 Calculation of d ...............................................................................................................................................................30

5.11.4 Field stability ...................................................................................................................................................................31

5.12 Shelf-life .....................................................................................................................................................................................................31

5.12.1 General...................................................................................................................................................................................31

5.12.2 Experimental design ..................................................................................................................................................31

5.12.3 Calculation of d ............................................................................................................................................................... 31

6 Publication ...............................................................................................................................................................................................................31

6.1 General ........................................................................................................................................................................................................31

6.2 Data sheets ..............................................................................................................................................................................................32

6.2.1 General...................................................................................................................................................................................32

6.2.2 Test reports........................................................................................................................................................................33

6.3 Calibration certificates ..................................................................................................................................................................33

Annex A (informative) Determination of the accuracy (precision and trueness) — Example ..............35

Annex B (informative) Determination of the response time — Examples .................................................................39

Annex C (informative) Data sheet for a sound velocity sensor — Example ..............................................................43

Bibliography .............................................................................................................................................................................................................................44

iv PROOF/ÉPREUVE © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 22013:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2. www .iso .org/ directives

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received. www .iso .org/ patents

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,

Subcommittee SC 13, Marine technology.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2020 – All rights reserved PROOF/ÉPREUVE v
---------------------- Page: 5 ----------------------
ISO 22013:2020(E)
Introduction

Oceans are intertwined with many of humanity’s priorities, including trade, food, energy, climate

and security. Understanding what’s going on below the sea surface is important for making decisions

around maritime boundaries, exploiting energy and mineral resources, expanding waterways, and

monitoring aquaculture. All depend on the availability of data produced by marine environment sensors

that measure physical, ecological and chemical parameters of seawater, such as salinity, temperature,

oxygen, carbon dioxide and acidity.

As an example of the growing importance of these data, marine business is increasingly mandated

by law to record them to meet environmental regulations. But common definitions for even basic

performance specifications of these sensors, such as accuracy or stability, don't exist. This weakens

the utility of the laws and diminishes confidence in sensor performance. It also acts to dampen the

market forces driving sensor innovation, as it is difficult for end-users to compare and reward true

breakthroughs from existing manufacturers, or to trust new entrants. This document aims to address

this by establishing a set of performance specifications common to all marine environment sensors,

including terms, definitions and test methods.
vi PROOF/ÉPREUVE © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
INTERNATIONAL STANDARD ISO 22013:2020(E)
Marine environment sensor performance — Specifications,
testing and reporting — General requirements
1 Scope

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.

2 Normative references

The following documents are referred to in the text in such a way that some or all their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 5725-2:2019, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic

method for the determination of repeatability and reproducibility of a standard measurement method

ISO/IEC 17025:2017, General requirements for the competence of testing and calibration laboratories

3  Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
quantity
parameter

property of a phenomenon, body, or substance, where the property has a magnitude that can be

expressed as a number and a reference

Note 1 to entry: A reference can be a measurement unit, a measurement procedure, a reference material, or a

combination of such.
EXAMPLE Pressure, P
© ISO 2020 – All rights reserved PROOF/ÉPREUVE 1
---------------------- Page: 7 ----------------------
ISO 22013:2020(E)

[SOURCE: ISO/IEC Guide 99:2007, 1.1, modified — The admitted term “parameter” has been added.

All Notes have been removed except Note 2 to entry, renumbered as Note 1 to entry. The Example has

been added.]
3.2
derived quantity

quantity (3.1) that has been calculated from one or more measurements of other quantities

[8]

EXAMPLE Absolute salinity, S , is calculated from conductivity, temperature and pressure (IOC 56:2010) .

3.3
quantity value
value
number and reference together, expressing magnitude of a quantity (3.1)
EXAMPLE 1 Conductivity of a volume of seawater: 35 mS/cm or 3, 5 S/m
EXAMPLE 2 Sound speed of a volume of seawater: 1 500 m/s

[SOURCE: ISO/IEC Guide 99:2007, 1.19, modified — All Examples and Notes have been removed. New

Examples 1 and 2 have been added.]
3.4
measurand
quantity (3.1) intended to be measured

Note 1 to entry: The specification of a measurand requires knowledge of the kind of quantity, description of the

state of the phenomenon, body, or substance carrying the quantity, including any relevant component, and the

chemical entities involved.

Note 2 to entry: In the second edition of the VIM and in IEC 60050-300:2001, the measurand is defined as the

'particular quantity subject to measurement'.

Note 3 to entry: The measurement, including the measuring system and the conditions under which the

measurement is carried out, might change the phenomenon, body, or substance such that the quantity being

measured may differ from the measurand as defined. In this case, adequate correction is necessary.

EXAMPLE 1 The conductivity of a volume of seawater with the ambient Celsius temperature of 23 °C will be

different from the conductivity at the specified temperature of 20 °C, which is the measurand. In this case, a

correction is necessary.

EXAMPLE 2 The length of a steel rod in equilibrium with the ambient Celsius temperature of 23 °C will be

different from the length at the specified temperature of 20 °C, which is the measurand. In this case, a correction

is necessary.

[SOURCE: ISO/IEC Guide 99:2007, 2.3, modified — Note 4 has been removed. Example 2 has been

changed.]
3.5
measurement

process of experimentally obtaining one or more quantity values (3.3) that can reasonably be attributed

to a quantity (3.1)
[SOURCE: ISO/IEC Guide 99:2007, 2.1, modified — All Notes have been removed.]
3.6
measurement unit
unit

real scalar quantity (3.1), defined and adopted by convention, with which any other quantity of the same

kind can be compared to express the ratio of the two quantities as a number

Note 1 to entry: Measurement units are designated by conventionally assigned names and symbols.

2 PROOF/ÉPREUVE © ISO 2020 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 22013:2020(E)

Note 2 to entry: Measurement units of quantities of the same quantity dimension may be designated by the

same name and symbol even when the quantities are not of the same kind. For example, joule per kelvin and

J/K are respectively the name and symbol of both a measurement unit of heat
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.