ISO 22804:2023

INTERNATIONAL ISO
STANDARD 22804
First edition
2023-08
Marine technology — General
technical requirement of marine
conductivity-temperature-depth
(CTD) measuring instrument
Technologie maritime — Exigence technique générale de l'instrument
de mesure de la conductivité, de la température et de la profondeur
(CTP) en milieu marin
Reference number
© ISO 2023
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ii
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Technical specifications.3
4.1 General . 3
4.2 Instrument appearance . 3
4.2.1 Cosmetic requirements . 3
4.2.2 Product identification . 3
4.2.3 Instrument fastener . 3
4.3 Measuring performance of instrument and product . 3
4.4 Instrument and product environmental adaptability . 4
4.5 Instrument and product interface and data format . 4
5 Test methods . 4
5.1 Test instrument and equipment . 4
5.2 Appearance inspection . 5
5.3 Instrument and product interface and data format checking . 5
5.4 Measurement performance test . 5
5.4.1 Test requirements . 5
5.4.2 Selected test points . 5
5.4.3 Test preparation . 6
5.4.4 Accuracy measurement of temperature and conductivity . 6
5.4.5 Temperature and conductivity accuracy test . 6
5.4.6 Pressure accuracy test . 7
5.4.7 Resolution test . 8
5.4.8 Stability test. 8
5.5 Environmental adaptability test . 8
6 Test requirements . 9
6.1 Number of instruments to be tested . 9
6.2 Test process . 9
6.3 Qualification requirements . 9
6.4 Delivery requirements . 9
6.5 Supporting documents . 9
7 Marking, packaging, transportation, storage .10
7.1 Marking . 10
7.1.1 Nameplate mark . 10
7.1.2 Packing mark . 10
7.2 Packaging . 10
7.2.1 Packaging requirements . 10
7.2.2 Supporting items . 10
7.3 Transportation . 10
7.3.1 Means of transport . 10
7.3.2 Transport requirement . 11
7.4 Storage . 11
7.4.1 Storage environment . 11
7.4.2 Storage requirements . 11
8 User software .11
8.1 General . 11
8.2 Measurement management . 11
8.3 Parameter calculation . 11
iii
8.4 Data processing.12
Annex A (informative) Examples of record tables for CTD measuring instrument accuracy
test data .13
Annex B (informative) Calculation of practical salinity .16
Annex C (informative) Pressure to depth conversion .19
Bibliography .20
iv
Foreword
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v
Introduction
Oceans are closely related to climate change and disasters, which directly affect human survival. In order
to master the law of ocean change, it is necessary to obtain hydrologic information of ocean profile. The
accuracy of this information depends on the temperature condu
...