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JJG 628-2019

Chinese Standard: 'JJG 628-2019'
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusRelated Standard
JJG 628-2019English279 Add to Cart Days<=3 Model SLC9 Direct Reading Sea Current Meters Valid JJG 628-2019
JJG 628-2019Chinese18 Add to Cart <=1-day [PDF from Chinese Authority, or Standard Committee, or Publishing House]  

   

BASIC DATA
Standard ID JJG628-2019 (JJG628-2019)
Description (Translated English) Model SLC9 Direct Reading Sea Current Meters
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 14,110
Date of Issue 9/27/2019
Date of Implementation 3/27/2020
Older Standard (superseded by this standard) JJG 628-2019
Drafting Organization Beihai Standard Metrology Center of State Oceanic Administration
Administrative Organization National Technical Committee for Measuring Special Marine Measuring Instruments
Issuing agency(ies) State Administration of Market Supervision and Administration

JJG 628-2019
Model SLC9 Direct Reading Sea Current Meters
National Measurement Verification Regulations of the People's Republic of China
SLC9 direct reading current meter
2019-09-27 release
2020-03-27 Implementation
Issued by the State Administration of Market Supervision and Administration
Verification Regulation of SLC9 Direct Reading Current Meter
CurrentMeters
Replace JJG 628-1989
Focal point: National Technical Committee for Measuring Special Marine Measuring Instruments
Main drafting unit: Beihai Standard Metrology Center of State Oceanic Administration
Participating in the drafting unit: East China Sea Standard Metrology Center of State Oceanic Administration
South China Sea Standard Metrology Center of State Oceanic Administration
This Regulation is entrusted to the National Technical Committee for Measuring Special Marine Instruments for interpretation
The main drafters of this regulation:
Qin Ping (North Sea Standard Metrology Center of State Oceanic Administration)
Zhang Tao (North Sea Standard Metrology Center of State Oceanic Administration)
Li Mingjun (North Sea Standard Metrology Center of State Oceanic Administration)
Participating drafters:
Wu Yichuan (National Oceanic Administration East China Sea Standard Metrology Center)
Feng Bing (Donghai Standard Metrology Center, State Oceanic Administration)
Julong (South China Sea Standard Metrology Center, State Oceanic Administration)
Li Qingchao (South China Sea Standard Metrology Center, State Oceanic Administration)
table of Contents
Introduction (Ⅱ)
1 Scope (1)
2 References (1)
3 Terms and units of measurement (1)
4 Overview (1)
5 Measurement performance requirements (2)
6 General technical requirements (2)
6:1 Appearance (2)
6:2 Data terminal (2)
7 Control of measuring instruments (2)
7:1 Verification conditions (2)
7:2 Verification items (3)
7:3 Verification method (3)
7:4 Processing of verification results (5)
7:5 Verification period (5)
Appendix A Calculation of vehicle speed change rate (6)
Appendix B SLC9 Direct Reading Current Meter Verification Record Format (Reference) (7)
Appendix C Format of the inner page of the certificate of verification/notification of verification results (8)
introduction
JJG 628-2019 "SLC9 type direct reading current meter" based on JJF1001-2011 "General Measurement Terms and Definitions
"Righteousness", JJF1002-2010 "Rules for the Compilation of National Metrological Verification Regulations"
The current meter was revised:
Compared with JJG 628-1989, in addition to editorial changes, the main technical content has the following changes:
--- Added 3 items of "Scope", "Referenced Documents" and "Terms and Units of Measure";
--- Deleted the technical indicators of SLC9-1 current meter and the corresponding in-depth verification items;
--- Increased the determination method of positive and negative travel difference;
--- Improved the technical indicators and description of the verification tank;
--- Optimized flow rate verification point;
--- Deleted the retention period of the original data of the verification record form;
--- Added the information and format of the internal pages of the verification certificate and verification result notice:
The release of previous versions of this regulation:
--- JJG 628-1989:
Verification Regulation of SLC9 Direct Reading Current Meter
1 Scope
This regulation is applicable to the first verification, subsequent verification and subsequent verification of SLC9 direct reading current meter (hereinafter referred to as current meter)
Check in use:
2 Reference documents
This regulation refers to the following documents:
GB/T 21699-2008 Verification/Calibration Method of Rotor Flowmeter in Linear Open Groove
For dated references, only the dated versions are applicable to this Regulation; for those without dates
The latest version (including all amendments) is applicable to this regulation:
3 Terms and units of measurement
The unit of measurement of the velocity of the current meter is meters per second, the symbol is m/s; the flow direction is degrees, and the symbol is °:
4 Overview
The current meter is a propeller-type current meter, which is divided into two parts: a water receiver and an underwater detector:
The cable transmits signals, which can measure the horizontal velocity and direction of the water flow at the depth: The structure of the current meter is shown in Figure 1:
Figure 1 Structure chart of current meter
1-propeller; 2-socket; 3-hanger; 4-cable; 5-signal converter; 6-data terminal; 7-tail;
8-flow direction sensor; 9-O seal ring; 10-body; 11-flow rate sensor; 12-flow rate transmitter; 13-shroud
Related standard: JJG 695-2019    JJG 763-2019