GB/T 21296.1-2020 English PDF (GB/T21296.1-2020)

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GB/T 21296.1-2020: Automatic instruments for weighing road vehicles in motion -- Part 1: General technical specification
GB/T 21296.1-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.100
N 13
Replacing GB/T 21296-2007
Automatic Instruments for Weighing Road Vehicles in
Motion - Part 1: General Technical Specification
(OIML R134:2006, Automatic Instruments for Weighing Road Vehicles in Motion and
Measuring Axle Loads, NEQ)
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 5 
1 Scope ... 7 
2 Normative References ... 7 
3 Terms and Definitions ... 8 
3.1 General Definitions ... 8 
3.2 Structure ... 10 
3.3 Metrological Characteristics ... 13 
3.4 Indications and Errors ... 18 
3.5 Tests ... 20 
3.6 Vehicles ... 20 
3.7 Typical Products and Systems ... 21 
3.8 Influence and Reference Conditions ... 23 
4 Classification ... 23 
4.1 Classification Rules ... 23 
4.2 LS-WIM Weighing Instrument ... 24 
4.3 MS-WIM Weighing Instrument ... 24 
4.4 HS-WIM Weighing Instrument... 24 
4.5 Types of WIM Weighing Instruments ... 24 
4.6 Naming Rules of WIM Weighing Instruments ... 25 
5 Measurement Requirements ... 25 
5.1 Basic Accuracy Levels ... 25 
5.2 Additional Accuracy Levels ... 26 
5.3 Relations among Accuracy Levels ... 26 
5.4 Maximum Tolerances for In-motion Test ... 27 
5.5 Maximum Permissible Errors for Static Test ... 30 
5.6 Scale Interval (d) ... 30 
5.7 Minimum Capacity (Min) ... 32 
5.8 Consistency between Indicating Devices and Printing Devices ... 32 
5.9 Influence Quantities ... 32 
5.10 Unit of Measurement Results ... 34 
5.11 Scale Interval of Static Weighing ... 34 
5.12 Operating Speed ... 34 
6 General Technical Requirements ... 34 
6.1 Applicability ... 34 
6.2 Load Receptor ... 35 
6.3 Operational Safety ... 35 
6.4 Requirements for Electronic Weighing Instruments ... 36 
6.5 Speed Measurement ... 36 
6.6 Zero-setting Device ... 37 
6.7 Data Output and Software ... 37 
6.8 Lead Sealing or Print Sealing Device ... 40 
7 Production and Installation Requirements ... 41 
7.1 Overview ... 41 
7.2 Load Receptor ... 41 
7.3 Output Time of Weighing Results ... 42 
7.4 Sensor Protection Degree ... 42 
7.5 Prevention from Dust Accumulation ... 43 
7.6 Water Drainage ... 43 
7.7 Heating ... 43 
8 General Requirements for Installation Conditions and Maintenance ... 43 
8.1 General Requirements ... 43 
8.2 Conditions of Installation Site ... 43 
8.3 Equipment Maintenance and Management ... 47 
9 WIM System Functions and Data Requirements ... 49 
9.1 General Requirements ... 49 
9.2 Requirements for Basic Functions ... 49 
9.3 Requirements for Additional Functions ... 50 
9.4 Storage, Processing and Transmission of WIM System Data ... 52 
10 Test Methods ... 53 
10.1 General Rules ... 53 
10.2 Preparation before Test ... 53 
10.3 Static Weighing Test ... 53 
10.4 In-motion Weighing Test ... 54 
11 Inspection Rules ... 62 
11.1 Type Test ... 62 
11.2 Exit-factory Inspection ... 62 
11.3 Inspection of First Installation ... 63 
11.4 In-use Inspection ... 63 
12 Marking, Packaging, Transportation and Storage ... 63 
12.1 Marking... 63 
12.2 Packaging ... 65 
12.3 Transportation ... 66 
12.4 Storage ... 66 
Appendix A (normative) Requirements and Test Methods of Electronic Weighing
Instruments ... 67 
Appendix B (informative) Model Code ... 84 
Appendix C (informative) Communication Protocol between Weighing Equipment and
On-site Acquisition Computer or Upper Computer ... 87 
Appendix D (normative) Technical Requirements and Test Methods of Integrated
Control Instrument ... 96 
Appendix E (normative) Requirements for Module Test ... 100 
Bibliography ... 101 
Automatic Instruments for Weighing Road Vehicles in
Motion - Part 1: General Technical Specification
1 Scope
This Part of GB/T 21296 specifies the terms and definitions, classification and naming,
measurement requirements, general technical requirements, production and installation
requirements, general requirements for installation conditions and maintenance, WIM system
functions and data requirements, test methods, inspection rules, as well as the requirements for
marking, packaging, transportation and storage of automatic instruments for weighing road
vehicles in motion (hereinafter referred to as: WIM weighing instruments).
This Part applies to the legally relevant applications and general applications of WIM weighing
instruments.
This Part applies to WIM weighing instruments or systems that are installed in the controlled
weighing area and adopt the principle of gravity to obtain the axle load (which can be directly
measured, or obtained by accumulating the separately measured wheel loads), axle-group load
and curb weight of road vehicles, regardless of the specific product structure and technical
implementation mode. WIM weighing instruments without the controlled weighing area may
take this Part as a reference.
This Part does not apply to weighing instruments or measuring systems, in which, there is no
relative movement of the load receptor or measuring device and the vehicle in the horizontal
driving direction during measurement, such as: static wheel load gauge and load measuring
device embedded in vehicle components, etc.
This Part does not apply to weighing instruments or measuring systems that cannot guarantee
that all tyres of the test vehicle and the upper surface of the load receptor are approximately on
the same plane during measurement (for example, products and systems that simply place the
load receptor on the road surface).
This Part does not apply to weighing instruments that merely measure the wheel load on one
side, and then, obtain the axle load, axle-group load and curb weight by multiplying.
2 Normative References
The following documents are indispensable to the application of this document. In terms of
references with a specified date, only versions with a specified date are applicable to this
document. In terms of references without a specified date, the latest version (including all the
modifications) is applicable to this document.
GB/T 191 Packaging - Pictorial Marking for Handling of Goods
GB/T 2423.3 Environmental Testing - Part 2: Testing Method - Test Cab: Damp Heat, Steady
State
GB/T 13384 General Specifications for Packing of Mechanical and Electrical Product
GB/T 14250 Terminology of Weighing Instruments
GB/T 17626.2 Electromagnetic Compatibility - Testing and Measurement Techniques -
Electrostatic Discharge Immunity Test
GB/T 17626.3 Electromagnetic Compatibility - Testing and Measurement Techniques -
Radiated, Radio-frequency, Electromagnetic Field Immunity Test
GB/T 17626.4 Electromagnetic Compatibility - Testing and Measurement Techniques -
Electrical Fast Transient / Burst Immunity Test
GB/T 17626.5 Electromagnetic Compatibility - Testing and Measurement Techniques - Surge
Immunity Test
GB/T 17626.6 Electromagnetic Compatibility - Testing and Measurement Techniques -
Immunity to Conducted Disturbances, Induced by Radio-frequency Fields
GB/T 17626.11 Electromagnetic Compatibility - Testing and Measurement Techniques -
Voltage Dips, Short Interruptions and Voltage Variations Immunity Tests
GB/T 26389 Method of Classified Type of Weighing Instrument Products
ISO 7637-2 Road Vehicles - El...