GB/T 21296.5-2020 English PDF (GBT21296.5-2020)

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GB/T 21296.5-2020: Automatic instruments for weighing road vehicles in motion -- Part 5: Crystal quartz type
GB/T 21296.5-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.100
N 13
Automatic instruments for weighing road vehicles in motion
- Part 5: Crystal quartz type
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Type and composition ... 8 
5 Measurement requirements ... 8 
6 Technical requirements ... 13 
7 Installation and maintenance requirements ... 16 
8 System function and data requirements ... 19 
9 Test methods ... 19 
10 Inspection rules ... 27 
11 Marking, packaging, transportation, and storage ... 29 
Appendix A (Normative) Additional accuracy classes ... 30 
Appendix B (Normative) Test method of crystal quartz load receptor-signal assemble
module ... 34 
Automatic instruments for weighing road vehicles in motion
- Part 5: Crystal quartz type
1 Scope
This Part of GB/T 21296 specifies the terms and definitions, type and composition,
measurement requirements, technical requirements, installation and maintenance
requirements, system function and data requirements, test methods, inspection rules, as
well as marking, packaging, transportation, and storage of crystal quartz automatic
instruments for weighing road vehicles in motion (hereinafter referred to as quartz
dynamic vehicle weighing instruments).
This Part applies to the combination of single or multiple crystal quartz sensors installed
in the controlled weighing area in a way of embedding in the road surface during the
dynamic driving of road vehicles; automatic instruments for weighing vehicles in
motion that measure and obtain the vehicle wheel loads (if applicable), axle loads
(including single-axle loads) and whole loads.
2 Normative references
The following documents are indispensable for the application of this document. For
the dated references, only the editions with the dates indicated are applicable to this
document. For the undated references, the latest edition (including all the amendments)
are applicable to this document.
GB/T 7724 Electronic weighing meter
GB/T 14250 Terminology of weighing instruments
GB/T 15395 General technical specification for cabinet of electronic equipment
GB/T 21296.1-2020 Automatic instruments for weighing road vehicles in motion -
Part 1: General technical specification
GB/T 26389 Method of classified type of weighing instrument products
JJG 338 Verification Regulation of Charge Amplifiers
3 Terms and definitions
The terms and definitions defined in GB/T 14250 and GB/T 21296.1-2020 and the
value is between 0.85 times the lower limit of nominal voltage and 1.1 times the
upper limit;
b) Weighing instruments using direct current (DC) online power supply (including
rechargeable batteries that can be fully charged when the instrument is working):
The voltage value is within the range from the specified minimum voltage to 1.2
times the nominal voltage (or the upper limit of working voltage range);
Note: The lowest voltage refers to the lowest voltage value at which the weighing instrument
can operate normally before automatic shutdown.
c) Weighing instruments powered by batteries (including non-rechargeable batteries
or rechargeable batteries that cannot be charged online): The voltage value is
within the range from the specified minimum voltage to the nominal voltage (or
the upper limit of working voltage range);
d) Weighing instruments powered by 12 V automobile battery: 9 V~16 V;
e) Weighing instruments powered by 24 V automobile battery: 16 V~24 V.
5.8 Unit of measurement
The unit of measurement of mass and load of crystal quartz dynamic vehicle weighing
instruments is kilogram (kg) or ton (t).
5.9 Operating speed
Within the nominal operating speed range, crystal quartz dynamic vehicle weighing
instruments shall maintain the corresponding metering performance requirements and
technical requirements. When it exceeds the operating speed range, no result will be
output. Or according to the requirements of 9.3.8 in GB/T 21296.1-2020, a violation
prompt will be given.
This operating speed range can be adjusted or determined according to the test
situations during the field weighing test.
6 Technical requirements
6.1 Overview
Quartz dynamic vehicle weighing instruments shall meet the requirements of 6.2~6.8
and the provisions of Clause 6 in GB/T 21296.1-2020.
6.2 General technical requirements
Quartz dynamic vehicle weighing instruments shall be designed and manufactured to
6.3.3 Insulation resistance
The impedance of crystal quartz sensor shall not be lower than 100 GΩ.
6.3.4 Anti-corrosion requirements
Crystal quartz sensors shall be effectively protected against corrosion and rust.
If a cladding or coating layer is designed on the surface, the cladding and coating layer
shall be smooth and intact. The coating shall have high adhesion strength; shall be firm,
uniform, and consistent in color. There shall be no defects such as spots and scratches.
6.3.5 Metal frame strength
The strength of metal frame shall meet the stability and reliability requirements of long-
term continuous operation.
6.4 General technical requirements for charge amplifier
The electrical parameters and degree of protection of charge amplifier shall meet the
requirements of the design and application of quartz dynamic vehicle weighing
instruments. If necessary, according to the test method of JJG 338, test and detect its
parameters such as nonlinear error, high-low pass cutoff frequency.
6.5 General technical requirements for weighing meter
The electrical parameters and degree of protection of weighing meter shall meet the
requirements of the design and application of quartz dynamic vehicle weighing
instruments; and comply with the relevant provisions of GB/T 7724.
6.6 Vehicle identification device
Quartz dynamic vehicle weighing instruments shall be equipped with vehicle
identification devices, such as ground-sensing coil vehicle detector, infrared light
curtain (grating), laser vehicle separator, etc. The devices shall be able to detect whether
the vehicle is in the weigh zone.
6.7 Interface
Quartz dynamic vehicle weighing instruments can be equipped with interfaces to
connect external equipment. When using the interface, the weighing instrument shall
keep working normally and without error. And it can be ensured that the metering
performance is not affected. External equipment generally includes: ground-sensing
coil vehicle detector, infrared light curtain (grating), road gate, red-green indicator light,
vehicle separator, camera, voice control equipment, computer, etc.
6.8 Anti-interference performance
It shall comply with the provisions of A.1.2 and A.4.2 in Appendix A of GB/T 21296.1-
2020.
7 Installation and maintenance requirements
7.1 Overview
The realization of the accuracy class of quartz dynamic vehicle weighing instruments
is not only related to the design, production and installation of the weighing instrument
itself; but also related to the levelness, slope, curvature, road strength and other
conditions of the weigh zone; and is related to the daily maintenance of the weighing
instrument. Users shall have a correct understanding of this.
Quartz dynamic vehicle weighing instruments shall meet the requirements of 7.2~...