GB/T 21296.5-2020 PDF English

GB/T21296.5-2020 (GBT21296.5-2020): PDF in English

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 7.2~7.8 and the requirements of Clauses 7 and 8 in GB/T 21296.1-2020. 7.2 Road survey, site selection and layout 7.2.1 Road survey and site selection The quartz dynamic vehicle weighing instrument shall be installed on the road section where the vehicle travels in a straight line. If there is a curve, the length of the straight section shall not be less than 64 m. The installation position of crystal quartz load receptor/sensor is selected near the length of 3/4 of the weigh zone of the straight section. It shall meet the requirements of Table 10, Table 11, Table 12, and Table 13 in GB/T 21296.1-2020. 7.2.2 Layout The accuracy of quartz dynamic vehicle weighing instruments is related to the crystal quartz sensor’s performance, number of rows, layout method, road conditions (such as road surface smoothness), and quality of buried installation. According to the application requirements, the manufacturer shall select and decide the combination method and installation quality requirements. The layout of some typical applications is shown in Figure 1. Place the sensor to its installation position. Before the installed potting compound is completely solidified, the sensor shall not be moved. No vehicles shall pass or roll over it. 7.6 Grinding After the potting compound particles are completely cured, the overflowed and cured compound is removed by grinding, to ensure that the top of the sensor bearing surface is flush with the road surface. Flatness requirements: After the crystal quartz sensor is installed, the sensor and the road surface form an organic whole; that is, the crystal quartz sensor has become an integral part of the road. The flatness of the road including the sensor shall meet the requirements of Table 10, Table 11, Table 12, and Table 13 in GB/T 21296.1-2020. 7.7 Control cabinet waterproofing and grounding The control cabinet is equipped with power supply and electronic weighing meter. The grounding resistance shall be less than 4 Ω. There shall be measures to prevent rain. It shall meet the requirements of GB/T 15395. When the basic steel bar is used as the grounding electrode of the weighing system, the grounding resistance should be less than 4 Ω. 7.8 Maintenance During the operation and use of the equipment, the user shall conduct regular and irregular inspections and necessary maintenance, including: a) Check and clean, to ensure that there are no falling objects such as stones, bolts and nuts in the controlled we.......
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