GB/T 24966-2023 PDF English
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| GB/T 24966-2023 | English | 260 |
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Grating vehicle detector
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| GB/T 24966-2010 | English | 399 |
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Vehicle separation grating
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GB/T 24966-2023: Grating vehicle detector---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT24966-2023
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 03.220.20
CCS R 84
Replacing GB/T 24966-2010, GB/T 24971-2010
Grating vehicle detector
Issued on: NOVEMBER 27, 2023
Implemented on: JUNE 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Composition, classification and model... 6
5 Technical requirements... 9
6 Test methods... 13
7 Inspection rules... 18
8 Marking, packaging, transportation and storage... 19
Grating vehicle detector
1 Scope
This document specifies the composition, classification and model, technical
requirements, test methods, inspection rules and marking, packaging, transportation and
storage of grating vehicle detectors.
This document applies to the production, use and inspection of grating vehicle detectors
at highway toll stations and overload detection lanes.
2 Normative references
The provisions of the following documents constitute the essential clauses of this
document through normative references in this text. Among them, for referenced
documents with dates, only the versions corresponding to the dates are applicable to
this document; for referenced documents without dates, the latest versions (including
all amendments) are applicable to this document.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 2423.1 Environmental testing - Part 2.Test methods - Tests A. Cold
GB/T 2423.2 Environmental testing - Part 2.Test methods - Tests B. Dry heat
GB/T 2423.3 Environmental testing - Part 2.Testing method - Test Cab. Damp heat,
steady state
GB/T 2423.10 Environmental testing - Part 2.Test methods - Test Fc. Vibration
(sinusoidal)
GB/T 2423.17 Environmental testing - Part 2.Test methods - Test Ka. Salt mist
GB/T 2423.22-2012 Environmental testing - Part 2.Tests methods - Test N.
Change of temperature
GB/T 4208-2017 Degrees of protection provided by enclosure (IP code)
GB/T 5080.7 Equipment reliability testing - Compliance test plans for failure rate
and mean time between failures assuming constant failure rate
GB/T 17626.2-2018 Electromagnetic compatibility - Testing and measurement
techniques - Electrostatic discharge immunity test
5 Technical requirements
5.1 Structure
5.1.1 The product structure shall be simple, firm, and easy to install and adjust.
5.1.2 The installed connectors shall be free from defects such as obvious deformation
and irregularity.
5.1.3 The communication interface and external connection shall be easy to install and
maintain, and waterproof and dustproof measures shall be taken.
5.2 Appearance quality
5.2.1 The outer shell of the grating vehicle detector shall not have pits, scratches,
deformations or cracks; the coating shall be smooth and uniform, with consistent color,
and shall not have defects such as blistering and cracking.
5.2.2 The nameplates, marks, texts, etc. on the body of the grating vehicle detector shall
be clear, firm, straight and not easy to fall off.
5.3 Functionality
5.3.1 The grating vehicle detector shall be capable of detecting one or more of the
following, including the vehicle separation, vehicle height, vehicle width, axle, tire type,
truck model and vehicle flow.
5.3.2 Type B grating vehicle detectors shall have an electric heating function to
effectively prevent condensation and frost.
5.3.3 The grating vehicle detector shall have the function of automatically detecting the
working status and fault detection, output alarm information when a fault occurs, and
the system shall automatically return to normal working status after the fault is
eliminated.
5.3.4 The data collected by the grating vehicle detector shall be able to be read in real
time by a portable terminal, and other maintenance operations and local management
shall be possible.
5.3.5 The communication interface of the grating vehicle detector shall use RS232,
RS485, RS422 serial ports or RJ-45 Ethernet interface.
5.3.6 The grating vehicle detector may have a network management function.
5.4 Vehicle detection performance
5.4.1 The relative error of vehicle separation detection shall not exceed 0.1%.
5.4.2 The measurement error of vehicle height detection shall not exceed 100 mm.
5.4.3 The measurement error of vehicle width detection shall not exceed 100 mm.
5.4.4 The relative error of axle detection shall not exceed 0.1%.
5.4.5 The relative error of tire type detection shall not exceed 2%.
5.4.6 The relative error of truck model detection shall not exceed 1%.
5.4.7 The relative error of vehicle flow detection shall not exceed 0.1%.
5.4.8 The minimum resolution dimension of the vehicle separation detection type shall
not exceed 50 mm.
5.4.9 The maximum effective detection distance between the transmitter and the
receiver shall not be less than 8 m.
5.4.10 The separation detection response time shall not exceed 50 ms.
5.5 Electrical safety performance
5.5.1 AC power supply type grating vehicle detector
5.5.1.1 Power adaptability
The product shall work reliably under the following input voltage conditions.
-- Voltage. AC 220 × (1±15%) V;
-- Frequency. 50 × (1±4%) Hz.
5.5.1.2 Insulation resistance
The insulation resistance between the power terminal and the casing of the product shall
be no less than 100 MΩ.
5.5.1.3 Dielectric strength
When applying a sinusoidal AC voltage of 50 Hz and effective value of 1500 V between
the power terminal and the casing of the product for 1 min, there shall be no spark,
flashover or breakdown.
5.5.1.4 Contact resistance
The product shall be equipped with a safety protection grounding terminal. The
In the power-on state, after scanning cycle vibration in the vibration frequency range of
2 Hz~150 Hz, the product shall function normally, the structure shall not be affected,
and there shall be no loose parts.
5.6.6 Salt spray corrosion resistance
The product's outer shell anti-corrosion layer, supporting base plate and aviation joints
shall have no obvious rust. Metal components shall have no red rust spots, and the anti-
reflective coating material shall not fall off.
5.6.7 Weather resistance
After artificial accelerated aging, the product's shell anti-corrosion layer, light-emitting
components and their supporting base plate shall show no obvious signs of aging.
5.6.8 Protection level
The product shall be rainproof and dustproof, and the protection level of the housing
and control box shall not be lower than IP65 specified in GB/T 4208-2017.
5.7 Electromagnetic compatibility
5.7.1 Electrical fast transient burst immunity
Under normal working conditions, the power port, signal and control port of the product
and the ground wire of the shell shall have the performance of resisting an electrical
fast transient/burst. After being interfered with by an electrical fast transient/burst, the
various actions, functions and operating logic of the product shall be normal.
5.7.2 Electrostatic discharge immunity
Under normal working conditions, the contact points, surfaces and maintenance points
of the product shall have immunity to electrostatic discharge. After electrostatic
discharge occurs, the various actions, functions and operating logic of the product shall
be normal.
5.7.3 Radiated electromagnetic field immunity
Under normal working conditions, the product shall have immunity to radiated
electromagnetic fields. After being exposed to a radiated electromagnetic field, the
various actions, functions and operating logic of the product shall be normal.
5.8 Reliability
The mean time between failures (MTBF) of the product shall be no less than 30,000
hours.
6 Test methods
6.1 Test conditions
The test is usually carried out under standard atmospheric conditions.
a) Ambient temperature. 15 ℃~35 ℃;
b) Relative humidity. 25%~75%;
c) Atmospheric pressure. 86 kPa~106 kPa.
6.2 Structure
Inspect the structure and mounting connections of the detector by visual inspection and
hand feel.
6.3 Appearance quality
Check the appearance quality of the detector by visual inspection and hand feel.
6.4 Functionality
6.4.1 Install the product as required, power it on, and after the system enters the normal
working state, the vehicle is driven at a speed not exceeding 20 km/h, and the
corresponding functions are verified according to the type of grating vehicle detector.
6.4.2 Simulate condensation and frosting in an environmental test chamber or other
specific environment. After turning on the heating function, observe whether the
condensation and frosting disappear.
6.4.3 According to the type of equipment failure, manually simulate various types of
failures to observe whether there is any fault alarm information output. After canceling
the simulated failure, observe whether the system automatically returns to the normal
working state.
6.4.4 Use a portable terminal to read the data collected by the grating vehicle detector
in real time and perform other maintenance operations to verify whether the function is
normal.
6.4.5 When using RS232, RS485, and RS422 serial ports or RJ-45 Ethernet interfaces
to transmit data, verify whether the data can be transmitted accurately and reliably.
6.4.6 Set the IP address for the device and verify whether network management such as
login, setting and collection can be performed.
enters the normal working state, the vehicle is driven at a speed not exceeding 20 km/h
for 1000 consecutive tests. The relative error of vehicle model detection is calculated
using the detection results of the grating vehicle detector and the results of human eye
recognition. The vehicle model test samples do not include specially modified vehicles
such as passenger-to-cargo conversions.
6.5.7 Relative error of vehicle flow detection
Connect and install the product as required, power it on, and run it. After the system
enters the normal working state, the vehicle is driven at a speed not exceeding 20 km/h,
and no less than 1000 vehicles are continuously detected. The relative error of vehicle
flow detection is calculated using the detection results of the grating vehicle detector
and the counting results of the counter or other counting methods.
6.5.8 Minimum resolution size
Use a spherical opaque standard part with a diameter of 50 mm, select any point at each
of the three height areas of high, medium and low that can be identified by the grating
vehicle detector, and let the standard part pass through the identification area in any
direction at these points.
6.5.9 Maximum working distance
When the working distance between the transmitter and the receiver or the detection
vehicle is set to 8 m, the system can still work normally.
6.5.10 Separation detection response time
Assemble the system and place it in a normal outdoor environment. Use an oscilloscope
to read the trigger and recognition time. Perform the test continuously for not less than
100 times and calculate the average value (T) as the test result.
6.6 Electrical safety performance
6.6.1 AC power supply type
6.6.1.1 Power adaptability
6.6.1.1.1 Use an autotransformer or adjustable AC power supply with a power
frequency of 50 Hz, and adjust the test voltage to 180 V, 200 V, 220 V, 240 V, 255 V,
230 V, 210 V, and 180 V in sequence. After each voltage is reached and stabilized, turn
on and off the power switch of the test product to check whether the logic and function
are normal.
6.6.1.1.2 Use variable frequency AC power supply with a constant voltage of 220 V,
and adjust the test frequency to 48 Hz, 49 Hz, 50 Hz, 51 Hz, and 52 Hz in sequence.
After each frequency is reached and stabilized, turn on and off the power switch of the
test product to check whether the logic and function are normal.
6.6.1.2 Insulation resistance
Use a 1.0 accuracy class, 500 V megohmmeter to measure between the power supply
terminal and the casing.
6.6.1.3 Dielectric strength
Use a withstand voltage tester with an accuracy class of 2.0 to test it between the wiring
terminals and the casing.
6.6.1.4 Grounding resistance
Use an ohmmeter with an accuracy class of 0.5 and a resolution of 0.01 Ω to measure
it between the metal part on the top of the casing and the safety protection grounding
terminal.
6.6.2 DC power supply type
6.6.2.1 DC input voltage
Use a DC power supply and adjust the test voltage to 90% and 110% of the rated input
voltage respectively. After each voltage stabilizes, turn on and off the power switch of
the test product respectively to check whether it works normally.
6.6.2.2 Lightning protection and overvoltage protection
Verify by inspection and, if necessary, by simulating overload or short-circuit fault
conditions.
6.7 Environmental adaptability
6.7.1 Low-temperature resistance
Carry out the test for 8 hours in accordance with the provisions of GB/T 2423.1.
6.7.2 High-temperature resistance
Carry out the test for 8 hours in accordance with the provisions of GB/T 2423.2.
6.7.3 Damp heat resistance
Carry out the test for 48 hours in accordance with the provisions of GB/T 2423.3.
6.7.4 Temperature alternation resistance
7.2 Batch grouping
Products are inspected in batches, and products produced from the same materials, same
processes and same production equipment are considered to be one batch.
7.3 Sampling
7.3.1 The sample for type inspection shall be a complete product randomly selected.
7.3.2 For products with a batch size of no more than 3 units, the factory inspection shall
be conducted by the quality inspection department of the product manufacturer on a
unit-by-unit basis. For products with a batch size of more than 3 units, the samples for
factory inspection shall be randomly selected from the end of the production line, not
less than 30% of the samples, but not less than 3 units.
7.4 Judgment rules
7.4.1 During the type inspection, if the electrical safety performance fails to meet the
standards, the type inspection result is considered to be FAIL. If other items fail to meet
the standards, double numbers of samples shall be taken from the same batch of
products to be inspected for the failed items. If the samples still fail to meet the
standards, the type inspection result is considered to be FAIL.
7.4.2 When samples are inspected one by one before leaving the factory, certificates of
conformity are issued after they pass the inspection, and then they can leave the factory.
When no less than 30% of the samples are taken for factory inspection, if all the samples
are qualified, the entire inspection batch is qualified, certificates of conformity are
issued and the products are allowed to leave the factory; if one unit fails, the entire batch
shall be inspected one by one to eliminate the unqualified products.
7.4.3 During the factory inspection, rejected defective products are allowed to be
repaired. After the repair, the defective items shall be re-inspected, but the number of
repairs shall not exceed 2 times.
8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 Product marking
Product marks can be in the form of nameplates or direct spraying, printing, etc. The
marking shall be clear, easy to identify and not easy to fade or fall off due to changes
in the natural environment. The following shall be indicated on the product mark.
a) Name, address and trademark of the manufacturer;
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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