WIM Accuracy Grades in OIML R134-1 vs Chinese National Standard
Comparative Analysis of Accuracy Grades in Dynamic Weighing (WIM): OIML R134-1 vs. GB/T 21296.1-2020
Introduction
OIML R134-1 and GB/T 21296.1-2020 are both
standards that provide specifications for dynamic weighing systems (WIM) used
for highway vehicles. OIML R134-1 is an international standard issued by the
International Organization of Legal Metrology, applicable globally. It sets out
requirements for WIM systems in terms of accuracy grades, permissible errors,
and other technical specifications. GB/T 21296.1-2020, on the other hand, is a
Chinese national standard that offers comprehensive technical guidelines and accuracy
requirements specific to the Chinese context. This article aims to compare the
accuracy grade requirements of these two standards to determine which one
imposes stricter accuracy demands for WIM systems.
1.
Accuracy Grades in OIML
R134-1
Vehicle Weight:
- Six accuracy grades: 0.2, 0.5, 1, 2, 5, 10
Single Axle Load and Axle Group Load:
- Six accuracy grades: A, B, C, D, E, F
1.2 Maximum Permissible Error (MPE)
Vehicle Weight (Dynamic Weighing):
- Initial verification: 0.10% - 5.00%
- In-service inspection: 0.20% - 10.00%
Single Axle Load and Axle Group Load
(Two-axle Rigid Reference Vehicles):
- Initial verification: 0.25% - 4.00%
- In-service inspection: 0.50% - 8.00%
1.3 Scale Interval (d)
- The scale intervals vary from 5 kg to 200 kg, with the number
of intervals ranging from 500 to 5000.
2. Accuracy Grades in GB/T 21296.1-2020
Basic Accuracy Grades for Vehicle Gross
Weight:
- Six accuracy grades: 0.2, 0.5, 1, 2, 5, 10
Basic Accuracy Grades for Single Axle
Load and Axle Group Load:
- Six accuracy grades: A, B, C, D, E, F
Additional Accuracy Grades:
- Vehicle gross weight: 7, 15
- Single axle load and axle group load: G, H
2.2 Maximum Permissible Error (MPE)
Vehicle Gross Weight (Dynamic Weighing):
- Initial verification: ±0.5d - ±1.5d
- In-service inspection: ±1.0d - ±3.0d
Single Axle Load and Axle Group Load
(Two-axle Rigid Reference Vehicles):
- Initial verification: ±0.25% - ±4.00%
- In-service inspection: ±0.50% - ±8.00%
2.3 Scale Interval (d)
- The scale intervals vary from 5 kg to 200 kg, with the number
of intervals ranging from 500 to 5000.
- The minimum scale intervals for vehicle gross weight and
partial weighing are 50 kg and 5 kg, respectively.
3. Comparative Analysis of Both
Standards
3.1 Types of Accuracy Grades
- OIML R134-1: Primarily focuses on
basic accuracy grades.
- GB/T 21296.1-2020: Includes both
basic and additional accuracy grades, making the classification more
detailed and refined.
3.2 Maximum Permissible Error (MPE)
- OIML R134-1: The range of maximum
permissible error for vehicle gross weight is broader.
- GB/T 21296.1-2020: Provides more
specific maximum permissible error for dynamic weighing and stricter
requirements for scale intervals.
3.3 Scale Interval and Minimum Weighing
- OIML R134-1: Provides a broad range
of scale intervals and minimum weighing requirements.
- GB/T 21296.1-2020: Covers the
requirements of OIML R134-1 and further specifies the minimum weighing
requirements.
Conclusion
By comparison, GB/T 21296.1-2020 is
more stringent and detailed in its accuracy grades, maximum permissible error,
scale intervals, and minimum weighing requirements. Therefore, GB/T
21296.1-2020 imposes more rigorous and specific accuracy requirements for
dynamic weighing (WIM) than OIML R134-1.
Enviko Technology Co.,Ltd
E-mail: info@enviko-tech.com
https://www.envikotech.com
Chengdu Office: No. 2004, Unit 1, Building 2, No. 158, Tianfu 4th Street, Hi-tech Zone, Chengdu
Hong Kong Office: 8F, Cheung Wang Building, 251 San Wui Street, Hong Kong
Comments
Post a Comment