GB/T 31890-2015 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 31890-2015 | English | 500 |
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GB/T 31890-2015: Electronic screw weigher---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/GBT31890-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.100
N 13
Electronic screw weigher
(OIML R50-1.1997E, MOD)
Issued on. SEPTEMBER 11, 2015
Implemented on. APRIL 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of PRC.
Table of Contents
Foreword... 4
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Product model... 8
5 Metrological requirements... 8
5.1 Accuracy classes... 8
5.2 Maximum allowable errors... 8
5.3 Minimum totalized load (Σmin)... 10
5.4 Minimum flow rate... 10
5.5 Units of measurement... 10
5.6 Simulation test... 10
5.7 Field test... 13
5.8 Exit-factory test... 14
6 Technical requirements... 14
6.1 Technical requirements for the structure... 14
6.2 Safety of operation... 15
6.3 Totalization indicating and printing devices... 16
6.4 Out-of-range indication... 16
6.5 Zero-setting device... 16
6.6 Overload protection... 17
6.7 Auxiliary equipment... 17
6.8 Sealing device... 17
6.9 Load cells... 17
6.10 Speed/displacement detection device... 17
6.11 POST Procedure... 18
6.12 Interference... 18
6.13 Warm-up time... 18
6.14 Interface... 18
6.15 Alternating current power supply (AC)... 18
6.16 Battery supply (DC)... 18
6.17 Safety performance... 19
7 Test methods... 19
7.1 Appearance inspection... 19
7.2 General requirements for testing... 19
7.3 Simulation test... 20
7.4 On-site overall test... 31
7.5 Exit-factory inspection... 36
7.6 Safety performance test... 37
8 Inspection rules... 37
8.1 Type inspection... 37
8.2 Initial inspection, in-service inspection... 38
8.3 Exit-factory inspection... 38
9 Marking, packaging, transportation, and storage... 39
9.1 Nameplate... 39
9.2 Packaging... 40
9.3 Transportation... 40
9.4 Storage... 40
Appendix A (Informative) Comparison between the clauses of this standard and OIML
R50-1 (1997E)... 42
Appendix B (Informative) Technical differences between this standard and OIML R50-
1 (1997E) and their reasons... 44
References... 48
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is redrafted and modified in relation to the International Recommendation
of OIML R50-1 “Continuous totalizing automatic weighing instruments (belt weighers)
- Part 1.Metrological and technical requirements - Tests” (1997E).
Since the current management mode of measuring products in China is different from
the international ones, this standard has more adjustments in structure compared with
R50 International Recommendations. For the convenience of comparison, a
comparative list of the clauses of this standard to the clauses of International
Recommendation is given in informative appendix A.
Due to the legal requirements of China and the special needs of the industry, this
standard has been modified when international recommendations are adopted. These
technical differences are indicated by a single vertical line in the margin of the clause
to which they refer. A list of technical differences and their reasons is given in Appendix
B for reference.
This standard is proposed by China National Light Industry Council.
This standard shall be under the jurisdiction of China Weighing Instrument
Standardization Technical Committee (SAC/TC97).
Drafting organizations of this standard. Saimo Electric Co., Ltd., Jiangsu Institute of
Metrology, Nanjing San’ai Industrial Control Co., Ltd., Tongling City SSS Electronics
Co., Ltd.
The main drafters of this standard. Li Da, He Fusheng, Hu Qiang, Lu Qinsheng, Xu
Housheng.
Electronic screw weigher
1 Scope
This standard specifies the terms, product models, requirements, test methods,
inspection rules, marking, packaging, transportation, and storage of electronic screw
weighers (also known as screw reamer scales, screw feeder scales, hereinafter referred
to as “screw weighers”).
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 191 Packaging - Pictorial marking for handling of goods (GB/T 191-2008,
ISO 780.1997, MOD)
3 Terms and definitions
The terms and definitions defined in GB/T 14250-2008 and the followings apply to this
document.
The intrinsic error of a screw weigher that is determined before the performance test
and durability test.
4 Product model
It shall be compiled according to GB/T 26389-2011.
5 Metrological requirements
In the temperature range of -10 °C~+40 °C, the screw weigher shall meet the
corresponding metrological requirements and technical requirements.
6 Technical requirements
For a screw weigher, there shall be no accidental failure or control component
maladjustment that is not obvious and may interfere with the metrological performance
and normal function of the screw weigher.
7 Test methods
It shall be kept free of moisture condensation on the weighing unit of the screw weigher
under test.
The electrostatic discharge test shall be carried out according to GB/T 17626.2, and the
test level shall be level 3.
8 Inspection rules
For type inspection, 1 test prototype shall be randomly selected from the qualified
products, and the sampling base shall not be less than 3.
The initial inspection of a screw weigher shall be carried out after the on-site installation
is completed, and the in-service inspection shall be carried out regularly according to
its use requirements.
9 Marking, packaging, transportation, and storage
Under normal conditions of use, descriptive signs shall be firm and reliable, have a
uniform size and shape, and be clear and legible.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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