GB/T 31890-2015 English PDF (GBT31890-2015)

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GB/T 31890-2015: Electronic screw weigher
GB/T 31890-2015
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”).
This standard also provides standardized requirements and test procedures for testing
the metrological or technical characteristics of screw weighers in a traceable manner.
This standard is applicable to the continuous accumulating automatic weighing
apparatus (electronic screw weighers) of the screw conveyor type, which works in a
continuous weighing method by using the principle of gravity, is used with single speed,
multi-speed, or variable-speed screw conveyors together, and can determine the flow
rate and cumulative mass of bulk materials.
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)
GB 755 Rotating electrical machines - Rating and performance (GB 755-2008, IEC
60034-1:2004, IDT)
GB/T 2423.1 Environmental testing - Part 2: Test methods - Tests A: Cold (GB/T
2423.1-2008, IEC 60068-2-1:2007, IDT)
GB/T 2423.2 Environmental testing - Part 2: Test methods - Tests B: Dry heat (GB/T
2423.2-2008, IEC 60068-2-2:2007, IDT)
GB 5226.1 Electrical safety of machinery - Electrical equipment of machines - Part
1: General requirements (GB 5226.1-2008, IEC 60204-1:2005, IDT)
GB/T 7551 Load cells
GB/T 7724 Electronic weighing meter
GB/T 13384 General specifications for packing of mechanical and electrical product
GB 14249.1 Safety requirements for electronic weighing instruments
GB/T 14250-2008 Terminology of weighing instruments
GB/T 17626.2 Electromagnetic compatibility - Testing and measurement techniques
- Electrostatic discharge immunity test (GB/T 17626.2-2006, IEC 61000-4-2:2001,
IDT)
GB/T 17626.3 Electromagnetic compatibility - Testing and measurement techniques
- Radiated, radio-frequency, electromagnetic field immunity test (GB/T 17626.3-
2006, IEC 61000-4-3:2002, IDT)
GB/T 17626.4 Electromagnetic compatibility - Testing and measurement techniques
- Electrical fast transient/burst immunity test (GB/T 17626.4-2008, IEC 61000-4-
4:2004, IDT)
GB/T 17626.5 Electromagnetic compatibility - Testing and measurement techniques
- Surge immunity test (GB/T 17626.5-2008, IEC 61000-4-5:2005, IDT)
GB/T 17626.6 Electromagnetic compatibility - Testing and measurement techniques
- Immunity to conducted disturbances, induced by radio-frequency fields (GB/T
17626.6-2008, IEC 61000-4-6:2006, IDT)
GB/T 17626.11 Electromagnetic compatibility - Testing and measurement
techniques - Voltage dips, short interruptions and voltage variations immunity tests
(GB/T 17626.11-2008, IEC 61000-4-11:2004, IDT)
GB 19517 National safety technical code for electric equipment
GB/T 26389-2011 Method of classified type of weighing instrument products
JB/T 5943 Construction machinery - General specifications for welding parts
JB/T 8828 Common specification for cutting
QB/T 1588.1 Light industry machinery - General specification for welding parts
3 Terms and definitions
The terms and definitions defined in GB/T 14250-2008 and the followings apply to this
document.
3.1 screw weigher
It is an automatic weighing instrument that continuously weighs bulk mate...