Standard No.:	GB/T 27738-2011
English Name:	Automatic gravimetric filling instruments
Chinese Name:	重力式自动装料衡器
Chinese Classification:	A53    Mechanics Measurement
Professional Classification:	GB    National Standard
Issued by:	AQSIQ,SAC
Issued on:	2011-12-30
Implemented on:	2012-7-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	30000 words
Price(USD):	600.0
Delivery:	via email in 1 business day

1 Scope This Standard specifies the terms and definitions, product model, metrological requirements, test methods, inspection rules as well as marking, packaging, transportation and storage of automatic gravimetric filling instruments. This Standard also provides standardized requirements, test procedures and tables for tracing-type evaluation on metrological or technical characteristics of automatic gravimetric filling instruments. This Standard is applicable to such automatic gravimetric filling instruments (hereinafter referred to as "filling instruments") that one or more loads of filling makes up predetermined mass via automatic weighing. This Standard places no constraint on the maximum capacity or minimum capacity of filling instruments. In addition, filling instruments also may be required to comply with certain requirements of other national standards. For example, where filling instruments adopt non-automatic modes under normal conditions, they shall meet requirements of relevant standards regarding non-automatic weighing instruments; where the fill is less than or equal to 25kg, they shall meet the requirements of relevant standards regarding quantity of product in prepackages. 2 Normative References The following documents are indispensable for the application of this Standard. For dated references, only the dated edition applies. For undated references, the latest edition applies. GB/T 191 Packaging - Pictorial Marking for Handling of Goods (GB/T 191-2008, ISO 780: 1997, MOD) GB/T 2887 Specification for Electronic Computer Field GB/T 4879 Rustproof Packaging GB/T 5048 Moistureproof Packaging 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/T 2423.3 Environmental Testing for Electric and Electronic Products - Part 2: Testing Method - Test Cab: Damp Heat Steady State (GB/T 2423.3-2006, IEC 60068-2-78: 2001, IDT) GB/T 2424.1 Environmental Testing for Electric and Electronic Products - Guidance for High Temperature and Low Temperature Tests (GB/T 2424.1-2005, IEC 60068-3-1: 1974, IDT) GB/T 2424.2 Environmental Testing for Electric and Electronic Products - Guidance for Damp Heat Tests (GB/T 2424.2-2005, IEC 60068-3-4: 2001, IDT) GB/T 7551 Load Cells (GB/T 7551-2008, OIML R60: 2000, MOD) GB/T 7724 Electronic Weighing Meter GB/T 13384 General Specifications for Packing of Mechanical and Electrical Product GB/T 15395 General Technical Specification for Cabinet of Electronic Equipment GB 14249.1 Safety Requirements for Electronic Weighing Instruments GB/T 14250 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(impact) 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) QB 1563 Methods of Classifying Type of Weighing Instruments QB/T 1588.1 Light Industry Machinery General Technical Specifications for Weldments QB/T 1588.2 Light Industry Machinery General Technical Conditions for Cutting Workpieces QB/T 1588.3 Light Industry Machinery General Technical Specifications for Assemblies QB/T 1588.4 Light Industry Machinery General Technical Specifications for Painting JJG 99 Verification Regulation of Weights 3 Terms and Definitions For the purposes of this Standard, the terms and definitions established in GB/T 14250 and those listed below apply. For convenience of application, some terms and definitions in GB/T 14250 are repeatedly listed as follows.

Foreword I 1 Scope 2 Normative References 3 Terms and Definitions 3.1 General Definitions 3.2 Construction 3.3 Metrological Characteristics 3.4 Indications and Errors 3.5 Influence Quantity and Reference Conditions 3.6 Tests 3.7 Control of Measuring Instruments 4 Product Model 5 Metrological Requirements 5.1 Accuracy Classes 5.2 Limits of Error 5.3 Particle Mass Correction (See 3.3.2) 5.4 Maximum Permissible Preset Value Error (MPSE) 5.5 Maximum Permissible Error (MPE) for Influence Factor Tests 5.6 Minimum Capacity (Min) 5.7 Rated Minimum Fill (Minfill) 5.8 Influence Factors 5.9 Units of Measurement 6 Technical Requirements 6.1 Suitability for Use 6.2 Security of Operation 6.3 Indication of Weighing Results 6.4 Fill Setting Device 6.5 Final Feed Cut-Off Device 6.6 Feeding Device 6.7 Load Receptor 6.8 Zero-setting and Tare Devices 6.9 Equilibrium Mechanism 6.10 Control Weigher 6.11 Software 7 Requirements for Electronic Instruments 7.1 General Requirements for Electronic Instruments 7.2 Performance requirements of electronic instruments 7.3 Inspection and Tests 7.4 Safety Performance 7.5 Load Cells 7.6 Manufacturing 7.7 Installation 8 Test Methods 8.1 Determination of the Mass of Individual Fills 8.2 Conduct of Material Tests 8.3 Number of Fills 8.4 Accuracy of Standard Instruments 8.5 Material Test Methods 8.6 Preset Value 8.7 Mass and Average of the Test Fills 8.8 Deviation for Automatic Weighing 8.9 Preset Value Error for Automatic Weighing 9 Inspection Rules 9.1 Pattern Evaluation 9.2 Pattern Evaluation Requirements 9.3 End-of-manufacturing Inspection 10 Marking, Packaging, Transportation and Storage 10.1 Declarative Markings 10.2 Verification Marks 10.3 Packaging Marks 10.4 Packaging 10.5 Transportation 10.6 Storage Appendix A (Normative) Test Methods for Automatic Gravimetric Filling Instruments A.1 Inspection for Pattern Evaluation A.2 Examination for End-of-manufacturing Inspection A.3 General Test Requirements A.4 Test Program A.5 Static Tests A.6 Influence Factor and Disturbance Tests A.7 Span Stability Test (7.3.3) A.8 Procedure for Material Tests Appendix B (Normative) Pattern Evaluation Report Format of Automatic Gravimetric Filling Instruments B.1 Instructions for Pattern Evaluation Report Format B.2 Identifications of Weighing Instruments B.3 Basic Information on the Pattern B.4 Test Equipment for Pattern Evaluation B.5 Test Set-up B.6 Requirements for Notes in Pattern Evaluation Report B.7 Pattern Evaluation Summary B.8 Checklist Appendix C (Informative) Comparison Schedule between Clauses in This Standard and OIML R61(2004E) Appendix D (Informative) Technical Differences between Clauses in this Standard and OIML R61(2004E) and Their Reasons