Standard No.:	GB/T 7551-2008
English Name:	cells
Chinese Name:	称重传感器
Chinese Classification:	N13    Mechanical quantity instrument, automatic weighing equipment and other measuring instrument
Professional Classification:	GB    National Standard
Issued by:	AQSIQ; SAC
Issued on:	2008-6-30
Implemented on:	2009-1-1
Status:	valid
Superseding:	GB/T 7551-1997 Load cells
Language:	English
File Format:	PDF
Word Count:	19000 words
Price(USD):	470.0
Delivery:	via email in 1 business day

Scope This Standard specifies terms and definitions, product types, basic parameter and classification, technical requirements, testing methods, inspection rules, marking, packing, transportation and storage of load cell used for quality measurement. This Standard is applicable to measure load cell with static quality. For the instruments that are used with load cell and display quality, their technical requirements are specified by other relevant standards. 2 Normative References The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. For dated reference, subsequent amendments to (excluding corrigendum) or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this Standard are encouraged to study whether the latest editions of these documents apply. For undated reference, the latest edition of the normative documents referred to applies. GB/T 191 Packaging-Pictorial Marking for Handling of Goods (GB/T 191 - 2008; ISO 780: 1997,MOD) GB/T 2423.3 Environmental Testing for Electric and Electronic Products Part 2: Testing Method Test Ca: Damp Heat Steady State (GB/T 2423.3 - 2006, IEC 60068-2-78:2001, IDT) GB/T 2423.4-1993 Basic Environmental Testing Procedures for Electric and Electronic Products-Test Db:Damp Heat, Cyclic (eqv IEC 60068-2-30:1980) 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 15464 General-purpose Specification for the Packaging of Instrumentation Products GB/T 17626.2-2006 Electromagnetic Compatibility(EMC-Testing and Measurement Techniques-Electrostatic Discharge Immunity Test (IEC 61000-4-2: 2001, IDT) GB/T 17626.3-2006 Electromagnetic Compatibility-Testing and Measurement Techniques- Radiated Radio-frequency Electromagnetic Field Immunity Test (IEC 61000-4-3: 2002, IDT) GB/T 17626.4-1998 Electromagnetic Compatibility-Testing and Measurement Techniques-Electrical Fast Transient/Burst Immunity Test (idt IEC 61000-4-4:1995) GB/T 17626.5-1999 Electromagnetic Compatibility-Testing and Measurement Techniques-Surge Immunity Test (idt IEC 61000-4-5: 1995) GB/T 17626.6-1998 Electromagnetic Compatibility-Testing and Measurement Techniques-Immunity to Conducted Disturbances, Induced by Radio-frequency Fields (idt IEC 61000-4-6: 1996) GB/T 17626.11-1999 Electromagnetic Compatibility- Testing and Measurement Techniques-Immunity Test of Voltage Dip, Short Interruption and Voltage Variation (idt IEC 61000-4-11:1994) JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement 3 Terms and Definitions For the purposes of this Standard, the following terms and definitions apply. 3.1 General Terms 3.1.1 Application of load 3.1.1.1 Compression loading Compressive force applied to a load cell. 3.1.1.2 Tension loading Tension force applied to a load cell.。 3.1.2 Load cell Force transducer which, after taking into account the effects of the acceleration of gravity and air buoyancy at the location of its use, measures mass by converting the measurand quantity (mass) into another measured quantity (output). 3.1.3 Load cell equipped with electronics Load cell employing an electronic components having a recognizable function of its own. Examples of electronics: p-n junction, amplifier, encoder, A/D converter, CPU, I/O interface, etc. (not including strain gauge bridge circuits). 3.1.3.1

Contents Foreword I 1 Scope 2 Normative References 3 Terms and Definitions 3.1 General Terms 3.2 Metrological Characteristics of Load Cell 3.3 Range, Capacity and Output Terms 3.4 Measurement and Error Terms 3.5 Influences and Reference Conditions 3.6 Illustration of Certain Definitions 4 Basic Parameters and Classifications 4.1 Measuring Units 4.2 Rated Load 4.3 Sensitivity (Only Applicable to Resistance-strain Type Load Cell without Electronic Components) 4.4 Bridge Circuit Resistance (Only Applicable to Resistance-strain Type Load Cell without Electronic Components) 4.5 Normal Operating Conditions 4.6 Metrological Requirements 5 Maximum Permissible Error of Load Cell 5.1 Maximum Permissible Error for Each Accuracy Class 5.2 Rules Concerning the Determination of Errors 5.3 Permissible Variation of Measurement Result 5.4 Repeatability Error 5.5 Influencing Quantity 6 Requirements for Load Cell with Electronics 6.1 General Requirements 6.2 Acting upon Significant Faults 6.3 Functional Requirements 6.4 Additional Tests 7 Other Technical Requirements 7.1 Insulation Resistance 7.2 Insulation Strength 7.3 Permissible Error between Input Resistance and Output Resistance 7.4 Zero Output 7.5 Appearance 8 Test Methods 8.1 Test Condition 8.2 Test Procedures 8.3 Recommended Test Sequence 9 Inspection Rules 9.1 Delivery Inspection 9.2 Type Inspection 10 Marking, Packaging, Transportation and Storage 10.1 Markings 10.2 Packaging 10.3 Transportation 10.4 Storage Appendix A (Informative) The Comparison Schedule between Chapter and Article Numbers of This Standard and OIML R60:2000 Appendix B (Informative) Proportion of Calculation Methods for Test Results