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GB/T 7721-2017Continuous totalizing automatic weighing instruments (belt weigher) (English PDF)

连续累计自动衡器(皮带秤)

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

Level / Type

National · Recommended

Issue date

December 29, 2017

Implementation date

July 1, 2018

Scope

GB/T 7721-2017 is the English-translated version of 连续累计自动衡器(皮带秤).

GB/T 7721-2017 is the Chinese standard "Continuous totalizing automatic weighing instruments (belt weigher)". Its scope clause reads: This standard stipulates terms, product models, requirements, inspections of belt conveyer type continuous cumulative automatic weighing instruments (hereinafter referred to as “belt scales”).

Methods and rules, signs, packaging, transportation and storage. This standard also provides standardized requirements and test procedures for evaluating the metrological characteristics or technical characteristics of belt weighers in a traceable manner. form.

This standard applies to. --- Using the principle of gravity, a continuous weighing method to determine and accumulate the weight of bulk material. --- Belt weigher used with single speed belt conveyors, variable speed or multi-speed belt conveyors.

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Document preview — GB/T 7721-2017

National Standard of the People's Republic of China

ICS: 17.100
Classification: N 13

Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
3.1 General definition
3.2 Structure
3.3 Measurement Characteristics
3.4 Indications and Errors
3.5 Influences and Reference Conditions
3.6 Test
3.7 Abbreviations and Symbols
3.8 Basic Relationship
4 Product Model
5 Measurement requirements
5.1 Accuracy Level
5.3 Consistency Between Multiple Indicators
5.4 Minimum cumulative load
5.5 Minimum flow
5.6 Unit of measure
5.7 Simulation Test in Type Inspection
5.8 Field Tests in Type Examination
6 Technical Requirements
6.1 Applicability of Use
6.2 Rated operating conditions
6.3 Operational Security
6.4 cumulative display and printing device
6.5 Zero-setting device
6.6 tape correction device
6.7 Displacement Sensor
6.8 Belt Conveyor Connection with Conveyor
7 Additional requirements for electronic belt weighers
7.1 General Requirements
7.2 applies
7.3 Response to Significant Increases
7.4 Indicator Display Test
7.5 Functional Requirements
7.6 Interface
7.7 Data Storage Device
7.8 Software
7.9 Security Performance
7.10 Load cell
7.11 Manufacturing
7.12 Installation
8 Test methods
8.1 General Test Requirements
8.2 Control weights and standard weights
8.3 Simulation test (test with static load without belt conveyor)
8.4 Test Load Quality Truth
8.5 Quality indication
8.6 Relative Error Calculation
8.7 Inspections and Tests
9 Inspection Rules
9.1 Type Inspection
9.2 Factory Inspection
9.3 Checking in Use
10 Signs, Packaging, Transport and Storage
10.1 Mark
10.2 Packaging
10.3 Transportation
10.4 Storage
Appendix A (Normative) Continuous cumulative automatic weighing test method

1 Scope

This standard stipulates terms, product models, requirements, inspections of belt conveyer type continuous cumulative automatic weighing instruments (hereinafter referred to as “belt scales”).

Methods and rules, signs, packaging, transportation and storage.

This standard also provides standardized requirements and test procedures for evaluating the metrological characteristics or technical characteristics of belt weighers in a traceable manner.

form.

This standard applies to.

--- Using the principle of gravity, a continuous weighing method to determine and accumulate the weight of bulk material.

--- Belt weigher used with single speed belt conveyors, variable speed or multi-speed belt conveyors.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article

Pieces. For undated references, the latest version (including all amendments) applies to this document.

GB/T 191 packaging, storage and transportation logo

GB/T 2423.1-2008 Environmental testing for electric and electronic products Part 2. Test methods Test A. Low temperature (IEC 60068-2-

1.2007, IDT)

GB/T 2423.2-2008 Environmental testing for electric and electronic products Part 2. Test methods Test B. High temperature (IEC 60068-2-

2.2007,IDT)

GB/T 2423.3-2016 Environmental testing - Part 2. Test method test Cab. Constant moisture heat test (IEC 60068-2-

78.2001, IDT)

GB/T 2423.4-2008 Environmental testing for electric and electronic products Part 2. Test methods Test Db. Alternating heat test method

Method (IEC 60068-2-30.2005, IDT)

GB/T 2424.1-2015 Environmental test part 3. supporting documents and guidelines for low temperature and high temperature test (IEC 60068-3-1.

2011, IDT)

GB/T 2424.2-2005 Guidelines for Damp Heat Tests for Environmental Testing of Electrical and Electronic Products (IEC 60068-3-4.2001, IDT)

GB/T 2887 Computer Site General Specifications

GB/T 4167 weight

GB/T 4879 rust-proof packaging

GB/T 5048 moisture-proof packaging

GB/T 7551-2008 load cell

GB/T 7724 electronic weighing instrument

GB/T 13384 general technical conditions for mechanical and electrical product packaging

GB 14249.1-1993 Electronic weighing equipment safety requirements

GB/T 14250 weighing terms

GB/T 15395 General Specifications for Electronic Equipment Cabinets

GB/T 17214.2 Working conditions for industrial process measurement and control devices Part 2. Power (IEC 60654-2, IDT)

GB/T 9081 | GB/T 21296.3 | GB/T 21296.2 | GB/T 7724 | GB/T 7722 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 250 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60068 · IEC 60654

Cited by

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