1 Scope
This standard specifies the product structure and classification, basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage for electromagnetic flowmeters (hereinafter referred to as "flowmeter").
This standard is applicable to the electromagnetic flowmeters used for measuring the conducting liquid flow in closed pipeline.
This standard is not applicable to plug-in electromagnetic flowmeters and the electromagnetic flowmeters used for measuring open channel flow.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 191-2008 Packaging—Pictorial Marking for Handling of Goods
GB/T 2829-2002 Sampling Procedures and Tables for Periodic Inspection by Attributes (Apply to Inspection of Process Stability)
GB 3836 (all parts) Explosive Atmospheres
GB 4208-2008 Degrees of Protection Provided by Enclosure (IP Code)
GB/T 9112-2010 Types and Parameters for Steel Pipe Flanges
GB/T 13384-2008 General Specifications for Packing of Mechanical and Electrical Product
GB/T 17626.2 Electromagnetic Compatibility(EMC)—Testing and Measurement Techniques—Electrostatic Discharge Immunity Test
GB/T 17626.3 Electromagnetic Compatibility-Testing and Measurement Techniques—Radiated Radio-frequency Electromagnetic Field Immunity Test
GB/T 17626.4 Electromagnetic Compatibility—Testing and Measurement Techniques-Electrical Fast Transient/Burst Immunity Test
GB/T 17626.5 Electromagetic Compatibility—Testing and Measurement Techniques—Surge (Impact) Immunity Test
GB/T 17626.8 Electromagetic Compatibility-Testing and Measurement Techniques-Power Frequency Magnetic Field Immunity Test
GB/T 17626.11 Electromagnetic Compatibility—Testing and Measurement Techniques—Voltage Dips, Short Interruptions and Voltage Variations Immunity Tests
GB/T 18271.3 Process Measurement and Control Devices—General Methods and Procedures for Evaluating Performance—Part 3: Tests for the Effects of Influence Quantities
GB/T 18659-2002 Measurement of fluid flow in closed conduits—Methods of evaluating the performance of electromagnetic flow-meters for liquids
GB/T 20729-2006 Measurement of conductive liquid flow in closed conduits—Flanged electromagnetic flowmeters—Overall length
GB/T 25474-2010 Values of nominal size for industrial process measurement and control instruments
GB/T 25480-2010 Basic environmental conditions and testing methods for transportation and storage of instruments
3 Term and Definition
For the purposes of this document, the terms and definitions given in GB/T 18659-2002 and those below apply.
3.1
constant of primary device
an inherent factor of sensor, equivalent to the electromotive force of signal of a certain field current, or the field current producing a certain electromotive force, at 1m/s flow rate. It may serve as the ratio of electromotive force of signal to reference signal of magnetic field.
Foreword i
1 Scope
2 Normative References
3 Term and Definition
4 Product Structure and Classification
4.1 Basic Structure
4.2 Classification
5 Basic Parameters
5.1 Nominal Drift Diameter
5.2 Connection Dimensions
5.3 Measuring Range of Flow
5.4 Accuracy Classes
5.5 Output Signals
5.6 Working Environment Temperature and Relative Humidity
5.7 Mechanical Vibration
5.8 Power Supply
5.9 Output Load Resistance
5.10 Temperature of To-be-tested Liquid
5.11 Rated Working Pressure
5.12 Length of Straight Tube Section
6 Technical Requirements
6.1 Requirements of Accuracy
6.2 Requirements of Influence Quantity
6.3 Other Requirements
6.4 Basic Functional Requirements for Intelligent Flowmeter
7 Test Methods
7.1 Test Conditions
7.2 Tests for Accuracy
7.3 Tests for Influence Quantities
7.4 Other Tests
7.5 Basic Function Tests of Intelligent Flowmeter
8 Inspection Rules
8.1 Delivery Inspection
8.2 Type Inspection
8.3 Sampling Scheme and Judgment Rules
9 Marking, Packaging and Storage
9.1 Marking
9.2 Packaging
9.3 Storage
Bibliography
