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JJF 1787-2019 English PDF

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JJF 1787-2019: Program of Pattern Evaluation of Liquid Level Gauges
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Standard similar to JJF 1787-2019

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Basic data

Standard ID JJF 1787-2019 (JJF1787-2019)
Description (Translated English) Program of Pattern Evaluation of Liquid Level Gauges
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A53
Classification of International Standard 17.100
Word Count Estimation 28,233
Date of Issue 2019
Date of Implementation 2020-03-31
Issuing agency(ies) State Administration for Market Regulation

JJF 1787-2019: Program of Pattern Evaluation of Liquid Level Gauges

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Outline of Type Evaluation of Liquid Level Gauge) National Measurement Technical Specification of the People's Republic of China Outline of Type Evaluation of Liquid Level Gauge Published on December 31,.2019 2020-03-31 Implementation Issued by the State Administration of Market Supervision and Administration Outline of Type Evaluation of Liquid Level Gauge Centralized unit. National Pressure Measurement Technical Committee Main drafting unit. Shanghai Institute of Metrology and Testing Technology Participated in the drafting unit. Shanghai Instrument Automatic Control System Inspection and Testing Co., Ltd. This specification entrusts the National Pressure Measurement Technical Committee to interpret The main drafters of this specification. Tu Limeng (Shanghai Institute of Metrology and Testing Technology) Juan Lun Wang Can (Shanghai Institute of Metrology and Testing Technology) Participating drafters. Guo Aihua (Shanghai Instrument and Control System Inspection and Testing Co., Ltd.) Zhang Tianfei (Shanghai Institute of Metrology and Testing Technology)

table of Contents

Introduction (Ⅲ) 1 Scope (1) 2 References (1) 3 Overview (1) 4 Legal management requirements (1) 4.1 Unit of measurement (1) 4.2 Maximum allowable error (1) 4.3 Marks and logos (2) 4.4 External structure design requirements (2) 5 Measurement requirements (2) 5.1 Indication error (2) 5.2 Output value error (2) 5.3 Return difference (2) 5.4 Repeatability (2) 5.5 Set point error (2) 5.6 Switching difference (2) 6 General technical requirements (3) 6.1 Normal working conditions (3) 6.2 Reference working conditions (3) 6.3 Appearance (3) 6.4 Stability (3) 6.5 Main power supply changes (3) 6.6 Influence of ambient temperature (3) 6.7 Influence of common mode interference (3) 6.8 Power frequency magnetic field immunity performance (3) 6.9 Electrostatic discharge immunity performance (4) 6.10 Radio frequency electromagnetic field radiation immunity performance (4) 6.11 Immunity performance of electrical fast transient burst (4) 6.12 Immunity performance of voltage sag and short-term interruption (4) 6.13 Pressure resistance and tightness (4) 6.14 Insulation resistance (4) 6.15 Dielectric strength (5) 6.16 Adaptability for transportation and storage (5) 7 Type evaluation items (5) 8 Number of prototypes provided (6) 9 Test methods and conditions of test items, data processing and qualification criteria (6) 9.1 Conditions for type evaluation (6) 9.2 Measuring instruments used in test items (6) 9.3 Test points (7) 9.4 Indication error (7) 9.5 Output value error (7) 9.6 Return difference (7) 9.7 Repeatability (8) 9.8 Set point error (8) 9.9 Switching difference (9) 9.10 Appearance (9) 9.11 Stability (9) 9.12 Changes in main power supply (9) 9.13 Influence of ambient temperature (9) 9.14 Effects of common mode interference (10) 9.15 Power frequency magnetic field immunity performance (10) 9.16 Electrostatic discharge immunity performance (10) 9.17 Radio frequency electromagnetic field radiation immunity performance (11) 9.18 Immunity performance of electrical fast transient burst (11) 9.19 Immunity performance of voltage sag and short-term interruption (11) 9.20 Pressure resistance and tightness (11) 9.21 Insulation resistance (12) 9.22 Dielectric strength (12) 9.23 Adaptability for transportation and storage (12) Appendix A Original Record Format (13)

Introduction

JJF 1016 "Guidelines for Compiling the Outline of Evaluation of Measuring Instruments", JJF 1059.1-2012 "Evaluation of Uncertainty in Measurement" "Determining and expressing" together constitute the basic series of specifications formulated in this outline. The requirements and methods of the test items in this outline refer to JJG971 "level gauge", GB/T 18271.3 "process measurement" And control devices general performance assessment methods and procedures Part 3. Tests for the influence of influence quantities, GB/T 25480 "Basic environmental conditions and test methods for instrumentation, transportation and storage", GB/T 17626 "Electromagnetic compatibility test and Normative documents such as Measurement Technology. This outline is published for the first time. Outline of Type Evaluation of Liquid Level Gauge

1 Scope

This type evaluation outline is applicable to the type evaluation of the level gauge with the classification code of measuring instruments of 01320000.

2 Reference documents

The outline refers to the following documents. JJG971 level gauge GB/T 17626.2 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test GB/T 17626.3 Electromagnetic compatibility test and measurement technology RF electromagnetic field radiation immunity test GB/T 17626.4 Electromagnetic compatibility test and measurement technology Electrical fast transient pulse group immunity test GB/T 17626.8 EMC test and measurement technology power frequency magnetic field immunity test GB/T 17626.11 Electromagnetic compatibility test and measurement technology for voltage sags, short interruptions and voltage changes Immunity test GB/T 18271.3 General performance evaluation methods and procedures for process measurement and control devices Part 3. Influence Quantity impact test GB/T 25480 Basic environmental conditions and test methods for transportation and storage of instrumentation For dated reference documents, only the dated version applies to this specification; for those without date references The latest version (including all amendments) is applicable to this specification.

3 Overview

Liquid level gauges are widely used for the measurement of internal liquid levels or interfaces in tanks, kettles, towers, bottles, furnaces, channels, etc. in industrial processes With control. According to the measurement principle, the liquid level gauge can be divided into combined type, buoyancy type, pressure type, reflection type, and electrical characteristic type. Combined type. (quartz) glass tube level gauge, glass plate level gauge; Buoyancy type. magnetic turning column (plate) level gauge, magnetostrictive level gauge, servo level gauge, steel belt level gauge, (electricity) Float level gauge, float level gauge; Pressure type. static pressure (input) level gauge (transmitter), differential pressure level gauge (transmitter); Reflective. radar level gauge, ultrasonic level gauge, guided wave radar level gauge; Electrical characteristics. RF admittance level gauge, capacitance level gauge, etc.

4 Legal management requirements

4.1 Unit of measurement The liquid level gauge shall adopt the national legal measurement unit m (meter), or its decimal multiple unit. mm, cm, etc. 4.2 Maximum allowable error The maximum allowable error of the level gauge should be expressed by absolute error or quoted error.

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