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JJG 551-2021 English PDF

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JJG 551-2021: (Verification Regulations of Sulfur Dioxide Gas Detector)
Status: Valid

JJG 551: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 551-2021English299 Add to Cart 3 days [Need to translate] (Verification Regulations of Sulfur Dioxide Gas Detector) Valid JJG 551-2021
JJG 551-2003English170 Add to Cart 0--9 seconds. Auto-delivery Verification regulation of sulfur dioxide gas detectors Obsolete JJG 551-2003
JJG 551-1988English639 Add to Cart 5 days [Need to translate] Verification Regulation of Sulfur Dioxide Analyzer Obsolete JJG 551-1988

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Basic data

Standard ID JJG 551-2021 (JJG551-2021)
Description (Translated English) (Verification Regulations of Sulfur Dioxide Gas Detector)
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A61
Word Count Estimation 15,153
Issuing agency(ies) State Administration for Market Regulation

JJG 551-2021: (Verification Regulations of Sulfur Dioxide Gas Detector)

---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.
(Verification Regulations of Sulfur Dioxide Gas Detector) People's Republic of China National Metrological Verification Regulations Sulfur dioxide gas detector Published on 2021-07-28 2022-01-28 Implementation Released by the State Administration for Market Regulation Sulfur dioxide gas detector verification regulations Replacing JJG 551-2003 Focal Point. National Technical Committee of Environmental Chemical Metrology Main drafting unit. China Institute of Testing Technology Shanghai Institute of Metrology and Testing Technology Participating in the drafting unit. Henan Institute of Metrology Gansu Metrology Research Institute This regulation is entrusted to the National Environmental Chemical Metrology Technical Committee to be responsible for the interpretation The main drafters of this regulation. Liu Qing (China Institute of Testing Technology) Ye Hong (Shanghai Institute of Metrology and Testing Technology) Zhang Yi (China Institute of Testing Technology) Participating drafters. Cai Jianhua (Shanghai Institute of Metrology and Testing Technology) Li Bo (Henan Institute of Metrology) Shi Liyu (Gansu Metrology Research Institute) Qi Ji (China Institute of Testing Technology)

content

Introduction (Ⅱ) 1 Scope(1) 2 Overview(1) 3 Measurement performance requirements (1) 4 General technical requirements (1) 4.1 Appearance and structure(1) 4.2 Signs and identification(2) 4.3 Power-on inspection(2) 4.4 Alarm function check (2) 4.5 Insulation resistance(2) 5 Measuring Instrument Control(2) 5.1 Verification Conditions (2) 5.2 Verification items (3) 5.3 Verification method (3) 5.4 Processing of Verification Results (5) 5.5 Verification Period(5) Appendix A Verification Original Record (6) Appendix B Verification Certificate/Inner Page Format of Verification Result Notification (8)

Introduction

The main technical indicators of this regulation refer to GB 12358-2006 "Workplace Environmental Gas Detection and Alarm Instrument Communication "Technical Requirements", GB/T 13971-2013 "Technical Conditions for Ultraviolet Gas Analyzers", GB/T 25923-2010 "Technical Conditions for Online Gas Analyzers", GB/T 25929-2010 "Technical Conditions for Infrared Gas Analyzers" and other technical regulations. This regulation is the revision of JJG 551-2003 "Sulfur Dioxide Gas Detector". with JJG 551- Compared with.2003, the main technical changes except editorial changes are as follows. --- Modified the scope of application (see Chapter 1); ---Modified the measurement performance requirements, listed the sulfur dioxide gas analyzer and sulfur dioxide gas detection alarm respectively The measurement performance requirements of the instrument (see Chapter 3); --- Deleted the alarm setting error in the.2003 version of the regulations. For the sulfur dioxide gas detection alarm, add Check the alarm function (see 4.4); ---Modified the expression of relative expanded uncertainty and inclusion factor of sulfur dioxide gas standard material, changed.2003 In the annual edition, the relative expanded uncertainty is not more than 2% (k=3), and is revised to "When calibrating the sulfur dioxide gas analyzer, nitrogen The relative expanded uncertainty of sulfur dioxide gas standard material is not more than 1.5%, k=2; When the alarm instrument is used, the relative expanded uncertainty of the standard substance of sulfur dioxide gas in nitrogen is not more than 2%, and k=2". "When using gas When diluting the device, the relative expanded uncertainty of the standard gas after dilution shall meet the above requirements” (see 5.1.2.1); --- Modify the accuracy level of the flowmeter in the.2003 version of the regulations to not be lower than level 3 to be not lower than the accuracy level Class 4.0 (see 5.1.2.3); ---Delete the dielectric strength verification item, and delete the dielectric strength tester and the dielectric strength verification method. expression; --- Added the information and format of the inner page of the verification certificate/verification result notification (see Appendix B). The previous versions of this regulation have been released as follows. ---JJG 551-2003; ---JJG 551-1988. Sulfur dioxide gas detector verification regulations

1 Scope

This regulation is applicable to the initial verification, subsequent verification and in-use inspection of sulfur dioxide gas detectors. sulfur dioxide Gas detectors include sulfur dioxide gas detection alarms and sulfur dioxide gas analyzers. This regulation does not apply to sulfur dioxide gas analyzers and stationary pollution sources whose concentration is less than 1 μmol/mol Sulfur dioxide gas analyzer for flue gas emission monitoring.

2 Overview

The sulfur dioxide gas detection and alarm instrument is mainly used to detect the concentration of sulfur dioxide gas in the workplace environment. It is composed of detection unit, signal processing unit, display unit and alarm unit. The detection principle is mainly electrochemical method. When the displayed value is greater than the alarm setting value, it has sound, light or vibration alarm. According to the sampling method, it can be divided into diffusion type and pump suction According to the way of use, it can be divided into portable and fixed type; according to the way of work, it can be divided into continuous measurement and discontinuous Measurement. The sulfur dioxide gas analyzer is mainly used to detect the concentration of sulfur dioxide gas in the production process and workplace environment. It is mainly composed of a detection unit, a signal processing unit and a display unit. The detection principles are mainly spectroscopy, thermal conductivity law, etc. According to the sampling method, it can be divided into positive pressure conveying type and pump suction type; according to the working method, it can be divided into continuous measurement and discontinuous measurement. sex measurement.

3 Measurement performance requirements

The metering performance requirements are shown in Table 1. Table 1 Metrology performance requirements Test item Metrology performance requirements Sulfur dioxide gas analyzer sulfur dioxide gas detection alarm Indication error ±3%FS ±5%FS or ±10% Satisfy one of them Repeatability 1.5% 2% Response time 90s 60s drift Zero drift ±1%FS ±2%FS Range drift ±2%FS ±3%FS

4 General technical requirements

4.1 Appearance and structure 4.1.1 The instrument should not have external damage that affects its normal operation. The surface of the newly manufactured instrument should be smooth, smooth and painted.

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