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JJG 225-2024 English PDF

US$439.00 · In stock
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JJG 225-2024: Verification Regulation of Heat Meters
Status: Valid

JJG 225: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJG 225-2024	English	439	Add to Cart	4 days [Need to translate]	Verification Regulation of Heat Meters	Valid	JJG 225-2024
JJG 225-2001	English	779	Add to Cart	5 days [Need to translate]	Verification Regulation of Heat Meters	Valid	JJG 225-2001
JJG 225-1992	English	559	Add to Cart	4 days [Need to translate]	(Heat Meter)	Obsolete	JJG 225-1992

Basic data

Standard ID	JJG 225-2024 (JJG225-2024)
Description (Translated English)	Verification Regulation of Heat Meters
Sector / Industry	Metrology & Measurement Industry Standard
Word Count Estimation	21,235
Date of Issue	2024-10-19
Date of Implementation	2025-04-19
Issuing agency(ies)	State Administration for Market Regulation

JJG 225-2024: Verification Regulation of Heat Meters

---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.
National Metrology Verification Regulations of the People's Republic of China Heat meter calibration procedures Released on 2024-10-19 2025-04-19 Implementation The State Administration for Market Regulation issued Heat meter calibration procedures Replaces JJG 225-2001 Contents other than Appendix A Responsible unit. National Flow Measurement Technical Committee Liquid Flow Technical Committee Main drafting unit. China National Institute of Metrology Tianjin Institute of Metrology Supervision and Inspection Science Beijing Institute of Metrology and Testing Science Shandong Institute of Metrology Participating in the drafting. Xuzhou Runwu Technology Development Co., Ltd. Guangzhou Baicheng Intelligent Technology Co., Ltd. This regulation is entrusted to the Liquid Flow Technical Committee of the National Flow Measurement Technical Committee for interpretation The main drafters of this regulation are. Qiu Ping (China National Institute of Metrology) Shi Xin (Tianjin Institute of Metrology Supervision and Inspection Science) Zhang Liqian (Beijing Institute of Metrology and Testing Science) Gu Zukang (Shandong Institute of Metrology) Participating drafters. Li Xiaopeng (China National Institute of Metrology) Wang Hualiang (Xuzhou Runwu Technology Development Co., Ltd.) Tan Wensheng (Guangzhou Baicheng Intelligent Technology Co., Ltd.)

Introduction (II) 1 Scope(1) 2 References(1) 3 Terminology and units of measurement (1) 4 Overview(3) 5 Metrological performance requirements (3) 6 General technical requirements (4) 7 Measuring instrument control (6) Appendix A Format of the inner pages of the verification certificate and verification result notification (13) Appendix B Density and specific enthalpy of water (14)

Introduction

JJF1002 "Rules for the Preparation of National Metrology Verification Procedures", JJF1001 "General Metrology Terms and Definitions" and JJF1059.1 "Evaluation and Expression of Uncertainty in Measurement" together constitute the basic series supporting the formulation of this regulation. specification. This revision of the regulation is based on JJG 225-2001 "Heat Energy Table" and refers to GB/T 32224-2015 "Heat Energy Table". Heat meter, OIMLR75.2002 (E) Heat meter ters) and European Standard EN1434.2015 "Heatmeters" for initial verification. Combined with the actual situation of heat meter manufacturing and application in my country, the technical indicators and main test methods are consistent with national standards and international International recommendations and European standards are basically consistent. This regulation is a revision of the contents other than Appendix A of JJG 225-2001 "Heat Energy Meter". In comparison, this regulation only involves the content of heat meter verification, and the content of type evaluation is covered by a separately formulated type evaluation standard. In addition to editorial changes, the main technical changes in this revision are as follows. ---Add the introduction; --- Add thermal coefficient method to the overview; ---Add relevant content of cold meter; --- Increase the content of the determination of the component value in the total amount verification method; --- Added component combination method verification of indication error; --- Deleted the content of finalization identification and prototype test; --- Deleted the content of the component method verification method; --- Deleted the repeatability error requirements for non-impeller flow sensors; ---Detailed the display resolution requirements for use mode and verification mode; ---The accuracy/uncertainty of the paired temperature sensor calibration device is modified to be less than or equal to the paired temperature of the heat meter. 1/3 of the absolute value of the maximum allowable error of the sensor; --- Modified the maximum allowable error of level 1 meter and single temperature sensor; --- Added accuracy/uncertainty requirements for electrical measuring instruments in paired temperature sensor calibration devices; ---The verification cycle has been modified. The previous versions of this regulation are as follows. ---Contents other than Appendix A of JJG 225-2001. Heat meter calibration procedures

1 Scope

This regulation applies to the first use of heat meters with a nominal diameter (referred to as diameter) not exceeding 400 mm using water as the medium. Verification and follow-up verification.

2 References

This regulation refers to the following documents. JJF1004-2004 Flow Measurement Terms and Definitions For any referenced document with a date, only the version with the date shall apply to the regulations; for any referenced document without a date, The latest version (including all amendments) applies to this regulation.

3 Terminology and units of measurement

3.1 Terminology The terms and definitions defined in JJF1004-2004 and the following apply to this regulation. 3.1.1 Heat meter An instrument that measures and displays the heat released or absorbed by a medium flowing through a heat exchange system. Note. 1 It can be divided into heat meter, cold meter and hot and cold meter. 2 A heat meter is a heat meter that measures and displays the heat released by a medium flowing through a heat exchange system. 3 The cold meter is a heat meter that measures and displays the heat absorbed by the medium flowing through the heat exchange system. The medium temperature is (2~30)℃, the temperature difference is not more than 20K. 4 The heat and cold meter is used to measure and display the heat released or absorbed by the medium flowing through the heat exchange system, and The heat collected is displayed and stored separately in a heat meter. 3.1.2 Complete instrument It consists of flow sensor, calculator, paired temperature sensor and other components, which cannot be disassembled and must be installed as a whole. The heat meter. 3.1.3 Combined heat meter combined instrument A heat meter consisting of a flow sensor, a calculator, a paired temperature sensor and other components that can be installed and used in combination. 3.1.4 Flow sensor A component installed in a heat exchange system to collect and send media flow data. 3.1.5 Temperature sensor A component installed at the inlet and outlet of a heat exchange system to collect and send medium temperature data. Temperature sensors with identical or similar metrological characteristics and used in pairs.

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