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GB/T 46120.1-2025Standard measurement method of refrigeration basic parameters — Part 1: Temperature measurement (English PDF)

制冷基本参数标准测量方法第1部分：温度测量

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 29, 2025

Implementation date

March 1, 2026

Scope

GB/T 46120.1-2025 is the English-translated version of 制冷基本参数标准测量方法第1部分：温度测量.

GB/T 46120.1-2025 is the Chinese national standard covering measuring temperature when a refrigeration, heat pump or air conditioning unit is under test — the accuracy, precision and error the method is built on, the requirements on the sensor and its installation, the platinum resistance thermometers and thermocouples used, the measurement procedure, the uncertainty budget worked through for both sensor types, and the test report, so that two laboratories testing the same machine agree. Part 1 of the series, first edition. Under the China National Light Industry Council. In force from 1 March 2026. Issued on 29 August 2025, it has been in force since 1 March 2026.

Document preview — GB/T 46120.1-2025

National Standard of the People's Republic of China

ICS: 27.200
Classification: P45/49

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

PrefaceIII
IntroductionIV
1 Scope1
2 Normative References1
3 Terms and Definitions1
4 General Rules3
5 Requirements4
6 Instruments 7.8
7 Temperature measurement8
8 Uncertainty Analysis8
9 Test Report8
Appendix A (Informative) Methods for Temperature Measurement10
Appendix B (Informative) Example 14 of Uncertainty Evaluation for Platinum Resistance Temperature Measurement16
Appendix C (Informative) Examples of thermocouple temperature measurement uncertainty assessment16

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents". Drafting.

This document is Part 1 of GB/T 46120 "Standard Measurement Methods for Basic Parameters of Refrigeration". GB/T 46120 has published the following... part.

— Part 1: Temperature Measurement Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China National Light Industry Council.

This document is under the jurisdiction of the National Technical Committee on Refrigeration Standardization (SAC/TC119).

This document was drafted by: Chinese Association of Refrigeration, Huashang International Engineering Co., Ltd., Beijing Aotaihua Refrigeration Equipment Co., Ltd., and Qingdao Haier.

Air Conditioner Co., Ltd., Jiangsu Baixue Electric Appliance Co., Ltd., Qingdao Haier Special Electric Refrigerator Co., Ltd., Qingdao Hairong Commercial Cold Chain Co., Ltd.

Limited Liability Company, Yindu Catering Equipment Co., Ltd., Zhongshan Duoweier Electric Appliance Co., Ltd., Jiangsu Xingxing Cold Chain Technology Co., Ltd.

Dalian Fuji Iceberg Vending Machine Co., Ltd., Shanghai Haili Zhongye Refrigeration Equipment Co., Ltd., Guangdong Xingxing Refrigeration Equipment Co., Ltd., Aucma Joint-stock company, Shanghai General Fuji Refrigeration Co., Ltd., Bingshan Songyang Cold Chain (Dalian) Co., Ltd., Ningxia Wanshilong Refrigeration Technology Co., Ltd.

Joint-stock company, TÜV Rheinland-Qingdao Inspection (Qingdao) Co., Ltd., Hubei Midea Refrigerator Co., Ltd., Qingdao Dashang Cold Chain Co., Ltd.

Hangzhou Qianjiang Refrigeration Compressor Group Co., Ltd., Tsinghua University, Tianjin University of Commerce, Shanghai University of Science and Technology, Jimei University, Beijing University of Technology Shandong University, Harbin University of Commerce, Hebei University of Science and Technology, Nanjing Branch of China Quality Certification Center Co., Ltd., and Guangzhou Kohler Refrigeration Equipment Co., Ltd.

Equipment Co., Ltd., COFCO Engineering & Testing & Certification Co., Ltd.

The main drafters of this document are: Xiao Yang, Liu Xiaopeng, Wang Bin, Si Chunqiang, Ma Hongkui, Ding Jianbo, Li Bo, Yang Ping, Cheng Junliang, Ma Jin, and Wang Bo.

Wang Taifeng, Pan Xuan, Cui Jian, Ma Chao, Shen Weiqi, He Jiacai, Ren Fei, Wang Shuo, Tang Xueping, Cheng Guiliang, Qiu Fei, Liang Zhennan, Han Xiaowan, Xue Ming, Liu Qingxuan, Wang Chuankui, Li Junming, Shen Jiang, Li Hongqi, Wu Weidong, Ma Yimin, Zhao Hongxia, Li Xiaoyan, Zhang Liangliang, Xu Gonghu, Li Wenhao Chen Xiaohua, Liu Haibo, Chen Yongjun, Zhao Quanhua, Zhang Yan, Kang Boqiang, Wu Dongxia, Zhi Kang, Gao Yunfeng, Yu Yan, Fang Kai, Shen Guanxue, Shen Yiming, Zhang Bao Sun Zhili, Ma Kunru, Li Fei, Liu Zhongyu.

Introduction

GB/T 46120, "Standard Measurement Methods for Basic Refrigeration Parameters," mainly covers the measurement of basic refrigeration parameters. GB/T 46120 aims to provide...

Standard measurement methods for basic refrigeration parameters, to improve the accuracy of measurement and data analysis, GB/T 46120 is proposed to consist of the following 11 parts.

— Part 1: Temperature Measurement. The purpose is to provide methods for measuring the temperature of various parts of a refrigeration system.

— Part 2: Wind Speed and Airflow Measurement. The purpose is to provide a method for measuring wind speed and airflow in refrigeration systems.

— Part 3: Pressure Measurement. The purpose is to provide methods for measuring pressure in various parts of a refrigeration system.

— Part 4: Measurement of Oil Content in Liquid Refrigerants. The purpose is to provide a method for measuring the oil content of liquid refrigerants in refrigeration systems.

— Part 5: Engineering Analysis of Experimental Data. The aim is to provide methods for analyzing measurement data from refrigeration systems.

— Part 6: Humidity Measurement. The purpose is to provide a method for measuring humidity in refrigeration systems.

— Part 7: Gas Flow Measurement. The purpose is to provide a method for measuring gas flow in refrigeration systems.

— Part 8: Liquid Flow Measurement. The purpose is to provide a method for measuring liquid flow in refrigeration systems.

— Part 9: Calorimetric Method for Refrigerant Mass Flow Measurement. The purpose is to provide a method for measuring refrigerant mass flow in refrigeration systems using calorimeters.

Methods for refrigerant mass flow rate.

— Part 10.Flowmeter Method for Refrigerant Flow Measurement. The purpose is to provide a method for measuring refrigerant flow using flowmeters in refrigeration systems.

Methods for determining agent flow rate.

— Part 11.Power Measurement. The purpose is to provide a method for measuring power in refrigeration systems.

Standard Measurement Methods for Basic Refrigeration Parameters Part 1: Temperature Measurement

1 Scope

This document specifies the general rules, requirements, instruments, temperature measurement methods, and uncertainty classification for the standard temperature measurement method in the basic parameters of refrigeration. Analysis and test reports.

This document applies to temperature measurement for testing refrigeration, heat pump, and air conditioning equipment and components.

2 Normative references

GB/T 6379.1

GB/T 11605-2005

GB/T 16839.1-2018

GB/T 18517

3 Terms and Definitions

The terms and definitions defined in GB/T 6379.1 and GB/T 18517, as well as the following terms and definitions, apply to this document.

3.1 truevalue

Unknown, error-free values in the test results.

3.2 accuracy

The degree of agreement between the test results (characteristic values determined by the specified test methods) and the true values.

Note. The term accuracy, when used for a set of test results, consists of random error components and systematic error, i.e., bias components.

3.3 Precision

Under specified conditions, the degree of consistency between independent test results.

Note 1.Precision depends only on the distribution of random errors and is independent of the true or specified values.

Note 2.Precision is usually measured as imprecision, which is expressed as the standard deviation of the test results. The lower the precision, the larger the standard deviation.

Note 3."Independent test results" refers to results obtained on the same or similar test subjects that are not affected by any previous results. Precision is a quantitative measurement.

The degree of repeatability depends strictly on the specified conditions, with repeatability and reproducibility being two extreme cases.

3.4 error

The difference between the test result and the true value.

Note. All errors in the experimental data were categorized into two types. systematic errors (fixed errors) and random errors (precision errors). Accuracy and precision

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 6379.1 · GB/T 16839.1-2018

Editions of GB/T 46120.1

Edition	Title	Revision	Status
GB/T 46120.1-2025	Standard measurement method of refrigeration basic parameters - Part 1: Temperature measurement	current edition	Current

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