GB/T 42125.4-2024Safety requirements for electric equipment for measurement, control, and laboratory use - Part 4: Particular requirements for climatic and environmental testing and other temperature conditioning equipment (English PDF)

Foreword

This document was issued on 26 October 2024 by the State Administration for Market Regulation; Standardization Administration of the PRC and takes effect on 1 November 2026.

It is a GB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

It is classified under ICS 19.080, Chinese classification N09.

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"

Drafting.

This document is Part 4 of GB/T 42125 "Safety requirements for electrical equipment for measurement, control and laboratory use".

The following parts have been published.

--- Part 1.General requirements;

--- Part 2.Particular requirements for laboratory equipment for heating materials;

--- Part 3.Particular requirements for refrigeration equipment;

--- Part 4.Particular requirements for climate and environmental tests and other temperature regulation equipment;

--- Part 5.Particular requirements for laboratory centrifuges;

--- Part 7.Safety requirements for hand-held and hand-operated probe assemblies for electrical measurement and test;

--- Part 10.Particular requirements for insulation resistance measurement and dielectric strength test equipment;

--- Part 14.Particular requirements for automatic and semi-automatic equipment for laboratory use for analytical and other purposes;

--- Part 18.Particular requirements for control equipment;

--- Part 19.Particular requirements for electric control valve actuators.

This document is equivalent to IEC 61010-2-012.2019 "Safety requirements for electrical equipment for measurement, control and laboratory use Part 2-012

Part 3.Special requirements for climate and environmental tests and other temperature regulation equipment.

The following minimal editorial changes have been made to this document.

--- In order to coordinate with the existing standard, the name of the standard is changed to "Safety requirements for electrical equipment for measurement, control and laboratory use Part 4.

Special requirements for climate and environmental testing and other temperature regulation equipment";

--- Deleted the informative Appendix L "Term Index".

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document was proposed by the China Machinery Industry Federation.

This document is under the jurisdiction of the National Technical Committee for Safety Standardization of Measurement, Control and Laboratory Electrical Equipment (SAC/TC338).

This document was drafted by. Hangzhou Xuezhongtan Constant Temperature Technology Co., Ltd., Mechanical Industry Instrumentation Comprehensive Technology and Economic Research Institute, Beijing Printing

Brush College, Beijing Medical Device Inspection Institute (Beijing Medical Bioprotection Equipment Inspection and Research Center), Fujian Shunchang Hongrun Precision Instrument

Co., Ltd., China Electronics Technology Standardization Institute, China Quality Certification Center, China Silian Instrument Group Co., Ltd., China Qualified

National Accreditation Center for Assessment, Fujian Shangrun Precision Instrument Co., Ltd., Shanghai Instrument and Automation System Inspection and Testing Institute Co., Ltd., Qingdao Hai

Er Biomedical Co., Ltd., Hangzhou Yungu Technology Co., Ltd., Liaoning Institute of Metrology, Shanghai Metrology and Testing Technology

Institute, Sichuan Provincial Institute of Drug Control (Sichuan Provincial Medical Device Testing Center), Guangdong Provincial Medical Device Quality Supervision and Inspection Institute, Guangzhou

Lightia Lighting Co., Ltd., TUV Rheinland Testing and Certification Services (China) Co., Ltd., MicroPort Investment Holdings Co., Ltd., Zhengzhou Great Wall Science and Technology

Trade Co., Ltd., Fujian Product Quality Inspection Institute, Hangzhou Qi Intelligent Source Technology Co., Ltd., Zhejiang Keen Experimental Equipment Co., Ltd.

Co., Ltd., Hunan Yanjian Intelligent Technology Co., Ltd., Wenzhou Luxury Auto Parts Co., Ltd., Hunan Meiyu Technology Co., Ltd., Wuxi Lambton

Technology Co., Ltd., Guangdong Jinding Optical Technology Co., Ltd., Danbo Instrument (Kunshan) Co., Ltd., Jiangsu Youshang Environmental Engineering Co., Ltd.

Co., Ltd., Xiamen Yuanqian Electronics Co., Ltd., Suzhou Beiyin Technology Co., Ltd., Anhui Wanrui Refrigeration Technology Co., Ltd., Hangzhou Meiyi

AUTOMATION LIMITED.

The main drafters of this document are. Xu Yueming, Shang Yujia, Kong Jiayi, Liu Xiaojing, Liang Zhenshi, Chen Zhiyang, Guo Jianyu, Hu Nan, Li Jinlan, Ni Jia,

Wang Liwen, Ge Jian, Zhang Yixiang, Wang Yi, Ding Yun, Liang Guoding, Feng Jian, Zhang Yi, Guan Hui, Fan Xiang, Lü Henan, Mai Miao, Ding Yi, Wang Chengying, Feng Lei,

Wang Jiakai, Zhu Nairong, Xu Yijun, Wu Jinwei, Yuan Lijun, Jiang Hanxiong, Ye Zhiyue, Sun Dahai, Bai Bing, Chen Xifu, Luo Shuijin, Ding Changjian,

Mei Lihua, Zhang Kaifeng, Xie Weimin, Zhang Xuehua, and Ye Zhizeng.

Introduction

GB/T 42125 "Safety requirements for electrical equipment for measurement, control and laboratory use" is planned to consist of 20 parts.

--- Part 1.General requirements. The purpose is to specify the general safety requirements of electrical equipment for measurement, control and laboratory use and their accessories

Require.

--- Part 2.Particular requirements for laboratory equipment for material heating. The purpose is to specify the special requirements for laboratory equipment for material heating.

Safety requirements.

--- Part 3.Particular requirements for refrigeration equipment. The purpose is to specify the special safety requirements for refrigeration equipment used in measurement, control and laboratory

Require.

--- Part 4.Climate and environmental tests and special requirements for other temperature regulation equipment. The purpose is to specify climate and environmental tests

Special safety requirements for testing and other temperature regulating equipment.

--- Part 5.Particular requirements for laboratory centrifuges. The purpose is to specify special safety requirements for laboratory centrifuges.

--- Part 6.Particular requirements for test and measuring circuits. The purpose is to specify special safety requirements for test and measuring circuits.

--- Part 7.Safety requirements for hand-held and hand-operated probe assemblies for electrical measurement and testing. The purpose is to specify the safety requirements for hand-held and hand-operated probe assemblies.

Safety requirements for head assemblies and related accessories.

--- Part 8.Particular requirements for hand-held and hand-operated current sensors for electrical measurement and testing. The purpose is to specify the requirements for hand-held and hand-operated current sensors.

Special safety requirements for current sensors.

--- Part 9.Particular requirements for household and professional handheld multimeters capable of measuring mains voltage.

Particular safety requirements for hand-held multimeters for household and professional use for measuring mains supply voltage.

--- Part 10.Particular requirements for insulation resistance measurement and dielectric strength test equipment. The purpose is to specify the output voltage AC

Safety requirements for equipment used for insulation resistance measurement and dielectric strength testing at 50 V or DC 120 V and above.

--- Part 11.Particular requirements for sterilizers and washer-disinfectors for processing medical materials.

Particular safety requirements for sterilizers and washer-disinfectors.

--- Part 12.Particular requirements for laboratory mixing and stirring equipment. The purpose is to specify electric stirring equipment used for mechanical stirring and stirring

Particular safety requirements for laboratory equipment and its accessories.

--- Part 13.Particular requirements for laboratory atomic spectrometers with thermal atomization and ionization.

Particular safety requirements for atomization and ionization atomic spectrometers.

--- Part 14.Particular requirements for automatic and semi-automatic equipment for laboratory analysis and other purposes. The purpose is to specify the

Particular safety requirements for automatic and semi-automatic equipment for analytical and other purposes.

--- Part 15.Particular requirements for cabinet X-ray systems. The purpose is to specify special safety requirements for cabinet X-ray systems.

--- Part 16.Particular requirements for in vitro diagnostic (IVD) medical devices. The purpose is to specify the intended use for in vitro diagnostic medical purposes

Special requirements for medical devices.

--- Part 17.Particular requirements for equipment used by children in educational institutions. The purpose is to specify the requirements for the use of equipment by student operators in educational institutions.

Particular safety requirements for electrical equipment and accessories.

--- Part 18.Particular requirements for control equipment. The purpose is to specify the special requirements and related requirements for control equipment used in industrial environments

identification test.

--- Part 19.Particular requirements for electric control valve actuators. The purpose is to specify the requirements for electric control valve actuators installed in industrial processes or discrete control

Safety requirements for electric control valve actuators and solenoid coils in environments.

--- Part 20.Particular requirements for industrial communication circuits and communication port interconnections. The purpose is to specify the requirements for installation in process or discrete control

Particular safety requirements for industrial communication circuits in an environment.

Note. The correspondence between each part and the IEC 61010 series standards is as follows.

--- Part 1 corresponds to IEC 61010-1;

--- Part 2 corresponds to IEC 61010-2-010;

--- Part 3 corresponds to IEC 61010-2-011;

--- Part 4 corresponds to IEC 61010-2-012;

--- Part 5 corresponds to IEC 61010-2-020;

--- Part 6 corresponds to IEC 61010-2-030;

--- Part 7 corresponds to IEC 61010-031;

--- Part 8 corresponds to IEC 61010-2-032;

--- Part 9 corresponds to IEC 61010-2-033;

--- Part 10 corresponds to IEC 61010-2-034;

--- Part 11 corresponds to IEC 61010-2-040;

--- Part 12 corresponds to IEC 61010-2-051;

--- Part 13 corresponds to IEC 61010-2-061;

--- Part 14 corresponds to IEC 61010-2-081;

--- Part 15 corresponds to IEC 61010-2-091;

--- Part 16 corresponds to IEC 61010-2-101;

--- Part 17 corresponds to IEC 61010-2-130;

--- Part 18 corresponds to IEC 61010-2-201;

--- Part 19 corresponds to IEC 61010-2-202;

--- Part 20 corresponds to IEC 61010-2-203.

IEC 61010-2-012, together with IEC 61010-2-010 and IEC 61010-2-011, addresses the application of heating and

Special hazards during cooling process. The three documents are organized as follows.

IEC 61010-2-010 specifically addresses the hazards associated with equipment containing heating systems

IEC 61010-2-011 specifically addresses the hazards associated with equipment containing refrigeration systems

IEC 61010-2-012

Specifically addresses the hazards associated with combined equipment that contains both heating and cooling systems that interact with each other.

equipment and heating or cooling systems alone present additional or more severe hazards; this document also addresses the

Hazards associated with handling materials exposed to elements such as radiation, high humidity, carbon dioxide, and mechanical movement

Guidelines for Correctly Selecting 3 Related Documents

For equipment that only includes a material heating system and does not include a cooling system or other environmental factors, it must meet the requirements of IEC 61010-2-010.

IEC 61010-2-011 and IEC 61010-2-012.

Equipment for material heating systems or other environmental factors must meet the requirements of IEC 61010-2-011 and does not need to meet the requirements of IEC 61010-2-010 and

However, for equipment that contains both a material heating system and a cooling system, or is used in the intended application

When handling materials that introduce significant heat into the refrigeration system, the selection process is more efficient than evaluating both systems separately (controlling temperature, see Figure 102).

If the interaction between the heating and cooling functions creates additional or more serious hazards,

If the use of the device does not create additional or more serious hazards, then the two functions must meet the requirements of IEC 61010-2-010 and IEC 61010-2-011 respectively.

requirements; on the contrary, if additional or more serious hazards are generated, or if the equipment also contains other elements of material processing, the equipment shall meet

The requirements of IEC 61010-2-012 are met, rather than the requirements of IEC 61010-2-010 or IEC 61010-2-011.

What are the dangers of refrigeration systems?

The refrigeration system consisting of a motor-compressor, a condenser, an expansion device and an evaporator (as shown in Figure 101) includes but is not limited to the following.

Typical hazards described.

---The maximum temperature of the low-pressure side of the motor-compressor (return air temperature). The motor-compressor uses refrigerant to cool the motor, and it is necessary to ensure

The maximum temperature on the low voltage side shall not exceed the insulation rating of the motor under the most unfavorable conditions.

---The maximum pressure at the low-pressure side inlet of the motor-compressor. The motor-compressor housing directly bears this pressure, so the motor-

The compressor casing must be designed to withstand the most adverse pressure conditions while providing suitable pressure vessels.

Safety margin.

--- Maximum temperature on the high-pressure side of the condenser. Under the most unfavorable conditions, if the operator is exposed to this temperature or the insulation deteriorates, the condenser

The temperature on the high pressure side of the device may cause a dangerous temperature change.

--- Maximum pressure at the high-pressure side outlet of the motor-compressor. from the refrigerant components downstream of the motor-compressor to the expansion device

Directly bear the pressure, so the design rating of these components must ensure that they can withstand the pressure under the most adverse conditions, and at the same time

The force container provides an appropriate safety margin.

---Maximum control temperature. the soaking temperature condition for releasing heat, which may affect the maximum temperature of the low-pressure side of the motor-compressor and

If the operator is exposed to such temperature or the insulation deteriorates, it will cause a temperature hazard.

Whether it is the overall heating function of the equipment or the heat release of the cooled material, the impact under the most unfavorable conditions needs to be evaluated.

--- When the refrigeration system is operating under the most unfavorable conditions, including any defrost cycle that may be applicable, the equipment should establish a stable current

consumption.

The most unfavorable conditions of the equipment need to be determined, including the most unfavorable normal use conditions and the most unfavorable test results under single fault conditions.

Figure 101 Schematic diagram of a refrigeration system including a condenser

The selection process is shown in Figure 102.

Figure 102 Selection process flow chart

This document should be combined with GB/T 42125.1-2024 "Safety requirements for electrical equipment for measurement, control and laboratory use Part 1.General

Requirements》.

The part marked "applicable" in this document indicates that the corresponding clauses of GB/T 42125.1-2024 are applicable to this document;

The part marked "replace" or "modify" indicates that the terms of this document shall prevail; the part marked "add" in this document indicates that in addition to complying with

In addition to the corresponding clauses of GB/T 42125.1-2024, the clauses added in this document must also be complied with.

The number of the clauses added to this document begins with 101, for example, 3.1.101.The number of the appendixes added to this document begins with AA, for example,

Such as Appendix AA and Appendix BB.

Safety requirements for electrical equipment for measurement, control and laboratory use

Part 4.Climatic and environmental tests and other temperatures

Special requirements for regulating equipment

1 Scope

GB/T 42125.4-2024 carries the particular safety requirements for climatic and environmental test chambers and other temperature conditioning equipment, within the Chinese adoption of the IEC 61010 series for measurement, control and laboratory equipment. These machines are a distinctive hazard case: they hold large volumes at temperatures from far below ambient to several hundred degrees, they may run unattended for weeks, they contain refrigerant under pressure and often flammable refrigerant at that, and the specimen inside them can itself burn or explode. The standard modifies the general requirements of Part 1 clause by clause to deal with that, covering the protection against mechanical hazards, the resistance to mechanical stress, the prevention of the spread of fire, the temperature limits and heat resistance of the equipment, the protection against hazards from fluids and solid foreign bodies, against radiation including laser sources and against sound and ultrasonic pressure, the protection against released gases and substances and against explosion and implosion, the components and assemblies, and the protection by interlocks. For a chamber manufacturer or a laboratory buying one in China, this is the safety text a product is certified against.

Except for the following, Chapter 1 of GB/T 42125.1-2024 is applicable.

1.1.1 Equipment to which this document applies

replace.

Replace the second paragraph with the following.

This document specifies the safety requirements for electrical equipment of categories a) to c) and their accessories, regardless of their intended use, provided that the equipment contains the following

Next one or more characteristics.

--- A cooling system that is affected or influenced by a self-contained heating function, making the combined heating and cooling system different from a single heating or cooling system.

The system presents additional and/or more severe hazards than the

---In the intended application, the material to be processed will introduce significant heat into the refrigeration system, causing the refrigeration system to

There may be additional and/or more severe hazards than when operating with

--- Irradiation of the material to be processed may create additional hazards.

--- Exposing the material to be treated to high humidity, carbon dioxide, salt spray or other substances may create additional hazards.

--- Mechanical movement functions create additional hazards.

--- Provide conditions for operators to enter the operating area to load or unload materials to be processed.

Increase.

Add the following after the first paragraph.

NOTE 101.For example, this type of equipment includes environmental test and plant growth test chambers, refrigeration cycle devices with heating functions, cooling water circulation devices for removing heat, and

Ring device, etc.

Equipment, in whole or in part, may fall within the scope of this document and one or more other parts of the IEC 61010 series of standards.

Scope. In this case, the requirements of these standards also apply. This document applies when one or more additional hazards listed above are introduced.

However, if the equipment only contains a cooling system, or only contains a heating function, or contains both a cooling system and a heating function but does not introduce

If there are additional hazards described in the above items, then use IEC 61010-2-011 or IEC 61010-2-010, or both, as applicable.

Replaces this document.

Further information is provided in the selection process flow chart (Figure 102) and guidelines in the Introduction.

NOTE 102.3.1.107 and Appendix BB provide the definition of walk-in equipment and the requirements for protecting persons therein.

1.1.2 Equipment not included in the scope of this document

Increase.

Add the following columns after item j).

aa) Heating, cooling and ventilation equipment for laboratories;

bb) Sterilization equipment.