GB/T 42125.2-2024Safety requirements for electrical equipment for measurement, control and laboratory use - Part 2: Particular requirements for laboratory equipment for the heating of materials (English PDF)

Foreword

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 2 of GB/T 42125 "Safety requirements for electrical equipment for measurement, control and laboratory use". GB/T 42125 has been the following parts have been published.

--- Part 1: General requirements;

--- Part 2: Particular requirements for laboratory equipment for material heating;

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

--- Part 4: Special 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 17: Particular requirements for equipment used by children in educational institutions;

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

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

This document replaces GB 4793.6-2008 "Safety requirements for electrical equipment for measurement, control and laboratory use Part 6: Laboratory material Compared with GB 4793.6-2008, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

---Added additional instructions for equipment using flammable liquid heat transfer media (5.4.101);

--- Added drying time requirements (6.7.2.2.101);

--- Added requirements for equipment containing or using flammable liquids (9.5);

--- Added cleaning requirements (11.2);

--- Added insulation requirements not covered in 6.7 (Appendix K).

This document is equivalent to IEC 61010-2-010:2019 "Safety requirements for electrical equipment for measurement, control and laboratory use Part 2-010 Part 1: Particular requirements for laboratory equipment for heating materials.

The following minimal editorial changes were made to this document.

--- In order to coordinate with the existing standards, the name of the document is changed to "Safety requirements for electrical equipment for measurement, control and laboratory use Part 2.

Particular requirements for laboratory equipment for heating materials.

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 material heating equipment.

Security 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 laboratories Require.

--- Part 4: Special requirements for climate and environmental tests and 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 hand-held 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 50V or DC 120V or above.

--- Part 11: Particular requirements for sterilizers and cleaning and disinfecting equipment 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 and agitation equipment used for mechanical stirring and agitation.

Particular safety requirements for laboratory equipment and its accessories.

--- Part 13: Particular requirements for laboratory atomic spectrometers with thermal atomization and ionization. The purpose is to specify the requirements for laboratory atomic spectrometers with thermal atomization and ionization.

Particular safety requirements for atomic spectrometers for atomization and ionization.

--- 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 equipment used by student operators in educational institutions.

Particular safety requirements for 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 Special 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 61010-2-010, together with IEC 61010-2-011 and IEC 61010-2-012, covers the application of equipment to heat 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 describes the hazards associated with combined equipment that contains both heating and cooling systems and the two systems interact with each other.

equipment and heating or cooling systems alone; this document also addresses other requirements Hazards associated with handling materials exposed to elements such as radiation, high humidity, carbon dioxide and mechanical movement Guidelines for the correct selection of 3 related documents for equipment that only includes material heating systems and does not include cooling systems or other environmental factors, it is necessary to meet IEC 61010-2-010 requirements, it is not necessary to meet the requirements of IEC 61010-2-011 and IEC 61010-2-012; similarly, for a system that only includes a refrigeration system and does not include Equipment for material heating systems or other environmental factors shall meet the requirements of IEC 61010-2-011 and need not 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 when handling materials that introduce significant amounts of heat into the refrigeration system, the selection process is more likely to be different than evaluating the two systems separately (controlling temperature, see Figure 102).

If the heating and cooling functions interact with each other, it is necessary to determine whether additional or more severe hazards may result.

If the use of the two functions 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 processing elements for materials, 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.

---Maximum temperature on the low-pressure side of the motor-compressor (return air temperature). The motor-compressor uses refrigerant to cool the motor.

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

--- 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 and provide 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 dangerous temperature changes.

--- Maximum pressure at the outlet of the high-pressure side of the motor-compressor. from the refrigerant components downstream of the motor-compressor to the expansion device the components are directly subjected to the pressure, so the design ratings of these components must ensure that they can withstand the pressure under the most adverse conditions and provide 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 this 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 for 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 refrigeration system including 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 as "replaced" or "modified" indicates that the terms of this document shall prevail; the part marked as "added" in this document indicates that in addition to complying with in addition to the corresponding clauses of GB/T 42125.1-2024, the additional clauses in this document must also be complied with.

2024, the number of the clauses added to this document begins with 101, such as 3.1.101, and the number of the appendices added to this document begins with AA, such as such as Appendix AA and Appendix BB.

Electrical equipment for measurement, control and laboratory use Safety requirements Part 2: Materials for heating Special requirements for laboratory equipment

1 Scope and purpose

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

2 Normative references

Except for the following contents, Chapter 2 of GB/T 42125.1-2024 is applicable.

Increase.

Add the following references.

GB/T 42125.1-2024 Safety requirements for electrical equipment for measurement, control and laboratory use Part 1: General requirements (IEC 61010-1:2016, IDT) ISO 7010 Graphical symbols - Safety colours and safety marks Registered safety marks Note. GB/T 31523.1-2015 Safety information identification system Part 1: Signs (ISO 7010:2011, MOD)