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GB/T 46756-2025Liquid helium-free dilution refrigerator (English PDF)

无液氦稀释制冷机

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 2, 2025

Implementation date

July 1, 2026

Scope

GB/T 46756-2025 is the English-translated version of 无液氦稀释制冷机.

GB/T 46756-2025 is the Chinese standard "Liquid helium-free dilution refrigerator". Its scope clause reads: This document specifies the product classification and model naming, technical requirements, and inspection procedures for liquid helium-free dilution refrigerators (hereinafter referred to as "refrigeration units").

The rules, marking, packaging, transportation and storage, and the corresponding test methods are described. This document applies to the design, production, and application of refrigeration machines. Its clauses include terms and definitions.

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Document preview — GB/T 46756-2025

National Standard of the People's Republic of China

ICS: 27.200
Classification: J 73

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

Preface
1.Scope
2 Normative References
3.Terms and Definitions
4.Product Classification and Model Naming
4.1 Product Series
4.2 Model Naming
5.Technical Requirements
5.1 General Requirements
5.2 Performance Requirements
5.3 Safety Requirements
6.Test Methods
6.1 Test Conditions
6.2 Performance Test Methods
6.3 Electrical Safety Test Methods
7 Inspection Rules
7.1 Factory Requirements
7.2 Inspection Items
8.Marking, Packaging, Transportation and Storage 9.
8.1 Mark
8.2 Packaging
8.3 Transportation and Storage

1 Scope

This document specifies the product classification and model naming, technical requirements, and inspection procedures for liquid helium-free dilution refrigerators (hereinafter referred to as "refrigeration units").

The rules, marking, packaging, transportation and storage, and the corresponding test methods are described.

This document applies to the design, production, and application of refrigeration machines.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 151 Heat Exchangers

GB/T 2829 Periodic inspection sampling procedures and tables (applicable to the inspection of process stability)

GB/T 4798.1 Classification of Environmental Conditions - Classification of Environmental Parameter Groups and Grading of Severity - Part 1.Storage

GB 4824 Limits and methods of measurement for radio frequency interference characteristics of industrial, scientific and medical devices

GB/T 5013.3 Rubber-insulated cables with rated voltage of 450/750V and below - Part 3.Heat-resistant silicone rubber-insulated cables

GB/T 9237 Safety and Environmental Requirements for Refrigeration Systems and Heat Pumps

GB/T 9286 Paints and varnishes - Cross-cut test

GB/T 13306 Nameplates

GB/T 13384 General Technical Requirements for Packaging of Mechanical and Electrical Products

GB/T 17799.2 General standards for electromagnetic compatibility – Part 2.Immunity standards in industrial environments

GB/T 19022 Measurement Management System - Requirements for Measurement Processes and Measuring Equipment

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1

A refrigerator that uses superfluid 4He to dilute 3He without precooling with liquid helium to obtain milliKelvin-level low temperatures.

Note. The mixture of 3He and 4He is separated into a concentrated 3He phase and a diluted 3He phase. 3He atoms in the concentrated phase enter the diluted phase through the phase interface. The dilution process is accompanied by...

It absorbs heat to achieve a cooling effect, generating a milliKelvin-level low-temperature environment in the mixing chamber.

3.2 mixing chamber

Components containing the 3He and 4He dilution phase interfaces.

3.3 Mixing chamber plate

A thin-plate planar component used to install the cooled device at the lowest temperature point of the mixing chamber in a dilution refrigeration unit.

3.4 effective cooling capacity

The cooling capacity provided to the load by the mixed chamber cold plate at a temperature of 100mK. […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 14 pages — is available in the English PDF.

Referenced standards

Normative references

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