
LDHe
Measurement System
The LDHe Measurement System is a versatile helium system that allows you to conduct experiments down to 1 K or 0.5 K.
The LDHe Measurement System allows you to conduct experiments down to 1 K or 0.5 K. The different base temperatures depend on the helium isotopes used, with 1 K achieved using helium-4, and 0.5 K achieved with helium-3.
There are two different models of the system available: LD250He and LD400He. The key difference between these systems is the Gas Handling System used. The LDHe system can be upgraded to a Dilution Refrigerator Measurement System at any later stage.
Product Highlights
1.0
LDHe
1K System
Extensive Capabilities for Experimental Wiring
The system offers a variety of access ports between the Room Temperature Flange and Evaporator Flange for experimental wiring.
- 2 x ISO-K63 slotted in all flanges
- 5 x KF40 including central port
High, Continuous Cooling Power
The main advantage of the LDHe System is its Gas Handling System, which is of a robust size to provide the high and continuous cooling power of the system. In addition, the system can be operated with either helium-3 or helium-4. The typical base temperature, below 500 mK, is easily achievable with 7 liters of the helium-3 as an operational gas. Temperatures below 900 mK are achievable with helium-4.
Large Experimental Space
The Evaporator Flange diameter is 303 mm.
Upgrade to a Dilution Refrigerator Measurement System
The LDHe Measurement System is an LD System without the dilution unit. It is possible to upgrade it to a Dilution Refrigerator Measurement System at any later stage. The upgrade can be completed with an on-site installation in 3–4 days.
The LD250He model can be further upgraded to a full LD350 Dilution Refrigerator Measurement System, and the LD400He model to an LD450 System.
Temperature Controller
The Bluefors Temperature Controller enhances the user experience of our cryogenic systems. With a modern and intuitive user interface, you get direct control and overview of the temperature status of the system. The Bluefors Temperature Controller is fully integrated to the system.
Technical Specifications
2.0
LDHe
1K System
Note: The cooling power is measured on the Evaporator Flange. The cooldown time to base temperature is measured on an empty system with a standard experimental space and shield set. Note that with the different Gas Handling Systems, different operating temperatures can be reached with the helium-3 systems. The LD400He model can be operated up to ~0.9 K, whereas the LD250He model has an upper limit of 0.7 K.
| LD250He | LDHe (He-3) | LDHe (He-4) |
| Base temperature | 450 mK | 850 mK |
| Cooling power at 1 K | 30 mW | |
| Cooling power at 0.7 K | 15 mW | |
| Cooldown time | 12 h | 12 h |
| Evaporator Flange diameter | 303 mm | 303 mm |
| LD400He | LDHe (He-3) | LDHe (He-4) |
| | GUARANTEED | GUARANTEED |
| Base temperature | 450 mK | 850 mK |
| Cooling power at 1 K | | 30 mW |
| Cooling power at 0.7 K | 15 mW | |
| Cooldown time | 12 h | 12 h |
| Evaporator Flange diameter | 303 mm | 303 mm |
Options
3.0
LDHe
1K System
Faster turnaround options
Frame Options
Shield options
Gas Handling System options
Other options
Gas Handling System & Control Software Generation 2
Gas Handling System Generation 2
Our new Gas Handling System delivers next-level control with unprecedented ease-of-use, class-leading safety and enhanced reliability.
Control Software Generation 2
Control Software Generation 2 completely redefines the experience of controlling cryogenic measurement systems.
Related Products
Cryogenic Measurement System Options
We offer various options for our Cryogenic Measurement Systems to optimize them for different uses and experimental needs.
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Magnets
Bluefors offers a range of integrated, cryogen-free superconducting magnets for our cryogenic measurement systems.
Layout and Facility Requirements
4.0
LDHe
1K System
Layout Overview

Each of our systems is designed to be installed to a specific location defined in advance. A separate layout drawing is made for each Bluefors system, which should always be referred to for exact dimensions.
Facility Requirements
The basic requirements are 3-phase electricity, cooling water, and compressed air. The full list of requirements and specification details can be found in the Pre-Installation Guide, please contact our sales team for a copy.
See also
First Generation 2 Systems Installed at the University of Copenhagen
Gas Handling System Gen. 2 – Designed for Performance
Control Software Generation 2 – Cool Power at Your Fingertips
Cryomech PT310-RM Integrated Into Bluefors Dilution Refrigerators
1000th Bluefors system has been installed
Quantum Applications in the Bluefors Measurement System
Explore Our Services
Total System Care
Total System Care is tailored to your specific needs, with the features and services that are designed to best support your systems.
Customer Care
We support our customers throughout the lifetime of their system, providing dedicated care to find solutions for any issues.
Bluefors Lab
Bluefors Lab provides easy and convenient access to a cryogenic measurement system for startups, research groups, and other organizations.
Gas Handling System Upgrade
Bring all the advantages of our new Gas Handling System to older systems by upgrading to Gas Handling System Generation 2.
Pulse Tube Cryocooler Upgrade and Refurbishment
Our pulse tube cryocooler upgrade and refurbishment service helps you to maximize the performance of your systems and extend their lifetime.
Health Check
Health Check help you assess the health of your cryogenic measurement system, ensuring it operates at its best performance.
Training
We offer a training program to support users in operating and maintaining their systems throughout the lifetime of their Bluefors systems.
Relocation
Relocation service helps your when you need to move your lab and its cryogenic measurement systems to a new facility.
Spare Parts
Our spare part stock helps you to access genuine Bluefors parts quickly to maximize the uptime of your systems.

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