
LD-4K
Measurement System
The LD-4K Measurement System is a versatile system for performing experiments at 4 K with a fast turnaround.
The LD-4K system is a versatile measurement system based on the Bluefors LD Dilution Refrigerator Measurement System. The system can be cooled from room temperature to base temperature simply by starting the pulse tube compressors. Its versatility makes it suitable for many different experimental needs.
Superconducting magnets can be easily integrated into the measurement system, and the system can be upgraded to a Dilution Refrigerator Measurement System at a later stage.
Product Highlights
1.0
LD-4K
4K System
Simple Operation
The system can be cooled from room temperature to base temperature simply by starting the pulse tube compressors.
Extensive Capabilities for Experimental Wiring
The system has several access ports for experimental wiring between the Room Temperature and the Base Flanges.
• 2 x ISO-K63 slotted in all flanges
• 5 x KF40 including central port
Large Experimental Space
Base Flange diameter: Ø 330mm
Upgradeable to a Dilution Refrigerator Measurement System
The LD-4K System is an LD System without the dilution unit and the Gas Handling System. However, the LD-4K System gives you the possibility to upgrade to a Bluefors Dilution Refrigerator Measurement System at a later stage. Upgrading only requires 3–4 days for on-site installation.
Temperature Controller
The Bluefors Temperature Controller enhances the user experience of our cryogenic systems. With a modern and intuitive user interface, you gain direct control and overview of the temperature status of the system.
Technical Specifications
2.0
LD-4K
4K System
Note: Base flange diameter is measured with a standard experimental space and shield set. The cooldown time to base temperature is measured on an empty system with standard experimental space and shield set.
| LD-4K | PT415-ENH | PT425-ENH | PT310-ENH |
|---|---|---|---|
| Base temperature | < 3.2 K | < 3.2 K | < 3.0 K |
| Cooling power at 2nd stage at 4.2 K | 1.35 W | 2.35 W | |
| Cooling power at 2nd stage at 3 K | 0.9 W | ||
| Cooling power at 4K Flange at 3 K without experimental load | ~50 mW | ~400 mW | ~500 mW |
| Cooling power at 4K Flange at 5 K without experimental load | ~1000 mW | ~1500 mW | ~1000 mW |
| Cooling time | < 8 hrs | < 7 hrs | < 7 hrs |
| Base flange diameter | 330 mm | 330 mm | 330 mm |
Options
3.0
LD-4K
4K System
Faster turnaround options
Frame Options
Shield options
Other options
Related Products
Cryogenic Measurement System Options
We offer various options for our Cryogenic Measurement Systems to optimize them for different uses and experimental needs.
Measurement Infrastructure
Bluefors offers fully-integrated, scalable measurement infrastructure to provide the most reliable turnkey setups for quantum applications.
Magnets
Bluefors offers a range of integrated, cryogen-free superconducting magnets for our cryogenic measurement systems.
Layout and Facility Requirements
4.0
LD-4K
4K 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.
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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