Because of the scarcity of helium resources in China, we have long relied on imports, while the United States, as a major helium resource country, regards it as a strategic reserve and restricts its exports, leading to a continuous rise in the price of liquid helium. This price increase, as well as import restrictions, had a serious impact on the progress of our scientific research endeavours. As a result, the closed-cycle refrigerator was born. Its most typical feature is that it eliminates the need to consume expensive refrigerants, making low-temperature acquisition significantly less expensive. The closed-cycle thermostat has become the most commonly used sample cooling system in laboratories.

  CCV-4K series of closed-cycle thermostats, with more user-friendly design, especially the non-standard customisation of the sample holder part, meets the testing of electrical, optical, or optoelectronic properties of samples under low-temperature vacuum environment for different customers. It can be configured with a variety of different optical accessories and electrical connectors to meet the requirements of different experiments on sample cooling. Threaded holes on the bottom of the vacuum enclosure, matching the mounting flange of the stand, allow the thermostat to be fixed directly to the optical platform.

Features:

- Wide temperature range: from 4 K to 325 K (500 K or 800 K optional)
- Samples are cooled by thermal conduction in a vacuum.
- Large sample space with a wide range of holders for testing a wide range of films, blocks, powders and liquids.
- Aluminium vacuum enclosure and radiation shield with segmented design for quick sample changes
- 4 optical windows as standard (38mm)
- Equipped with multi-field temperature control system
- Supports standard optical, powder, liquid, resistive, probe and resistive sample holders, with a wide range of holders available.
- Fast cooling down to 5K in less than 1 hour.
- Sample chamber with quick release clamps for easy sample replacement.
- Vacuum enclosure with pre-drilled blind for a variety of electrical measurement configurations (e.g. SMA, BNC, tri-coaxial, multi-pin electrical vacuum feed-through phosphorus copper wire, very fine coaxial wire, semi-rigid microwave cable, etc.)