Closed-loop thermostat
The 4K series closed-circuit thermostats offer a wide temperature range from 4 K to 325 K (500 K or 800 K optional). Samples are kept in a vacuum and cooled by heat conduction. They feature ample sample space and can be combined with a variety of sample holders to test a variety of thin films, bulk materials, powders, and liquids. Four optical windows are standard.
Due to the scarcity of helium resources, the country has long relied on imports. The United States, a major helium producer, considers it a strategic reserve and restricts its export, leading to a continuous rise in liquid helium prices. This price increase, coupled with import restrictions, has severely impacted the progress of our scientific research. Consequently, the closed-cycle refrigerator was born. Its most notable feature is that it eliminates the need for expensive refrigerants, significantly reducing the cost of achieving low temperatures. Closed-cycle thermostats have become the most commonly used sample cooling system in laboratories.
Our 4K series closed-cycle thermostats feature a user-friendly design, particularly customizable sample holders, accommodating diverse customer needs for testing electrical, optical, or optoelectronic properties of samples in low-temperature vacuum environments. A variety of optical accessories and electrical connectors can be configured to meet the sample cooling requirements of various experiments. The bottom of the vacuum housing features threaded holes that accommodate bracket mounting flanges, allowing the thermostat to be directly secured to an optical table.
• Wide temperature range: 4 K to 325 K (500 K or 800 K optional)
• Samples are cooled in a vacuum using heat conduction
• Large sample space accommodates a variety of sample holders, allowing testing of a wide range of thin films, bulk materials, powders, and liquids
• Segmented aluminum vacuum housing and radiation shield facilitate rapid sample changes
• Standard optical windows with a 38 mm viewing range
• Equipped with a temperature control system
• Supports standard optical, powder, liquid, resistor, probe, and resistor sample holders; a variety of sample holders are available
• Fast cooling speed, down to 5 K in 1 hour
• Quick-release clamp design in the sample chamber facilitates sample replacement
• The vacuum housing includes a blanking plate for optional electrical measurement configurations (such as SMA, BNC, triax, multi-pin electrical vacuum feedthrough phosphor copper wire, ultra-fine coaxial cable, semi-rigid microwave cable, etc.)
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Closed-loop thermostat
The 1.5K series closed-cycle cryostats offer continuous temperature control from 1.5K to 325K. They feature ample sample space and can be fitted with a variety of sample holders, enabling testing of a wide range of thin films, bulk materials, powders, and liquids. The aluminum vacuum housing and radiation shield feature a segmented design for fast sample changes. Equipped with a closed-cycle refrigerator, the built-in heater and temperature sensor work in conjunction with an external thermostat to achieve temperature control.
Continuous Flow Thermostat
The continuous flow thermostat can achieve a wide temperature range: from 4K to 450K, and can reduce the temperature to ~2K. The sample is in a vacuum and is cooled by heat conduction. The sample space is large and can be equipped with a variety of sample holders to test various thin films, blocks, powders and liquid samples. The refrigerant consumption is low. Using liquid helium to cool from room temperature to 5K only consumes 0.4L of liquid helium, and using liquid nitrogen to maintain 80K consumes 0.1L/h. It comes standard with 4 optical windows.
Liquid nitrogen storage thermostat
Liquid nitrogen storage cryostat offers a wide temperature range from 78 K to 500 K (800 K optional, with pump-down down to ~65 K). Samples are cooled in a vacuum using heat conduction. The large sample compartment accommodates a variety of sample holders, allowing testing of a wide range of thin films, bulk materials, powders, and liquid samples. The 0.4 L liquid nitrogen storage capacity maintains low temperatures for up to 5 hours, and liquid nitrogen can be refilled without disrupting the experiment.