Comprehensive Introduction to 4K Closed Loop Thermostat

Janis Research offers a variety of 4K refrigerators, 4K closed-loop thermostats - samples in vacuum 4K closed-loop thermostats - samples in static gas 4K closed-loop low vibration thermostats 4K closed-loop thermostats - neutron scattering 4K closed-loop thermostats - Mossbauer spectroscopy 4K low vibration pulse tube thermostats - FTIR application 4K closed-loop thermostats - customer customization Janis and SHI's 4K refrigerant free closed-loop thermostats. Why consider using a 4K thermostat? The 4K low-temperature thermostat allows you to cool samples, devices, or equipment without the inconvenience and cost of liquid helium. it

Janis Research offers a variety of 4K refrigeration units

4K Closed Loop Thermostat - Sample in Vacuum

4K Closed Loop Thermostat - Sample in Static Gas

4K closed-loop low vibration thermostat

4K Closed Loop Thermostat - Neutron Scattering

4K closed-loop thermostat - M ö ssbauer spectroscopy

4K Low Vibration Arterial Pulse Tube Thermostat FTIR Application

4K Closed Loop Thermostat - Customer Customization

Janis and SHI's 4K Refrigerant Free Closed Loop Thermostat

Why consider using a 4K thermostat?

The 4K low-temperature thermostat allows you to cool samples, devices, or equipment without the inconvenience and cost of liquid helium. They can be widely applied in research and industry. Some typical applications include materials research, superconductivity, cryogenic pumps, shroud cooling, and helium recondensation.

How does a 4K low-temperature cooler work?

The two-stage Gifford McMahon (GM) refrigeration system has been widely used for decades. Room temperature helium gas is first compressed and then supplied to the cold head through flexible transport pipelines. Compressed helium gas is cooled by expansion and provides cooling for the two heaters on the cold head. After the refrigeration machine cools down, the gas returns to the compressor to repeat the cycle.

The pulse tube (PT) refrigeration system uses a similar compression/expansion cycle, but eliminates the mobile heat storage chamber found in conventional refrigeration machines. Compared to GM systems, PT cryogenic coolers typically have reduced vibration levels at the vacuum interface flange. Refer to the three main differences between PT low-temperature cooler and GM low-temperature cooler.

The Sumitomo Heavy Industries (SHI) 4K low-temperature thermostat uses rare earth heat exchanger materials and has improved GM cycle and PT configuration. These materials can maintain useful heat capacity at temperatures below 4 K, resulting in basic temperatures that were previously unavailable in two-stage cryogenic coolers.

Is a 4K low-temperature thermostat economical and practical?

Before the introduction of the 4K low-temperature thermostat, liquid helium was most commonly used to cool equipment and experiments to 4K. The following figure shows the operating costs of a typical liquid helium cooling device (excluding evaporation losses from storage Dewar flasks). In some cases, the full cost of the 4K thermostat can be recovered in the first year!

Why choose Janis Research?

Janis Research is a distributor of 4K GM refrigerators manufactured by SHI Low Temperature Division. Janis is not only a distributor, but also SHI's preferred partner for low-temperature thermostats, and has been manufacturing low-temperature equipment for over 50 years. Our team of engineers and designers includes many highly educated individuals with over 200 years of comprehensive experience in the field of low-temperature technology. This experience and innovation won the 1998 R&D 100 Award and two NASA Public Service Group Achievement Awards.

What does our experience mean to you?

It enables us to create complex yet easy-to-use system designs, and can be customized according to your specific application requirements. We can guide you in selecting the available range and help you choose the 4K refrigeration unit or complete system that is suitable for you. Please refer to the link above to learn about the possibilities of various low-temperature coolers. Contact Yihong sales engineers for assistance in selecting products that are suitable for your application and budget.