4K Closed Cycle Refrigerator Cryostats
Reliable 2-stage GM
or Low Vibration Pulse Tube

Cryogen Free with sample temperatures down to 1.5K

Closed cycle coolers allow cooling samples to 4K without using cryogens. Using a CRYO gas condenser and a mechanical vacuum pump, samples can be cooled to 1.5K and no liquid helium is needed.

SELECT THE COOLING POWER THAT YOU NEED

AT 4.2K = 0.1, 0.5, 1.0 or 1.5 Watts!

1.5K continuous operating temperature using internal condensing chamber

Refrigerator cooling power:
0.5 watt at 4.2K (1.0 or 1.5 watts at 4.2K optional)

• Operating temperature range: 1.5K to 325K

• Air or water cooled compressor

• Greater than 1.25 inch (31mm) inside diameter sample tube Larger sample tubes optional

• Top loading sample positioner assembly with vertical and rotational adjustment

Optical Cryostat
Cooled by 4K, 0.5 Watt refrigerator

Model REF-1771-4K Variable Temperature Optical Closed Cycle Cryogenic Refrigerator System:

• <4 to 325K operating temperature range

• Two stage GM (Gifford-McMahon)

• Air or Water Cooled compressor

• 10 m interconnecting hoses and control cable

• Cooling power: 0.50 Watts at 4.2K

• Initial cooldown time: 60 minutes to 4.2K

• (1) 2.12 inch dia. clear optical quartz window

large 66 degree clear view (f0.76)

• (3) 1.00 inch dia. clear optical quartz windows