Model RDK-305D 0.4 Watt at 4.2K - Advanced 4 Kelvin Closed-cycle Refrigerator Systems

Sumitomo (SHI) 4 K Refrigerator

RDK-305D

0.4 Watt @ 4.2 K

These systems provide 0.4 Watts of cooling at a temperature of 4.2 K at the second stage and can reach a minimum temperature below 3.5 K (with no parasitic or experimental heat loads). The 0.4-Watt systems employ a smaller compressor and cold head than the 1-Watt systems. The compressor is available in an air-cooled version only, in conjunction with 10-meter long flexible gas lines. (Please see our Compressor page for more information.)

Characteristics:	Applications:
Refrigeration Capacity 0.4 W @ 4.2 K	Superconducting Magnet Cooling
Orientation Independent	Cryogenic Property Measurements
Push-button Operation	Cryopumps
	Cryogenic Shield Cooling
	Helium Recondensing
	Laboratory Cryostats

COLD HEAD MODEL RDK-305D

Specifications

Refrigeration Cycle	Modified Gifford-McMahon
Refrigeration Capacity	50 Hz 1^st stage: 15 W @ 40 K
(Vertical Position)	2^nd stage: 0.4 W @ 4.2 K
	60 Hz 1^st stage: 20 W @ 40 K
	2^nd stage: 0.4 W @ 4.2 K
Orientation	Any - Capacity Loss: Max 15/25% (2nd/1st)
Weight	Approximately 16 kg
Dimension	Approximately 180D x 294L x 512H (mm)
Maintenance Interval	10,000 hours
Compatible Compressor Unit Model	CNA-31C, CNA-31D

Specifications subject to change without notice.

Please click here to view the mechanical drawing and typical load map for the Cold Head Model RDK-305D 0.4 Watt @ 4.2 K refrigerator.

Table of Contents	Pages
Introduction	1
Sample in Vacuum Systems (SHI-4 series)	2, 3
Sample in Static Exchange Gas Systems (SHI-950 series)	4, 5
Application-specific Models - Neutron Scattering	6
Application-specific Models - Mössbauer Spectroscopy (SHI-850 series)	7, 8
Application-specific Models - Micro-manipulated Probe Station (CCR4-MMP series)	9
Application-specific Models - FTIR Optical Spectroscopy: Low Vibration Pulse Tube (PT-950-FTIR)	10
Custom Engineered and Specialized 4 K Closed Cycle Cryostat Systems	11
0.1 Watt @ 4.2 K Refrigerator from SHI (RDK-101D)	12, 13
0.4 Watt @ 4.2 K Refrigerator from SHI (RDK-305D)	14, 15
0.5 Watt @ 4.2 K Refrigerator from SHI (RDK-205D)	16, 17
1 Watt @ 4.2 K Refrigerator from SHI (RDK-408D2)	18
1.5 Watt @ 4.2 K Refrigerator from SHI (RDK-415D)	19
6 K Cryocooler from SHI (RDK-408S)	20, 21
0.1 Watt Compressor Unit from SHI (CNA-11)	22
0.4 Watt Compressor Units from SHI (CNA-31C, CNA-31D)	23
0.5 Watt Compressor Units from SHI (CKW-21)	24
1 Watt & 1.5 Watt Compressor Units from SHI (CSA-71 & F-50)	25
Pulse Tube Refrigerators	26

4 KelvinClosed Cycle Refrigerator Systemsfrom Janis and SHI

Sumitomo (SHI) 4 K Refrigerator

4 Kelvin
Closed Cycle Refrigerator Systems
from Janis and SHI