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Low-Temperature EPR Cryostat: CS202I-DMX-15

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Low-Temperature EPR Cryostat: CS202AE-DMX-15 Closed Cycle Cold Head for Low-Temperature EPR and ESR Experiments
 Low-Temperature EPR Cryostat: CS202AE-DMX-15 Disassembled

The CS202I-DMX-15 offers high vacuum capability for low-temperature Electron Paramagnetic Resonance (EPR) and Electron Spin Resonance (ESR) experiments. The o-ring design on the quartz cuvette provides for easy sample change without having to disassemble the system. There is a choice of either a sapphire or copper sample rod.

The Low-Temperature EPR Cryostat is powered by our DE-202 series closed cycle cryocooler. This liquid helium free cryostat uses a pneumatically driven Gifford-McMahon cycle to extract heat from the system.

Applications
  • Electron Paramagnetic Resonance (EPR)
  • Electron Spin Resonance (ESR)
Features
  • Cryogen free
  • Stainless steel vacuum shroud and Instrumentation skirt for high vacuum.
  • Quartz tube removable by o-ring for easy sample access
  • Sample holder threads on for easy sample change
  • Fully customizable
Typical Configuration
  • Cold head (DE-202AI)
  • Compressor (ARS-4HW)
  • 2 helium hoses
  • Stainless steel vacuum shroud with quartz tube removable by o-ring
  • Nickel plated copper radiation shield
  • 2 high purity quartz windows
  • Instrumentation for temperature measurement and control:
    • 10 pin hermetic feedthrough
    • 36 ohm thermofoil heater
    • Silicon diode sensor curve matched to (± 0.5 K) for control
    • Calibrated Cernox sensor (±12 mK) with 4 in. free length for accurate for sample measurement
  • Sapphire or copper sample holder
  • Temperature controller
Options and Upgrades
  • 4 K cold head (0.1 W @ 4.2 K)
  • 5.5 K cold head (1 W @ 10 K)
  • Turbo upgrade for faster cooldown times
  • High temperature interface
  • Very high temperature interface
  • Custom temperature sensor configuration (please contact our sales staff)
  • Custom wiring configurations (please contact our sales staff)

The ARS Advantage

4 K, 5.5 K, 10 K Fine-Tuned For Your Temperature Range
A Selection of ARS Manufactured Displex Cold Heads

The DE-202SE cold head is a precision machine carefully tuned to achieve temperatures below 4 K with 0.1 W of cooling power at 4.2 K.

The DE-202AEcold head is a rugged workhorse built with power and durability in mind, achieving temperatures below 9 K with 0.5 W of cooling power at 10 K.

The DE-202PE cold head is a hybrid of the the 4 K and 10 K philosophies, achieving a balance that exhibits the best of both worlds, with temperatures below 5.5 K and 1 W of cooling power at 10 K.

High Temperature Options
800K Interface Manufactured by ARS

Our high temperature interfaces use a unique combination of mechanical and thermodynamic properties to create a high temperature thermal disconnect between the cold head and the sample space. This allows for heating of the sample space far in excess of the maximum 355 K temperature of our cryocoolers.

450 K The Easy Way

Our 450 K interface is a simple semi-permanent addition to the cold tip that expands the upper sample temperature range by 95 K utilizing most of the same instrumentation as our standard cryocoolers.

800 K - Pouring on the Heat

Our specially designed 800 K interface goes beyond the standard techniques to provide a unique system that maximizes thermal conduction at low temperatures while minimizing heat transfer at high temperatures. Beyond the safe operating temperature of silicon diodes, the standard sensors are replaced with E-type thermocouples and platinum RTDs.

Wired the Right Way - Your Way
Thermally Anchored Sensor Wiring on the DE-202 Cold Tip

Our technicians painstakingly wrap each cold head for optimum thermal anchoring. We offer you the choice of a variety of wiring options, from our standard offerings of single strand copper and low noise coaxial wiring packages to any number of custom wiring configurations.

Typical instrumentation for temperature measurement and control include one 36 ohm thermofoil heater, one curve matched silicon diode for rough temperature control, and one free length calibrated diode for direct attachment to the sample or sample holder for accurate temperature measurement. Silicon diode sensors are favored heavily for most standard applications because of their low cost, durability, and stability, but we do offer a wide variety of other sensors for different applications such as Cernox sensors for high magnetic fields, E-type thermocouples for 4 K-800 K measurements, and platinum RTDs for accurate high temperature measurements.

Our wide selection of wiring and instrumentation is matched by an equally wide selection of temperature controllers from Cryocon, Lake Shore, and Scientific Instruments.

Water Cooled Compressor For Your Convenience
The ARS-2HW Compressor

The water cooled ARS-2HW compressor that powers the DE-202 Series cold heads has many benefits that are amplified in small laboratory settings. The water cooling redirects heat energy that would otherwise be dumped into the lab by a large cooling fan. The lack of a large cooling fan also dramatically reduces the noise of these compressors (only 60 dBA). Additionaly with minimum air circulation, the air currents and dust are kept to a minimum. The high efficiency heat exchanger results in low water usage and saves space inside the compressor, giving it a small footprint. When water is not available our Coolpac™ remote recirculation system can send cooling water from up to 100 feet away.

Easy Do-It-Yourself Maintenance
DE-202 Disassembled for Service

The ARS DE-202 Closed Cycle Cryocooler operates on a pneumatically driven Gifford-McMahon refrigeration cycle that is both mechanically simple and robust.

12,000-Hour Maintenance Cycle

Over time the internal components of the cold head begin to wear. Eventually the performance of the cold head will decline and some time after 12,000 hours certain internal components need to be replaced or refurbished. With most closed cycle cryocoolers the only option is to send the cold head back to the manufacturer for service.

A Second Option

The simplicity of the ARS pneumatically driven cryocooler allows for another option. Our customers can purchase a service kit for our 10 K and 5.5 K cryocoolers that replaces all of the worn components. This service kit can be ordered ahead of time and reduce down time to a matter of hours instead of weeks.

DMX-15 Specifications

Cooling Technology-
  DE-202 Closed Cycle Cryocooler
  Refrigeration Type Pneumatically Driven Gifford-McMahon Cycle
  Liquid Cryogen Usage None, Cryogen Free
Temperature*-
  DE-202AE < 10 K - 350 K
  DE-202SE < 4.2 K - 350 K
  DE-202PE < 5.5 K - 350 K
  With 800 K Interface (Base Temp + 2 K) - 700 K
  With 450 K Interface (Base Temp + 2 K) - 450 K
  Stability 0.1 K
  *Based on bare cold head with a closed radiation shield, and no additional sources of experimental or parasitic heat load.
Sample space-
  Diameter 8 mm (.315 in)
  Height 101.6 mm (4.25 in)
  Sample Holder Attachment 1/4-28 screw
  Sample Holder View our Sample Holder Collection
Optical Access-
  Window Ports Quartz Tube
  Diameter 10.2mm OD (.401)
  Clear view 360°
  #/F N/A
  Window Material View our Wide Selection of Window Materials
Temperature Instrumentation and Control (Standard)-
  Heater 1 - 36ohm Thermofoil Heater Anchored on Cold Tip
  Control Sensor 1 - Curve Matched Silicon Diode
  Sample Sensor 1 - Calibrated Cernox Sensor
  Custom Instrumentation Contact ARS for available Options
Instrumentation Access-
  Instrumentation Skirt Welded Stainless Steel
  Pump out Port 1 - NW-25
  Instrumentation Ports 3
  Instrumentation Wiring Contact our sales staff for wiring options
Vacuum Shroud-
  Material Stainless Steel
  Length 338 mm (13.3 in)
  Diameter 76 mm (3 in) (at the sample space)
  Width 76 mm (3 in) (at the sample space)
Radiation Shield-
  Material Nickel Plated Copper
  Attachment Threaded
  Optical Access 1 (on the top for the sample holder to extend through)
Cryostat Footprint-
  Overall Length 711 mm (28 in)
  Motor Housing Diameter 114 mm (4.5 in)
  Rotational clearance 200 mm (8 in) with "G" configuration

Cryocooler Specifications

Cryocooler Model DE-202AI DE-202A(T)I DE-202PI DE-202SI
  Frequency 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz
    Base Temperature < 9 K < 9 K < 9 K < 9 K < 5.5 K < 5.5 K < 4.2 K < 4.2 K
    Cooling Capacity- 4.2 K - - - - - - 0.1 W 0.08 W
  10 K 0.5 W 0.4 W 0.7 W 0.56 W 1 W 0.8 W 1.2 W 1 W
  20 K 2.5 W 2 W 3.7 W 3 W 2.3 W 1.8 W 2.3 W 1.8 W
  77 K 4 W 3.2 W 6 W 4.8 W 3.5 W 2.8 W 4 W 3.2 W
    Radiation Shield Cooling Capacity 10 W 8 W 15 W 12 W 10 W 8 W 10 W 8 W
       (1st Stage Cooling Capacity at 77 K)                
    Maximum Cylinder Temperature 355 K 355 K 355 K 355 K
    Cooldown Time- 20 K 50 min 60 min 35 min 42 min 60 min 72 min 60 min 72 min
  Base Temperature 70 min 84 min 50 min 60 min 90 min 108 min 90 min 108 min
    Weight Expander 7.1 kg (16 lbs) 7.1 kg (16 lbs) 7.1 kg (16 lbs) 7.1 kg (16 lbs)
Compressor Model ARS-2HW ARS-4HW ARS-2HW ARS-4HW
    Standard Voltage Min 208 V 208 V 208 V 190 V 208 V 190 V 208 V 190 V
  Max 230 V 220 V 230 V 210 V 230 V 210 V 230 V 210 V
    Power Usage Singe Phase 1.3 kW 1.2 kW 3.6 kW 3.0 kW 3.6 kW 3.0 kW 3.6 kW 3.0 kW
    Dimensions: L 483 mm (19 in) 483 mm (19 in) 483 mm (19 in) 483 mm (19 in)
  W 434 mm (17.1 in) 434 mm (17.1 in) 434 mm (17.1 in) 434 mm (17.1 in)
  H 516 mm (20.3 in) 516 mm (20.3 in) 516 mm (20.3 in) 516 mm (20.3 in)
    Weight Compressor 62 kg (137 lbs) 73 kg (160 lbs) 73 kg (160 lbs) 73 kg (160 lbs)
    Typical Maintenance Cycle 12,000 hours 8,000 hours 12,000 hours 12,000 hours
DE-202*I Closed Cycle Cold Head with Welded Instrumentation Skirt

DE-202*I
Cold Head with Welded Instrumentation Skirt

DMX-15 Sample Space For EPR Experiments Drawing

DMX-15 For Low-Temperature EPR
Sample Space

ARS-2HW Compressor Drawing

ARS-2HW
Water Cooled Compressor

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