The Omniplex: CS204*F-FMX-19OP is a top loading optical cryostat with the ARS manufactured DE-204 for high cooling power and fast cooldown. The helium vapor is particularly useful for cooling samples that do not conduct heat well.
The ARS Omniplex systems feature large optical access, quick sample change, fast initial cooldown (90 minutes to 20 K), and adjustable radiation baffles to optimize sample temperatures.
The Omniplex: CS204*F-FMX-19OP comes with 4 window ports and with warm and cold windows. A variety of options allow this system to be customized to fit the researcher's needs, including custom tail pieces, load-lock gate valves and low vibration interfaces.
The sample stick can use any of the standard ARS sample holders, as well as receive a second set of temperature control instrumentation for fine tuning of the sample temperature.
- UV, VIS, IR
- Raman spectroscopy
- Deep-level transient spectroscopy (DLTS)
- Hall probe experiments
- Diamond anvil cell
- Liquid samples
- Thermal, electrical and magnetic susceptibility
- Low vibration applications with bellows
- Cryogen free
- Top loading sample in vapor, fast sample change
- Welded stainless steel vacuum chamber
- Multiple tail piece adaptations
- Large, clear view optical windows (1.5" outer, 0.7" cold windows)
- Large sample viewing angle for optical collection (F/1.9)
- Fully customizable
- Cold head (DE-204AF)
- Compressor (ARS-4HW)
- 2 helium hoses
- Omniplex, sample in vapor vacuum chamber
- Optical tail piece with 4 window ports
- OFHC copper radiation shield
- 2 high purity quartz windows
- 2 sapphire cold windows
- Instrumentation for temperature measurement and control:
- 10 pin hermetic feedthrough
- 50 ohm thermofoil heater
- Silicon diode sensor curve matched to (± 0.5 K) for control
- Calibrated silicon diode sensor (±12 mK) with 4 in. free length for accurate sample measurement
- Wiring for electrical experiments:
- 10 pin feedthrough
- 4 copper wires
- Sample holder for electrical experiments
- Temperature controller
Options and Upgrades
- 180° Kapton window for x-ray diffraction (see secondary image)
- Soft rubber bellows for low sample vibrations
- VSM adapter
- Load-lock gate valve
- 4 K cold head (0.2 W @ 4.2 K)
- 5.5 K cold head (3 W @ 10 K)
- Turbo upgrade for faster cooldown times
- 450 K high temperature interface
- 800 K high temperature interface
- Second set of temperature control instrumentation for fine sample temperature control
- Custom temperature sensor configuration (please contact our sales staff)
- Custom wiring configurations (please contact our sales staff)
- Window material upgrades (custom materials available)
- Sample holder upgrades (custom sample holders available)
The ARS Advantage
The DE-204SF cold head is a precision machine carefully tuned to achieve temperatures below 4 K with 0.2 W of cooling power at 4.2 K.
The DE-204AFcold head is a rugged workhorse built with power and durability in mind, achieving temperatures below 9 K with 2 W of cooling power at 10 K.
The DE-204PF 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 3 W of cooling power at 10 K.
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.
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 50 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.
Whether the measurement is optical or electrical in nature, the sample large or small, we have a sample holder for almost any measurement. The CS204*F-FMX-19OP can accept all but our largest sample holders. Like all of our cold fingers, the Omniplex Sample Stick has a 1/4-28 threaded hole on the cold tip to mount the sample holder. So even if you do not find what you need from our wide variety of sample holders there is always the option of attaching a custom sample holder.
The water cooled ARS-4HW compressor that powers the DE-204 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.
The ARS DE-204 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.
Omniplex: FMX-19OP Specifications
|DE-204||Closed Cycle Cryocooler
|Refrigeration Type||Pneumatically Driven Gifford-McMahon Cycle|
|Liquid Cryogen Usage||None, Cryogen Free|
|DE-204AF||< 10 K - 350 K
Interface temperature may be 1-2K higher
|DE-204SF||< 4.2 K - 350 K
Interface temperature may be 1-2K higher
|DE-204PF||< 6 K - 350 K
Interface temperature may be 1-2K higher
|With 800 K Interface||(Base Temp + 2 K) - 800 K|
|With 450 K Interface||(Base Temp + 2 K) - 450 K|
|*Based on bare cold head with a closed radiation shield, and no additional sources of experimental or parasitic heat load.|
|Diameter||49, 36 mm (1.94, 1.44 in)|
|Height||47 - 190 mm (1.86 - 7.5 in) Variable|
|Sample Holder Attachment||1/4-28 screw|
|Sample Holder||View our Sample Holder Collection|
|Window Ports||4 - 90° Apart|
|Diameter||50.8 mm (2 in) Outer window|
|Clear view||38 mm (1.5 in) Outer Window
17mm (0.7 in) Inner Cold Window
|Window Material||View our Wide Selection of Window Materials|
|Temperature Instrumentation and Control (Standard)-|
|Heater||1 - 50 ohm Thermofoil Heater Anchored on Cold Tip|
|Control Sensor||1 - Curve Matched Silicon Diode|
|Sample Sensor||1 - Calibrated Silicon Diode
Optional Second set of Control instrumentation on Sample Stick
|Custom Instrumentation||Contact ARS for available Options|
|Instrumentation Skirt||Welded, Stainless Steel|
|Pump out Port||1 - NW-25|
|Instrumentation Wiring||Contact our sales staff for wiring options|
|Length||190 mm (7.5 in) At the Tail Piece|
|Diameter||89, 83 mm (3.5, 3.25 in) (at the sample space)|
|Width||107, 97 mm (4.2, 3.8 in) (at the sample space)|
|Optical Access||0, 2, or 4(customer specified)|
|Overall Length||725 mm (28.5 in)|
|Motor Housing Diameter||114 mm (4.5 in)|
|Rotational clearance||Contact our Sales Staff|
|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 K||< 4 K|
|Cooling Capacity-||4.2 K||-||-||-||-||-||-||0.2 W||0.16 W|
|10 K||2 W||1.6 W||2.7 W||2.2 W||3 W||2.4 W||4 W||3.2 W|
|20 K||9 W||7.2 W||12 W||9.6 W||8 W||6.4 W||8 W||6.4 W|
|77 K||17 W||14 W||23 W||18.4 W||14 W||11 W||14 W||11 W|
|Radiation Shield Cooling Capacity||18 W||14 W||24 W||19 W||18 W||14 W||18 W||14 W|
|(1st Stage Cooling Capacity at 77 K)|
|Maximum Cylinder Temperature||355 K||355 K||355 K||355 K|
|Cooldown Time-||20K||30 min||36 min||25 min||30 min||40 min||48 min||40 min||48 min|
|Base Temperature||60 min||72 min||50 min||60 min||90 min||96 min||90 min||108 min|
|Weight||Expander||7.7 kg (17 lbs)||7.7 kg (16 lbs)||7.7 kg (16 lbs)||7.1 kg (16 lbs)|
|Standard Voltage||Min||208 V||208 V||208 V||190 V||208 V||208 V||208 V||190 V|
|Max||230 V||220 V||230 V||210 V||230 V||220 V||230 V||210 V|
|Power Usage||Singe Phase||3.6 kW||3.0 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||73 kg (137 lbs)||73 kg (160 lbs)||73 kg (137 lbs)||73 kg (160 lbs)|
|Typical Maintenance Cycle||12,000 hours||8,000 hours||12,000 hours||12,000 hours|
Omniplex Top Loading Optical Cryostat
Omniplex top view
Omniplex Sample Stick
Click on the images for full size.