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Home / Mechanically Refrigerated Thermal Platforms and Cryo-Plates

MRTP thermal platform systems rely upon a closed loop mechanical refrigeration cooling system. This eliminates the need for expendable refrigerants such as liquid nitrogen and liquid carbon dioxide. Eliminating the non-reusable refrigerants also eliminates the purchasing cost and handling expenses, not to mention the associated icing and water condensation.

The MRTP utilizes an efficient mechanical refrigeration system that re-circulates the refrigerant in a closed loop system. Only environmentally friendly zero-ozone depleting refrigerants are used. Proprietary design features provide fast ramp rates with efficient heat removal. The system is portable and a single AC outlet is all that is needed to operate it. The system normally uses an air-cooled condenser, which rejects a certain amount of heat into the room. If a water cooling source is available, the system can operate with a water-cooled condenser. If many systems will operate in the same room a water cooling circuit should be considered to remove the heat rejected by the refrigeration cycle.

There are two types of MRTP systems:

Single Stage

Rapid heating and cooling rates down to -25°C and a range to -35°C. Single Stage MRTP systems heat and cool a thermal platform very efficiently. They have rapid heating with good cooling rates down to about -20°C or -25°C. They will cool down below -35°C but the rate of change decreases rapidly below -20°C or -25°C. This is because a single stage system uses a single compressor and a single type of refrigerant. The refrigerant used has a boiling point near -40°C. Once the temperature differential between the thermal platform and refrigerant is less than 10°C then thermal transfer is slower and the platform cools much less rapidly.

Cascade

Rapid heating and cooling rates down to -55°C and a range to -65°C. Cascade MRTP systems heat and cool a thermal platform very efficiently. They have rapid heating with good cooling rates down to about -50°C or -55°C. They will cool down below -65°C but the rate of change decreases rapidly below -50°C or -55°C. This is because the refrigerant used has a boiling point near -70°C. Once the temperature differential between the thermal platform and refrigerant falls below 10C, then thermal transfer is slower and the platform cools much less rapidly. A cascade system uses two compressors and two different types of refrigerant. This allows it to economically and reliably reach temperatures that are much lower than a single stage system is able to achieve.

Depending on the use or the space intended for the MRTP, two configurations are available. A flexible umbilical connects the thermal platform to the chiller cabinet or the platform is attached to the front of the cabinet and integrated into a work shelf.

Benefits:
  • No need for LN2 or LCO2 SO purchasing and handling expenses are eliminated.
  • Only a simple AC outlet is required to run the MRTP system.
  • The system is small, lightweight and portable.
  • Single Stage System have rapid heating and cooling rates down to -25°C and a range to -35°C.
  • Cascade Systems have rapid heating and cooling rates down to -55°C and a range to -65°C.
Features:
  • µp based digital control
  • Cascade control software
  • Additional user device probe
  • Programmable ramp & soak profiling
  • Environmentally friendly refrigerants
  • Programmable ramp to set point
  • Fast thermal ramp rates
  • Flexible platform positioning with use of umbilical cord
  • Simple robust design and construction
  • Quiet efficient operation
  • EIA 232 and IEEE-488 GPIB interfaces

Product Information:

Thermal Platform Sizes:
  • 6-3/4" x 6-3/4"
    (170mm x 170mm)
  • 6-3/4" x 13-1/4"
    (170mm x 335mm)
  • 10" x 15"
    (250mm x 375mm)
  • 11"x 11"
    (280mm x 280mm)
  • Optional sizes also available as
    3.375" x 6-3/4", 11" x 22"
    and 24" x 24"
Standard Cabinet Dimensions:
  • 28" wide x 28" deep x 35" tall
    (710mm x 710mm 890mm)
Portability:
  • Easily moved on four castors
Refrigerants:
  • Non CFC zero ozone depletion HFC type
Thermal Platform:
  • High strength aluminum alloy
Heating:
  • Resistance AC element
Cooling:
  • Expansion of refrigerant
Platform Surface:
  • Ground for flatness and plated for durability
Control Method:
  • Pulsed width modulation with proportional, integral, derivative control techniques
Fixturing:
  • Four ¼ 20 stainless steel threaded inserts in platform
Platform to Cabinet Interface:
  • Single six foot 2 - ½ diameter insulated umbilical cord with flexible conduit or direct mount
Compressor:
  • Fully hermetic type
Condenser:
  • Fan - cooled tube and fin ( optional water cooled)
Expansive Device:
  • Thermostatic type (TXV)
Evaporator:
  • Silver-brazed aluminum and copper alloy
Compressor Management:
  • Hot gas bypass, liquid injection and pressure controlled
Platform Chassis:
  • Corrosion resistant, stainless steel sheet metal construction
Failsafe:
  • Redundant independent latching safety systems
Cabinet:
  • Powder coated sheet metal construction with locking castors
Condensing Unit Base:
  • Corrosion resistant powder coated steel
Facilities Requirements:
  • Varies based on system ordered
Remote Communications :
  • Standard EIA 232 serial communications or optional IEEE-488 GPIB interface
Temperature Range:
  • Single stage system: -30°C to + 130°C or cascade system: -60°C to +130°C
Thermal Ramp Rate:
  • Varies based on mass and load of device under test. No load rate can be as fast as 30°C/minute

To address special requirements we are able to offer several accessories for the MRTP systems.

Accessories are available such as:


Adapter Plate

Dry Box Desiccator

Hold Down Clamp

Low Pressure Nitrogen Purge Kit

High Pressure Nitrogen Purge Kit

 

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