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VarioxTM Integral variable temperature insert and helium reservoir cryostat, with interchangeable tails and inserts.

Variox cryostat

Variox

The Variox provides a controlled low temperature sample environment, in which the sample is cooled through a static exchange gas. This system offers extremely good temperature control and fast cool down times.

Key features and benefits:

  • Large (50mm diameter) sample access using standard 4He insert
  • Large temperature range from 1.6 to 300K.
  • 3 day hold time
  • Interchangeable inserts available to extend base temperature to 300mK or 30mK
  • Fast cool down times.
  • Interchangeable tails to suit various applications.
  • Automation: LabVIEWTM virtual instruments are available for the ITC503, ILM and IPS120 to allow automation of temperature and field control. These can be integrated into a complete data acquisition system

Applications:

Its base temperature (1.6K) and automated features make the Variox for many applications such as neutron, muon and X-ray scattering, optical and Mossbauer spectroscopy.

Mode of operation

The Variox uses an oil-free pump to draw liquid helium from the storage reservoir to a heat exchanger surrounding the central sample tube. Temperature control is achieved by balancing needle valve control of  helium flow and power dissipated in an electrical heater, both regulated using an ITC503 temperature controller.

The temperature controlled liquid or gas flows up an annular channel surrounding the sample tube. This contains low pressure helium gas to provide thermal exchange with the sample.

Options

  • Each Variox is available with a choice of 5 tail sets for different spectroscopic requirements; Custom tails are available for special requirements. Optical tail sets can be fitted with a wide choice of window materials.
  • A range of sample rods can be supplied with height adjustment, 360° rotation or a goniometer
  • The sample rod may be fitted with its own thermometer for a more accurate determination of the sample temperature
  • Pump options. A simple oil-free vane pump GF4 is supplied for operation to about 3K. Lower temperatures require a single stage rotary pump (EPS40).
  • The base temperature can be extended to 300mK using a HelioxVT insert
  • The base temperature can be extended to 30mK using a KelvinoxVT insert

More information can be found in the product guide in the downloads and links section.

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OI Direct - Cryospares®

Oxford Instruments Direct Cryospares on-line catalogue

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