STORAGE DEWAR MOUNT INSERTS


SuperVariTemp Inserts
Variable Temperature Inserts are available for direct mounting to your storage dewar. These sample in vapor Variable Temperature Inserts (VTIs) are economical and easy to use. They fit into standard storage dewars with 2 inch diameter necks and provide variable temperatures from <1.5 to 300K.Storage Dewar Mount Insert Customization is not a problem! The VTI insert length and style of quick connect adapter for storage dewar attachment can be altered to fit your research needs.

Samples are cooled by insertion into flowing helium gas exiting from the vaporizer. The samples are top loading and can be quickly changed while operating.

Liquid helium flows from the reservoir through the adjustable flow valve to the vaporizer located at the bottom of the sample tube. Applying heat vaporizes the liquid and raises the gas temperature. This gas enters the sample zone to cool the sample to your selected temperature.

The temperature of the sample can be varied from typically 1.5K to room temperature. Temperature from 4.2K to room temperature can be set simply by adjusting the electrical current supplied to the heater that is mounted in the vaporizer. Operation can be automated with an electronic temperature controller. Pumping on the sample zone will provide temperatures down to 1.5K.

The system uses enthalpy of the helium vapor which results in very high power handling, fast temperature change, ultra stable temperatures, and ease of use. These super variable temperature inserts are efficient with negligible static liquid helium consumption and a typical operational flow rate of less than 0.125 l/hr.


Universal Storage Dewar Mount Flow Cryostat
Top loading sample in vapor variable temperature cryostat.
Fits standard 1.4 inch neck diameter (1.5" O.D.) storage dewars, 30, 60 or 100 liters.

How do we do it?
a. Universal slide seal adjusts height for proper fit.
b. Electronic flow valve allows fitting into smaller access.
c. Impedance flow line allows pumping the sample zone to <2K.

Typical dimensions:
Sample Tube Diameter = 0.75" O.D. (0.71" I.D. [18mm]).
Maximum O.D. = 1.38".
Operating Range = <2 to 300K.
Insert length = 32" to 40" (adjustable).

bulletAvailable in a more compact version with O.D. of 1.13" and 0.5" O.D. (0.46 I.D.) sample tube.
bulletAvailable with superconducting coil installed.

Exchange Gas Insert
Samples are top loading and cooled by thermal interface to the storage dewar reservoir using static exchange gas. The temperature of the sample can be varied by adjusting the exchange gas pressure and the power dissipated in the sample mount heater. Temperature is <5 to 300K. Available in a single tube (wall) insert or with dual tubes - two wall insert - where cooling and thermal resistance are controlled by dual exchange regions.


Helium 3 Insert
He3 inserts provide operating temperatures from less than 0.3 to 300K. Available with samples in vacuum or top loading. Models with charcoal He3 pumped sealed design or for use with external gas handling systems are available.

The capabilities and benefits of a SuperVeriTemp insert makes it a true 'performance by design' instrument. Call, fax, or E-mail us to find out more about this versatile laboratory tool.