Variable Temperature Insert

Cryogenic offers a wide range of variable temperature inserts (VTI's) with the availability of 3 different temperature ranges; 1.6K - 100K, 1.6K - 300K and 1.6K - 400K the available standard units have sample spaces from 18mm to 48mm.

to do:table.standard size VTI

A typical VTI is inserted to a cryostat containing a pool of liquid helium to cool the superconducting magnet and  controls the temperature of the sample.  However, it is integrated to the system for the CF cryostats.

The VTI operates by drawing liquid helium through a  needle valve. The liquid He-4 passes through a heat exchanger into the sample space and is then pumped away by a room temperature vacuum pump. An integral heater and sensor on the heat exchanger allows the temperature to be set to any value from 1.6 to 320K.

As an option Cryogenic supplies motor driven needle valves so that the helium flow rate can also be controlled from the computer.