DMX-19 Exchange Gas Cryostat

DMX-19 Exchange Gas Cryostat

The DMX-19 is a unique gas exchange cryostat which combines cryogen-free operation with proven Displex closed cycle refrigeration for ease of sample change and fast sample cool down. Some common uses include resistivity, critical current, hall effect, and vibrating sample magnetometry.
Samples can be quickly loaded into the pre-cooled sample well for rapid and uniform cooling.
The DMX-19 is cooled by the DE-202 laboratory expander, which can be used with a broad range of other vacuum shrouds and radiation shields.

Features

Temperature variable from 12-13K to 350K
Typical sample cooldown from room temperature to 93K in 8 minutes
Simple airlock mechanism allows quick changing of samples
Non-magnetic tail-pieces: OFHC Copper Vacuum Shroud and Sample Well
Accommodates samples up to 0.5 inch (12.7 mm) diameter by 6 inch (152 mm) long
Interchangeable upper sample wells for different applications
Rapid and uniform sample cooling
No liquid cryogens required

dmx-19

side view

Side View

top view

Top View

dmx19_vsm.jpg (17940 bytes)

Upper Sample Well for VSM

PRINCIPLES OF OPERATION

Refrigeration for the DMX-19 is provided by a closed cycle Displex^® DE-202 expander which is thermally connected to the sample well. Helium gas is fed into the sample well and stratifies with the coldest gas in the sample area. This gas provides the necessary environment for characterization of materials from 13 K to 350 K. Samples up to 1/2 inch (12.7 mm) diameter by 6 inch (152 mm) long are mounted on a non-magnetic sample holder and inserted into the cold sample well through an air lock valve. Samples can be changed easily and cooled quickly because the insulation vacuum inside the vacuum shroud is not disturbed. Sample well temperature is controlled by a temperature sensor and resistance heater on the expander cold tip. Another sensor may be mounted in the sample area.

SPECIFICATIONS DMX-19

Temperature:	Range 12 to 350 Kelvin
Sample Size:	0.5 inch (12.7 mm) x 6 inch (152 mm) long max
Sample Cooldown Time:	8 minutes to 93K