The OptistatDN-V is very easy to use. A liquid nitrogen reservoir surrounds the upper part of the central sample tube and supplies liquid nitrogen via a capillary tube to a heat-exchanger. During operation, the gravity fed flow of liquid is controlled by a valve in the exhaust line, on the cryostat top plate.
In a vacuum system, the sample space is evacuated and the sample holder located directly on the heat exchanger. Effective sample cooling is achieved due to good thermal contact between the sample holder and the heat exchanger. To change the sample, the cryostat is warmed to room temperature, the vacuum released and the outer case removed.