Model VNF-100

The Janis VNF-100 cryostat is a liquid nitrogen variable temperature cryostat with the sample located in flowing vapor. Ideal for experiments with samples that are difficult to thermally anchor such as liquid or powder samples, the VNF-100 is a low-cost alternative to the SuperTran-VP or SuperVariTemp dewars when temperatures below 65 K are not required. The VNF-100 features a top-loading sample chamber for rapid sample exchange, and four-way, f = 1.0, optical access to the sample chamber.

Specifications

LN2 capacity (nominal) 1.2 Working time (typical) approximately 6 - 8 hours Initial cooldown time (from room temperature) approximately 30 minutes Sample exchange time (typical) less than 5 minutes Operating temperature range 65 - 325 K (<50 K in N2 “ice”) Temperature stability (with temperature controller) 50 mK or better

Standard Features:

• Quick refill capability with included funnel assembly.
• High quality bellows-sealed evacuation valve and a built-in cryopump for maintaining high vacuum.
• Safety pressure relief valves protecting all independent spaces.
• 1.25" diameter sample tube with customer-specified optical access (standard system offers four quartz window pairs with
  ƒ = 1.0 optical access to the sample space).
• Top loading sample chamber for rapid sample exchange.
• Variable cooling system which places the sample in flowing N₂ vapor (ideal for low thermal conduction samples), providing excellent cooling power and temperature control.
• Light-weight sample positioner/mount assembly, with multi-pin electrical feedthrough access to the window region, offering rotation and translation around the cryostat axis.


• Two silicon diodes installed on the vaporizer (heat exchanger) and sample mount, for controlling and monitoring the system temperature.

Optional Equipment:

• Exhaust flow gauge for more precise control.


• Special window materials and geometries (IR, UV, and x-ray).


• Special sample holders including four-point resistivity measurement and liquid cuvettes.

Please go to the next page to view the Model VNF-100 Mechanical Drawing.

Contact Janis today for details and pricing.

Model VNF-100T	Special 475 K High Temperature Non-optical VNF-100T
	The photo on the left shows a cuvette sample holder for installation on an optical VNF-100.  It is compatible with all 12.5mm wide x 12.5mm deep cuvettes such as the Starna models 1-G-10, 1.7-G-10, 1-SOG-10, 1-Q-10, and 1-I-10.  (Click on the photo for a larger view.)