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样品位于静态交换气体中的变温低温恒温器。这些系统提供了极好的温度稳定性，并可根据需求选择与LHe和LN2一起使用。
标准配置
Janis研究变温(VT-200)系统是一种用于Janis CNDT系列杜瓦的气体交换插件。VT-200的工作范围为4.2到77 K（液氦）和77到300 K（液氮）温度稳定性进一步提高，用于光学和非光学系统。
VT-200利用交换气体在样品和液体制冷剂之间形成可调节的热连接。样品架上双线缠绕加热器的输出由自动温度控制器监控，以提供准确的样品温度。样本位于交换气体中。
VT-200包括：
●可拆卸杜瓦瓶
●电气连接口
●交换气体端口
●安全减压阀
●温度传感器
●系统测试
Options & Accessories
Liquid Helium Reservoir Cryostats
SuperVariTemp SVT (sample in flowing vapor) | VariTemp VT (sample in exchange gas) | |
| 1.25 in diameter optical sample holder with retainer | A9-OSH-ST | |
| 1.25 indiameter resistivity sample holder with eight (8) pins | A9-RSH-ST | |
| 1.25 indiameter blank sample holder with four (4) tapped holes | A9-BSH-ST | |
Other size sample holders | Consult Janis | |
| Stainless steel storage Dewar (36 L capacity) | CF-30 | |
| Stainless steel storage Dewar (70 L capacity) | CF-60 | |
Stainless steel storage Dewar (110 L capacity) | CF-100 | |
| Standard 5 ft helium transfer line | A8-FHT | |
| 8-pin electrical feedthrough with mating connector, flange-mounted | A9-8P-ASSY | |
| 10-pin electrical feedthrough with mating connector, flange-mounted | A9-10P-ASSY | |
| 19-pin electrical feedthrough with mating connector, flange-mounted | A9-19P-ASSY | |
| BNC electrical feedthrough (single), flange-mounted | A9-BNC-1 | |
| BNC electrical feedthrough (double), flange-mounted | A9-BNC-2 | |
| Double miniature coaxial feedthrough (SMA), flange-mounted | A9-SMA-2 | |
| Thermocouple feedthrough, flange-mounted | A9-TC-1 | |
| Triax electrical feedthrough, flange-mounted | A9-TRIAX | |
| Window blanks (set of 2) | Consult Janis | |
| Special order optical windows | Consult Janis | |
| Temperature controllers and sensors | Consult Janis | |
| Bottom-looking optical access | Consult Janis | Not Available |
| Indium sealed, strain relief mounted cold windows | Consult Janis | Not Available |
| Cooled radiation shield windows | Consult Janis | Not Available |
| Liquid helium level sensor and display | Consult Janis | Not Available |
| Liquid nitrogen autofill system | Consult Janis | Not Available |
| Spare sample positioner assembly | Consult Janis | Not Available |
| Helium gas collection adaptors | Consult Janis | Not Available |
| Isothermal sample zone | Consult Janis | Not Available |
