VPF Series cryostats — sample in vacuum
VPF Series features
- 65 K to 500 K (700 K and 800 K options)
- Uses LN2
- Sample-in-vacuum
The Lake Shore VPF cryostat is an inexpensive liquid nitrogen cryostat offering operating temperatures from 65 K to 800 K. Simple to use and refill, the VPF system uses a refill-style displacer assembly and built-in heater to provide variable temperature capability. Temperatures below 77 K are achieved using an optional pumping manifold. High-temperature capability is provided using special sensors and heaters.
Optional window materials can be installed to span the far/mid- IR, VUV, and x-ray regions for a variety of spectroscopic measurements. The refill assembly permits the refilling of the LN2 reservoir without affecting the controlled temperature.
| VPF part number | Optical | Size | Application-specific | Maximum temperature |
| VPF-100-FTIR | ✔ | FTIR | 700 K | |
| VPF-100 | ✔ | 500 K | ||
| VPF-100S | ✔ | Sub-compact | 500 K | |
| VPF-100ST | Sub-compact | 500 K | ||
| VPF-700S | ✔ | Sub-compact | 700 K | |
| VPF-700ST | Sub-compact | 700 K | ||
| VPF-100H* | ✔ | 800 K |
*Previously VPF-800
| Cooling type | LN2 |
| Minimum temperature | 65 K to 77 K (temperatures below 77 K with optional pumping manifold) |
| Maximum temperature | 800 K |
| Sample environment | Vacuum |
| Cooldown | 15 min (to 77 K) |
| Sample change time | — |
| Typical stability | ±50 mK (measured with temperature controller) |
| LN2 hold time (77 K) | VPF-100: 8 h; VPF-100H: 5 h |
| LN2 hold time (100 K) | 4.5 h |
| LN2 hold time (200 K) | 2.5 h |
| Vacuum level required | 10-4 Torr (vacuum pressure measured at room temperature prior to adding cryogens) |
| Approximate weight | 7 lb (3.3 kg) |