Continuous flow cryostat transfer lines
These FHT-ST replacement SuperTran or SuperTran-VP cryostat high-efficiency transfer lines include a built-in flow valve and a charcoal cryopump. These transfer lines are optimized for use with continuous flow style cryostats and are not suitable for transferring large volumes of liquid helium.
Looking for transfer lines for transferring large volumes of liquid helium? Please visit the FHT transfer line page.
Download the transfer line datasheet
Three available models
FHT-ST-25-56
Continuous flow flexible liquid helium transfer line for use with ST-500 cryostats and ST-500-based probe stations, including:
- 20 in long, 0.25 in diameter delivery leg
- 56 in long, 0.5 in diameter withdrawal leg
- 72 in flexible section and 0.06 in OD inner helium line
- Vent hole in withdrawal leg 33 in from end to prevent Taconis oscillations
FHT-ST-38-56
Continuous flow flexible liquid helium transfer line for use with all other ST and STVP cryostats (including ST-500-UC), including:
- 20 in long, 0.375 in diameter delivery leg
- 56 in long, 0.5 in diameter withdrawal leg
- 72 in flexible section and 0.06 in OD inner helium line
- Vent hole in withdrawal leg 33 in from end to prevent Taconis oscillations
FHT-ST-CUSTOM
Custom SuperTran line. Vacuum insulated flexible line to transfer liquid from storage Dewar to apparatus.
Specifications for all FHT-ST transfer line models
General
Bend radius of the flexible portion: 305 mm (12 in) minimum radius
Flow control valve included for control of helium flow
Flow rate
All transfer lines tested to a minimum of 700 cc/min gas flow check at 5 psi
Vacuum
NW 25 evacuation port on all transfer line configurations
Recommended maintenance: evacuate the transfer line with a turbopump capable of 10-6 Torr for a minimum of 12 h when performance degradation is noticed
NOTE: The use of liquid nitrogen makes any
vacuum degradation more apparent, requiring more frequent maintenance
Cryostat compatibility
| Cryostat | Transfer line model | Delivery leg OD | Delivery leg length | Helium consumption (mL/h) at 5 K | Base temperature (K) |
| ST-100/ST-100-H | FHT-ST-38-56 | 9.53 mm (0.375 in) | 0.51 m (20 in) | 600 | 2 |
| ST-300/ST-300-C | FHT-ST-38-56 | 9.53 mm (0.375 in) | 0.51 m (20 in) | 600 | 2 |
| ST-400/ST-400-H | FHT-ST-CUSTOM | 9.53 mm (0.375 in) or 12.7 mm (0.5 in) | 127 mm (5 in) to 1.5 m (60 in), increments of 2.5 mm (0.1 in) allowed; default 0.51 m (20 in) | 600 | 2 |
| ST-500 | FHT-ST-25-56 | 6.35 mm (0.25 in) | 0.51 m (20 in) | 1100 | 3.5 |
| ST-500-C | FHT-ST-38-56 | 9.53 mm (0.375 in) | 0.51 m (20 in) | 2500 at 6 K | <6 |
| ST-FTIR | FHT-ST-38-56 | 9.53 mm (0.375 in) | 0.51 m (20 in) | 600 | <2.5 |
| STVP-100/STVP-100-TH | FHT-ST-38-56 | 9.53 mm (0.375 in) | 0.51 m (20 in) | 1300 | <2 |
| STVP-FTIR | FHT-ST-38-56 | 9.53 mm (0.375 in) | 0.51 m (20 in) | 1300 | <2 |
| STVP-NMR | FHT-ST-38-56 | 9.53 mm (0.375 in) | 0.51 m (20 in) | 1400 | <2 |
Dewar compatibility
| Dewar | Transfer line model | Withdrawal leg OD | Withdrawal leg length | Dewar capacity |
| LN-50 | FHT-ST-25-56 | 12.7 mm (0.5 in) | 1.4 m (56 in) | 50 L |
| CF-100 | FHT-ST-25-56 | 12.7 mm (0.5 in) | 1.4 m (56 in) | 100 L |
| LN-50 | FHT-ST-38-56 | 12.7 mm (0.5 in) | 1.4 m (56 in) | 50 L |
| CF-100 | FHT-ST-38-56 | 12.7 mm (0.5 in) | 1.4 m (56 in) | 100 L |
International standards and safety systems
None
Environmental
Ambient temperature: 15 to 35 °C (59 to 95 °F)
Humidity: 55% ±10% (non-condensing)
Included equipment
O-ring compression seal to adapt to standard helium Dewars
Supplemental equipment
Required for operation: vacuum pump, preferably a turbopump capable of reaching 10-6 Torr
Optional: If a turbopump is unavailable, a two-stage rotary pump capable of reaching 10-3 Torr is adequate as long as
the pumping time is long (>1 day)
Shipping weight and size
Shipping weight: 8.6 kg (19 lb)
Shipping crate size: 1.7 m (68 in) × 0.6 m (24 in) × 0.1 m (4 in)