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Helium reliquefier
Helium recovery for a single NMR system, with a much smaller power draw than the earlier single-magnet units.
The HeRL01-RM puts a single NMR magnet on a closed loop: boil-off is liquefied and returned to the bath, so the magnet is not refilled by hand. It uses the same arrangement as the HeRL02-RM, with a compact pulse tube that runs on single-phase mains.
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The unit is sized to one NMR magnet. Boil-off travels the vapor return into the reliquefier, becomes liquid at once, and goes back into the bath. The loop is closed, so the bath is not topped up by transfer. Vibration isolation is arranged so it does not disturb the spectrum. The layout follows the HeRL02-RM and has been run on magnets of different field with the spectra left intact. It suits a small lab with several magnets, or magnets that are not in the same room.
The cold head is a PT404-RM, the 4 K form of the PT205, with a CP103 compressor. That pair runs on single-phase power, so a lab does not need a three-phase supply to keep one magnet’s helium in the bath.
Installation uses the magnet’s existing fill port. Once the loop is closed, refill schedules and helium transfers come off the weekly list.
With no refill stops, the magnet stays available for measurement. A bath that is not allowed to fall also reduces the chance of a quench from a low helium level.
The reliquefier is meant to run all day, on its own. The pulse tube carries a parts warranty of three years or 12,000 hours, whichever comes first.
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| Parameter | Value |
|---|---|
| Cool-down time | Under 4 hours from start-up to liquid helium |
| Cooling water | 1.2 gal/min (4.5 L/min) at 80°F (27°C) |
| Liquefaction rate | At least 0.75 L/day |
| Reliquefaction and recondensing rate | At least 2 L/day |
| Cryocooler | PT404-RM / CP103 |
| Power, water-cooled | 4.2 kW at 60 Hz · 3.4 kW at 50 Hz |
| Power, air-cooled | 4.2 kW at 60 Hz · 3.6 kW at 50 Hz |
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The specification sheet and the system drawing are sent with a sales request. They are not hosted on this page.
Options
Flanges, feedthroughs, and heat exchangers when a standard head does not match the magnet.
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