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Cryogenic Handling
liquid Nitrogen
Most of our cryostats and cryo-magnets have an outer liquid nitrogen jacket to reduce the heat load on the helium bath.
The storage dewars are prepared by the sample environment staff and can be picked up at the preparation area (between FOCUS and MARS).
The dewars provided are self pressurizing systems with a mechanical level indicator at the top as shown below.
The dewars are always pressurized.
- Ensure that the hose is firmly connected to the vessel and the nozzle is not pointing towards a person before opening the valve.
The filling hoses have a metallic protection sleeve. The valves and the hose get very cold during a nitrogen transfer.
- Make sure that you wear protective leather gloves when handling cold parts.
When using the automatic nitrogen refill
- test the automatic to assure that the filling hose remains in the cryostat filling port and that the system switches off correctly
liquid Helium
Liquid Helium dewars are provided by the sample environment staff at the sample preparation area.
At PSI we run a Helium recovery system.
- Please make sure that the dewars are always connected to the recovery line
- Remember to close the valve on the recovery line when taking a dewar away and to open it after return
Attachments:
HeDewar.png
gasline.png
CCU.png
transportstraps.png
afterfill.png
cl_clpb.gif
LN2.png
HeDewartransport.png
This particular version was published on 07-May-2012 12:46:20 UTC by Bartkowiak.
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