Automatic Dewar Filling Station

The AFS-01 is an automatic shut off liquid nitrogen dewar filling station for standard liquid cylinders.

The AFS-01 is designed to fill portable low pressure liquid nitrogen dewars from a pipe system or bulk tank. The AFS-01 uses a cryogenic sensor to detect a “full” condition. Once full, cryogenic valves shut off the fill cycle maintaining the fill pressure of the liquid cylinder. The liquid cylinder is ready for immediate use.


  • Eliminate overfilling and loss of LN2.

  • Create a safer work environment with fill shut off timer, vent safety interlock, and emergency stop.

  • Eliminate wasted labor and downtime.

  • Save money by eliminating the need for dewar deliveries.

  • Control the maximum amount of time the inlet valve will stay open.

EnclosureStainless Steel NEMA 4X, IP66
Power Input110VAC or 240VAC, 60Hz
Power Usage194W Nom
SpecificationsAllen-Bradley Micrologix 1100
Allen-Bradley PanelView800
External Temp Rating: 32-122F
20-175 psi Pressure Rating
Additional ComponentsVJ or Non-VJ Hoses
Dimensions16" W x 20" L x 6" D
41cm x 51cm x 15cm


  • Allen Bradley PLC controls. Start the process and it will run itself.

  • Adjustable timeout timer and cryogenic sensor threshold.

  • Status indicator light and audible alarm contact.

  • Vent interlock, max fill timer, EMO switch, and fail close valves.

  • Fill liquid cylinders where it is most convenient.