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General information

  • Wear clothing that covers arms and legs completely; wear closed shoes.
  • While filling or transferring liquid gas, wear insulating gloves and safety goggles.
  • Always leave a small amount of liquid gas in recipient larger than 40 litres to avoid excessive evaporation. This also prevents the formation of ice in the cryo-containers.
  • The evaporation of 1 litre of liquid nitrogen produces about 700 litres of nitrogen gas. Cold, gaseous nitrogen is denser than air and displaces oxygen (risk of asphyxiation).


  • In cargo lifts or stairs. Never in lifts with people.
  • After the transport, helium dewars should be connected immediately to the helium recovery conduit.
  • Liquid gases should not be transported with private vehicles.

Warning signs

Extreme cold

Extreme cold

Frostbite: to be treated like a burn

Danger of asphyxiation

Danger of asphyxiation

Leave danger area and alert Tel. 888.


Wear safety goggles

Wear safety goggles

(Order here)

Wear hearing protection

Wear hearing protection

(Order here)

Wear gloves

(Order here)


René Keller

René Keller

ETH Zurich


René Johann Keller

HEZ E 17.5

Schafmattstrasse 23

8093 Zürich


  • phone +41 44 633 22 24 
  • vcard V-Card (vcf, 1kb)
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Sat Jun 24 02:56:07 CEST 2017
© 2017 Eidgenössische Technische Hochschule Zürich