When working with liquid Nitrogen one should take the necessary safety precautions such as oxygen detection and protective clothing. Also the cryogenic systems should be engineered is a safe manner so that there are ways of stopping the liquid Nitrogen flow in case of an emergency.
An aspect liquid Nitrogen users often forget is when they use of small open dewars in the laboratory either for transport or storing small quantities of liquid or samples. When transporting samples to other locations it is highly recommended to use dryshippers and as an extra precaution equip them with temperature loggers.
MVE Dry shippers, IATA shipper, CRYOcUBE, Temperature loggers