DHR Series Getting Started Guide Page 10
Liquid Nitrogen Safety
Handling Liquid Nitrogen
The ETC uses the cryogenic (low-temperature) agent, liquid nitrogen, for cooling. Because of its low tem-
perature [–195°C (–319°F)], liquid nitrogen will burn the skin. When you work with liquid nitrogen, use
the following precautions:
• Liquid nitrogen evaporates rapidly at room temperature. Be certain that areas where liquid nitrogen is
used are well ventilated to prevent displacement of oxygen in the air.
• Wear goggles or a face shield, gloves large enough to be removed easily, and a rubber apron. For extra
protection, wear high-topped, sturdy shoes, and leave your trouser legs outside the tops.
• Transfer the liquid slowly to prevent thermal shock to the equipment. Use containers that have
satisfactory low-temperature properties. Ensure that closed containers have vents to relieve pressure.
• The purity of liquid nitrogen decreases as the nitrogen evaporates. If much of the liquid in a container
has evaporated, analyze the remaining liquid and gas before using it for any purpose where high oxy-
gen content could be dangerous.
• The oven inner doors have a trough around the bottom of the element assembly for collection of excess
liquid nitrogen. Any excess fluid collected will drain out from the oven at the lower outer edge.
Potential Asphyxiant
WARNING: Liquid nitrogen can cause rapid suffocation without warning.
Store and use in an area with adequate ventilation. Do not vent liquid nitrogen
in confined spaces. Do not enter confined spaces where high concentrations
of nitrogen gas may be present unless the area is well ventilated. The warning
above applies to the use of liquid nitrogen. Oxygen depletion sensors are
sometimes utilized where liquid nitrogen is in use.
Asphyxiant potentiel
AVERTISSEMENT: L'azote liquide peut provoquer un étouffement rapide sans
prévenir. Entreposez-le et utilisez-le dans une zone bien aérée. N'évacuez pas
de l'azote liquide dans des espaces confinés. N'entrez pas dans des espaces
confinés où des concentrations élevées d'azote gazeux peuvent être présen-
tes à moins que la zone soit bien aérée. L'avertissement ci-dessus s'applique
à l'utilisation de l'azote liquide. Des niveaumètres d'oxygène sont parfois utili-
sés dans les espaces où l'azote liquide est utilisé.
Extremes of temperature
During operation, extreme hot or cold surfaces may be exposed. Take
adequate precautions.
Wear safety gloves before removing hot or cold geometries.
Températures extrêmes
Pendant l'utilisation de l'instrument, des surfaces extrêmement chaudes ou
froides peuvent être exposées. Prenez les mesures de précaution adéquates.
Portez des gants de sécurité avant de retirer des géométries chaudes ou froi-
des.
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