TA Instruments AR 2000, Operator'S Manual, Page: 19 / 144

AR 2000 Operator's Manual
1 9
Handling Liquid Nitrogen
The ETC uses the cryogenic (low-temperature) agent, liquid nitrogen, for cooling. Because of its low temperature
[-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.
1. 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.
2. 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.
3. The purity of liquid nitrogen decreases as the nitrogen evaporates. If much of the liquid in a container has
evaporated, analyze the remaining liquid before using it for any purpose where high oxygen 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.
If a Person is Burned by Liquid Nitrogen
1. IMMEDIATELY flood the area (skin or eyes) with large quantities
of cool water, then apply cold compresses.
2. If the skin is blistered or if there is a chance of eye infection, take
the person to a doctor IMMEDIATELY.
Chemical Safety
Do not use hydrogen or any other explosive gas with the ETC.
Use of chlorine gas will damage the instrument.
If you are using samples that may emit harmful gases, vent the gases by placing the instrument near an exhaust.