Thermo Scientific Nicolet Series User Manual page 13

Thermo Scientific
WARNING Avoid freeze burns. Liquid nitrogen is extremely cold and therefore potentially
hazardous.
• When you use liquid nitrogen, always follow standard laboratory safety practices, and
make sure your dewar is made to use with liquid nitrogen. Wear protective clothing
and eye wear, and avoid letting liquid nitrogen come into contact with your skin.
• Make sure you pour the liquid nitrogen slowly when you fill the vacuum bottle or the
detector dewar. Pouring too quickly can cause liquid nitrogen spray out. Wear
protective clothing and eye wear, and follow standard laboratory safety practices to
prevent injury.
1. Open the detector dewar cover and remove the plastic stopper from the dewar.
2. Fill the metal vacuum bottle with liquid nitrogen.
NOTICE Do not spill liquid nitrogen on or near the detector window. If the
window's O-ring seal is cooled very rapidly, the dewar may lose its vacuum and expose
the detector element to damaging atmospheric pressure.
3. Insert the funnel into the detector dewar and pour the liquid nitrogen slowly into the
funnel. (A small amount of liquid nitrogen typically spills out of the funnel. This will not
harm your instrument.)
Operation
Cooling a Detector
Nicolet iS20 User Guide 9