Chapter 1 – Safety
Page 1-2
TestEquity 3007C Temperature Chamber
!
WARNING:
Liquid nitr
ogen is extremely cold (−190°C or −320°
F). It can cause severe
burns, frostbite, or eye damage. When handling liquid nitrogen containers or
piping; wear goggles for eye protection, protective clothing, and thick
impervious gloves (such as welder’s leather).
!
WARNING:
The connecting tube must include a relief valve designed for use with liquid
nitrogen if a manual or automatic isolation valve is present at your source of
supply or at any point between the source and the connection point on the
back of the 3007C Chamber. This relief valve must be rated for at least 35
psig and less than 100 psig. It is needed to prevent excessive pressure from
developing when the nitrogen in the connecting line evaporates during off
cycles. Care should be exercised in sighting the relief valve to assure that
should it relieve, the effluent will not discharge towards operating personnel.
!
WARNING:
All liquid nitrogen connecting piping or tubing must be well insulated with
appropriate vapor sealed or vacuum jacketed materials. Un-insulated nitrogen
connecting lines can condense pure oxygen on their surface since liquid
nitrogen is colder than liquid oxygen. Liquid oxygen can present a
spontaneous fire hazard when spilled onto organic materials.
!
WARNING:
Nitrogen gas is heavier than air. It makes up about 78% of the Earth’s
standard atmosphere, is non-toxic, colorless, odorless, and tasteless. Pure
nitrogen gas in a closed area can present an asphyxiation hazard (suffocation)
without warning.
