A large portable sorption roughing system, mounted on a cart with casters, for use on large, hydrocarbon-free chambers. The pumping system consists of three stages. Consists of a displacement type oil-free mechanical pump. The pump is protected from overload. Includes automatic pressure relief to release trapped gases during bakeout or warm-up.
Screens minimize accidental migration of the sieve material.
Consists of one large sorption pump identical to those in the second stage. Contains 8.5 lbs. of sieve. Cryostat Vacuum insulated stainless steel construction. This allows for sieve bakeout without removal from the cryostat. An insulated lid minimizes boil-off during operation.