Specifications

CDEM Handling and Care 8-15
SRS Residual Gas Analyzer
multiplier and lead to slow performance degradation (due to reduced secondary emission
efficiency).
Oil contamination is a serious problem, and can result in catastrophic destruction of the
multiplier: use liquid nitrogen traps with diffusion pumps (particularly for slicone oil
based pumps) , and molecular sieves traps with mechanical roughing pumps whenever
possible.
If the multiplier becomes contaminated it must be cleaned immediately! (See CDEM
Refreshment procedure in this chapter)
Storage
CDEM’s can be stored indefinitely in a clean dry container such as an air or dry nitrogen-
filled “dry box”. Double bagging with clean, dust-free zip locked bags also works well as
a temporary alternative