Servomex NanoTrace DF-760E, Instruction Manual

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User Interface DF-760E 103
Figure 110: Isolate Analyzer Warning
7.7.2 Restore Sample Gas Flow
Figure 111: Restore Sample Gas Flow
This command allows the user to return the analyzer gas flow back to normal after
isolation.
CAUTION
Before restoring flow to an isolated moisture cell, be sure the
pressure at the outlet is at or below the cell pressure at the time of
isolation to avoid back diffusion of ambient air from the outlet into
the cell.
7.7.3 GSF Setup
The GSF setup (Gas Scale Factor) is critical for obtaining quantitatively correct results. It
accounts for the fact that moisture and oxygen molecules have different absorption and
diffusion features in different buffer gases.
The GSF should be applied when the user has any knowledge of a change in the buffer gas
or change in the percentages of a mixed background gas. The default setting from the
factory is 100% N
2
, yielding a GSF of 1.00.