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Optional Equipment
Internal Zero/Span and Sample Valves
Thermo Scientific
42iQD Instruction Manual
9-17
With the zero/span assembly option, a source of span gas is connected to
the
SPAN port and a source of zero air is connected to the
ZERO IN port
as shown in
. Zero in and span gas should be supplied at
atmospheric pressure. It may be necessary to use an atmospheric dump
bypass plumbing arrangement to accomplish this.
For more information, refer to the “
” chapter and the
” chapter.
Figure 9–9.
Flow Diagram, Zero/Span Option
Internal Zero/Span
and Sample Valves
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