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Optional Equipment
Internal Zero/Span and Sample Valves
Thermo Scientific
43iQHL 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.
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.
The optional heated hydrocarbon kicker removes hydrocarbons from the
gas stream while leaving the SO
2
concentration unaffected. It operates on a
selective permeation principle using differential pressure to force
hydrocarbon molecules to pass through the tube wall. The differential
pressure is created across the tube wall as sample gas passes through a
capillary tube which reduces its pressure. The sample gas is then fed to the
shell side of the hydrocarbon kicker. The heated kicker operates at the same
temperature as the optical bench and requires no additional power.
A 5-10 micron pore size, two-inch diameter PTFE element is available for
the 43iQHL. This filter should be installed just prior to the
SAMPLE
bulkhead. When using a filter, all calibrations and span checks must be
performed through the filter.
Internal Zero/Span
and Sample Valves
Heated Hydrocarbon
Kicker
PTFE Particulate
Filter
Summary of Contents for 43iQHL
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