Teledyne 6400EH - Sulfur Dioxide Analyzer - Manual (Page 34)

Optional Hardware/Software Model 6400EH
Teledyne Analytical Instruments 22
Table 5-1: Two-Point Span Valve Operating States
MODE VALVE CONDITION
SAMPLE
Sample/Cal Open to SAMPLE inlet
Zero Gas Valve Closed to ZERO AIR inlet
High Span Valve Closed to HIGH SPAN inlet
Low Span Valve Closed to LOW SPAN inlet
ZERO
CAL
Sample/Cal Closed to SAMPLE inlet
Zero Gas Valve Open to ZERO AIR inlet
High Span Valve Closed to HIGH SPAN inlet
Low Span Valve Closed to LOW SPAN inlet
HIGH
SPAN
CAL
Sample/Cal Closed to SAMPLE inlet
Zero Gas Valve Closed to ZERO AIR inlet
High Span Valve Open to HIGH SPAN inlet
Low Span Valve Closed to LOW SPAN inlet
LOW
SPAN
CHECK
Sample/Cal Closed to SAMPLE inlet
Zero Gas Valve Closed to ZERO AIR inlet
High Span Valve Closed to HIGH SPAN inlet
Low Span Valve Open to LOW SPAN inlet
5.4 Hydrocarbon Kicker Option (OPT 65)
This option is specifically designed for those applications where
hydrocarbons are present in the sample gas stream. It includes an
internal, scrubber consisting of a tube of a specialized plastic that
absorbs hydrocarbons very well located within an outer flexible plastic
tube shell.
As gas flows through the inner tube, hydrocarbons are absorbed
into the membrane walls and transported through the membrane wall and
into the hydrocarbon free, purge gas flowing through the outer tube (see
Figure 5-3). This process is driven by the hydrocarbon concentration
gradient between the inner and outer of the tubes.