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Teledyne API – Technical Manual - Model 300E Family CO Analyzers Optional Hardware and Software
69
5.6.4. ZERO/SPAN VALVE WITH INTERNAL CO SCRUBBER (OPTION 50H)
Option 50H is operationally and pneumatically similar to Option 50A above, except that the zero air is generated
by an internal zero air scrubber. This means that the IZS inlet can simply be left open to ambient air.
Internal zero/span and sample/cal valves control the flow of gas through the instrument, but because the
generator and calibrator limit the flow of zero air and span gas no shutoff valves are required.
5.6.4.1. Internal Pneumatics (OPT 50H)
Figure 5-7: Internal Pneumatic Flow OPT 50H – Zero/Span Valves with Internal Zero Air Scrubber
Table 5-3: Zero/Span Valve Operating States for Option 50H
MODE VALVE CONDITION
Sample/Cal Open to SAMPLE inlet
SAMPLE
(Normal
State)
Zero/Span Open to ZERO AIR scrubber
Sample/Cal Open to ZERO/SPAN valve
ZERO CAL
Zero/Span Open to ZERO AIR scrubber
Sample/Cal Open to ZERO/SPAN valve
SPAN CAL
Zero/Span Open to PRESSURE SPAN inlet
04288D DCN5752