Teledyne GFC-7001T - Trace CO Analyzer - Manual (Page 68)

Getting StartedTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 68
3.3.2.7. PNEUMATIC LAYOUT FOR ZERO SCRUBBER/PRESSURIZED SPAN
OPTION
Figure 3-25: Internal Pneumatic Flow Zero Scrubber/Pressurized Span Calibration Valves (Opt 50E)
Table 3-10: Zero/Span Valve Operating States for Option 50E
Mode Valve Condition
SAMPLE
(Normal State)
Sample/Cal Open to SAMPLE inlet
Zero/Span Open to internal ZERO AIR
scrubber
Shutoff Valve Closed
ZERO CAL
Sample/Cal Open to zero/span valve
Zero/Span Open to internal ZERO AIR
scrubber
Shutoff Valve Closed
SPAN CAL
Sample/Cal Open to ZERO/SPAN valve
Zero/Span Open to SHUTOFF valve
Shutoff Valve Open to PRESSURE SPAN
inlet
3.3.2.8. PNEUMATIC CONNECTIONS FOR ZERO SCRUBBER/AMBIENT SPAN
OPTION
Option 50H is operationally and pneumatically similar to Option 50A described earlier,
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.
See Figure 3-4 for the location of gas inlets and outlets.