Teledyne GFC-7001E - Trace CO Analyzer - Manual (Page 67)

Optional Hardware and Software Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 67
5.6.3. ZERO/SPAN/SHUTOFF VALVE (OPTION 50B)
This option requires that both zero air and span gas be supplied from external sources.
 Span gas will be supplied from a pressurized bottle of calibrated CO gas.
 A critical flow control orifice, internal to the instrument ensures that the proper flow rate is maintained.
 An internal vent line ensures that the gas pressure of the span gas is reduced to ambient atmospheric
pressure.
 A SHUTOFF valve preserves the span gas source when it is not in use.
 Zero gas is supplied by either an external scrubber or a zero air generator such as the Teledyne’s M701.
5.6.3.1. Internal Pneumatics (OPT 50B)
Figure 5-5: Internal Pneumatic Flow OPT 50B – Zero/Span/Shutoff Valves
Table 5-2: Zero/Span Valve Operating States for Option 50B
MODE VALVE CONDITION
SAMPLE
(Normal
State)
Sample/Cal Open to SAMPLE inlet
Zero/Span Open to IZS inlet
Shutoff Valve Closed
ZERO CAL
Sample/Cal Open to ZERO/SPAN valve
Zero/Span Open to IZS inlet
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