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Teledyne API – Technical Manual - Model 300E Family CO Analyzers Optional Hardware and Software
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 API’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/Cal Open to SAMPLE inlet
Zero/Span Open to IZS inlet
SAMPLE
(Normal
State)
Shutoff Valve Closed
Sample/Cal Open to ZERO/SPAN valve
Zero/Span Open to IZS inlet
ZERO CAL
Shutoff Valve Closed
Sample/Cal Open to ZERO/SPAN valve
Zero/Span Open to SHUTOFF valve
SPAN CAL
Shutoff Valve Open to PRESSURE SPAN Inlet
04288D DCN5752