Teledyne GFC 7001EM operation manual ZERO/SPAN Valve with Internal CO Scrubber Option 50H

Optional Hardware and Software Model GFC7001E Carbon Dioxide Analyzer

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	Sample/Cal	Open to SAMPLE inlet
(Normal
	Zero/Span	Open to ZERO AIR scrubber
State)
ZERO CAL	Sample/Cal	Open to ZERO/SPAN valve
	Zero/Span	Open to ZERO AIR scrubber
SPAN CAL	Sample/Cal	Open to ZERO/SPAN valve
	Zero/Span	Open to PRESSURE SPAN inlet

Teledyne Analytical Instruments 69