Teledyne GFC 7001EM ZERO/SPAN/SHUTOFF Valve Option 50B, Internal Pneumatics OPT 50B

Optional Hardware and Software Model GFC7001E Carbon Dioxide Analyzer

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		Sample/Cal	Open to SAMPLE inlet
	(Normal		Zero/Span	Open to IZS inlet
	State)
			Shutoff Valve	Closed
			Sample/Cal	Open to ZERO/SPAN valve
	ZERO CAL		Zero/Span	Open to IZS inlet
			Shutoff Valve	Closed
			Sample/Cal	Open to ZERO/SPAN valve
	SPAN CAL
			Zero/Span	Open to SHUTOFF valve
			Shutoff Valve	Open to PRESSURE SPAN Inlet

Teledyne Analytical Instruments 67