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Optional Hardware and Software Model 360E Instruction Manual
GFC Wheel
Housing
SAMPLE CHAMBER
GFC Motor
Heat Sync
Purge Gas
Flow Control
External CO2
Scrubber
(Option 51 only)
Figure 5-2: Internal Pneumatic Flow – Zero/Span/Shutoff Valves OPT 50 & 51
5.4.2. Zero/Span/Shutoff with External CO
2
Scrubber
(Option 51)
Option 51 is operationally and pneumatically identical to Option 50 above (See Section5.4.1), except that the
zero air is generated by an externally mounted zero air scrubber filled with indicating soda-lime that changes
color from white to pink as it becomes saturated.
5.4.3. Zero/Span Valve (Option 52)
This valve option is intended for applications where zero air is supplied by a zero air generator like the Teledyne
Instruments Model 701 and span gas are being supplied by Gas Dilution Calibrator like the Teledyne
Instruments Model 700 or 702. Internal zero/span and sample/cal valves control the flow of gas through the
instrument, but because the calibrator limits the flow of span gas no shutoff valve is required.
In order to ensure that span gas does not migrate backwards through the vent line and alter the concentration of
the span gas, a gas line not less than 2 meters in length should be attached to the vent span outlet on the rear
panel of the analyzer. To prevent the buildup of back pressure, this vent line should not be greater than 10
meters in length.
The following table describes the state of each valve during the analyzer’s various operational modes.
42 05232 Rev B3