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Model 400E Ozone Analyzer
Instruction Manual
Optional Hardware and Software
P/N 04316 Rev: B
51
5.4.
Internal Zero/Span (IZS) (Option 51)
The Model 400E Ozone Analyzer can also be equipped with an internal Zero Air and
Span Gas generator. This option includes an ozone scrubber for producing Zero Air,
a variable ozone generator and a valve for switching between the Sample gas inlet
and the output of the scrubber/generator.
Figure 5-3 shows the internal pneumatic connections for a Model 400E Ozone
analyzer with the IZS Option installed.
Ozone
Scrubber
Optical
Bench
Filter
Pump
Sample
Exhaust
Span Gas
Zero Air
Dry Air
Sample/Cal
Valve
Option 51 (IZS)
Critical Flow
Orifice
Measure/Reference
Valve
Filter &
Charcoal
Scrubber
Ozone
Generator
Figure 5-3: Pneumatic Diagram – IZS Option
Table 5-2 contains the operational state of the major components of the analyzer’s
pneumatic system during various operational modes when the IZS option is
installed.
Table 5-2: Zero/Span Valve Operating States
Option
Mode
Valve
Condition
Sample/Cal Valve Open to SAMPLE inlet
SAMPLE
Ozone Generator OFF
Sample/Cal Valve Open to Ozone Generator
ZERO
CAL
Ozone Generator OFF
Sample/Cal Valve Open to Ozone Generator
50
SPAN
CAL
Ozone Generator ON at intensity level set by user