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Optional Hardware and Software M400E Ozone Analyzer Operator’s Manual
5.6.2. INTERNAL ZERO SPAN (IZS) OPTION (OPT 51A)
The Model 400E photometric 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 for
producing calibration span gas and a valve for switching between the sample gas inlet and the output of the
scrubber/generator.
A reference detector monitors the operating level of the IZS’ ozone generator. The detector senses the intensity
of the UV lamp internal to the IZS generator and coverts this into a DC voltage. This voltage is used by the CPU
as part of a feedback loop to directly adjust the brightness of the lamp producing a more accurate and stable
ozone concentration.
The ozone output level of the generator is directly controllable by the user via the front panel of the instrument or
remotely via the analyzer’s RS-232 Serial I/O ports.
See Section 9.3 for instructions on setting the span gas level of the ozone generator.
See
Section 8.1 for information on configuring this option and using the Serial I/O ports.
See Appendix A.2 for a list of variables used to control this parameter.
See Section 9.6 for information on calibrating the output of the O
3
Generator
Figure 5-6: M400E Pneumatic Diagram with Internal Zero/Span (IZS) Option (OPT-51A)
For instructions on setting up a M400E analyzer equipped with the IZS option see Section 3.4.3 and Section
3.4.4
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