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Getting Started Teledyne API – Model T400 Photometric Ozone Analyzer
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3.6.2. INTERNAL ZERO SPAN (IZS) OPTION (OPT 50G)
The Model T400 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 converts
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 Sections 3.3.2.3 and 3.5 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 3-24: T400 Pneumatic Diagram with Internal Zero/Span (IZS) Option (OPT-50G)
For instructions on setting up a T400 analyzer equipped with the IZS option see Sections
3.3.2.3 and 3.3.3
06870C DCN6332