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Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J2
4.5 Setting the O
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Generation Mode
There are three modes of feedback operation that can be selected for the ozone generator. The
mode can be changed by pressing SETUP-MISC-O3-GEN-MODE. The three modes are shown
below. Please note that changing to any Mode other than BNCH may affect the concentration
accuracy of the gas being produced.
4.5.1 BNCH Mode
This is the default mode. In Bench Feedback mode the ozone output is actively controlled by
adjusting the UV lamp intensity in the ozone generator. The gas being produced is continuously
sampled by the internal photometer and adjustments are continuously made to maintain the
desired ozone concentration. The Bench Feedback mode produces the most accurate ozone
concentration.
4.5.2 REF Mode
In Reference feedback mode, the ozone generator UV lamp intensity is controlled by using
optical feedback from the reference detector mounted on the ozone generator.
4.5.3 CNST Mode
In Constant mode, no feedback is used to control the UV lamp in the ozone generator. The lamp
is set to an initial drive value from the lamp power supply and is not changed.
4.6 Setting The Time-Of-Day
To set the current time-of-day, which is used for determining when to do an automatic
calibration and for time-stamping the RS-232 reports, press SETUP-MISC-CLK-TIME. The
CPU will display the current time-of-day as four digits in the format "H :M", where "H" is the
hour in 24-hour format (i.e. hours range from 00 to 23) and "M" is the minute (00 - 59). The
operator may change the time-of-day and then press ENTR to accept the new time, or press
EXIT to leave the time unchanged.
4.7 Setting The Date
To set the current date, which is used for time-stamping the RS-232 reports, press SETUP-
MISC-CLK-DATE. The CPU will display the current date as "D MMM Y". For example, April
1, 1990 would be displayed as "0 1 APR 9 0". Change the date by pressing the button under each
field until the desired date is shown. Then press ENTR to accept the new date or press EXIT to
leave the date unchanged.
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