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Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J2
The warranties set forth in this section shall be of no force or effect with respect to any Product:
(i) that has been altered or subjected to misuse, negligence or accident, or (ii) that has been used
in any manner other than in accordance with the instruction provided by Teledyne API or (iii)
not properly maintained.
THE WARRANTIES SET FORTH IN THIS SECTION AND THE REMEDIES
THEREFORE ARE EXCLUSIVE AND IN LIEU OF ANY IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE OR OTHER
WARRANTY OF QUALITY, WHETHER EXPRESSED OR IMPLIED. THE
REMEDIES SET FORTH IN THIS SECTION ARE THE EXCLUSIVE REMEDIES FOR
BREACH OF ANY WARRANTY CONTAINED HEREIN. TELEDYNE API SHALL
NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES
ARISING OUT OF OR RELATED TO THIS AGREEMENT OF TELEDYNE API'S
PERFORMANCE HEREUNDER, WHETHER FOR BREACH OF WARRANTY OR
OTHERWISE.
TERMS AND CONDITIONS
All units or components returned to Teledyne API should be properly packed for handling and
returned freight prepaid to the nearest designated Service Center. After the repair, the equipment
will be returned, freight prepaid.
1.3 Principle Of Operation
M401 Ozone calibrator consist of two major parts; the ozone generating device and the
photometer. Ozone generating device itself also consist of a pump, an air scrubber to self-
generate zero air, a pressure regulator to control flow rate, an ozone generator using UV lamp,
and a manifold. The pressure regulator provides very stable flow of zero air through the O
3
generator, while the light intensity of the UV lamp is controlled to generate accurate and stable
ozone output.
The photometer is used as part of a feedback lamp control to assure stable O
3
output even during
changing conditions. The photometer is compensated for both pressure and temperature
variations. This true photometer operation along with self-generated zero air results in a
completely self-contained O
3
generating system.
The detection of ozone molecules of the photometer is based on absorption of 254 nm UV light
due to an internal electronic resonance of the O
3
molecule. The Model 401 Photometer uses a
mercury lamp constructed so that a large majority of the light emitted is at the 254nm
wavelength. Light from the lamp shines down a hollow glass tube that is alternately filled with
sample gas, then filled with zero air. The ratio of the intensity of light passing through the zero
air to that of the sample forms a ratio I/I
o
. This ratio forms the basis for the calculation of the
ozone concentration.
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