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Teledyne API - T100 UV Fluorescence SO2 Analyzer Principles of Operation
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Figure 13-2: UV Light Path
13.1.3. UV SOURCE LAMP
The source of excitation UV light for the T100 is a low pressure zinc-vapor lamp. An
AC voltage heats up and vaporizes zinc contained in the lamp element creating a light-
producing plasma arc. Zinc-vapor lamps are preferred over the more common mercury-
vapor lamps for this application because they produce very strong emission levels at the
wavelength required to convert SO
2
to SO
2
*, 213.9 nm (refer to Figure 13-4).
The lamp used in the T100 is constructed with a vacuum jacket surrounding a double-
bore lamp element (refer to Figure 13-3). The vacuum jacket isolates the plasma arc
from
most external temperature fluctuations. The jacket also contains thermal energy
created by the lamp’s operation therefore helping the lamp to heat up and maintain
proper vaporization temperature. Light is emitted through a 20 mm x 5 mm portal.
06807C DCN6650