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A.2 UV optical unit
The UV optical unit houses the lamp (Zn or Hg), the wavelength
filter and the UV flow cell. The light beam is directed through a
double conical or straight flow-through cuvette (6 ml or 2 ml
illuminated volume) to a photodetector. The photodetector current is
fed to the signal processing circuitry in the module.
The reference signal comes from the same point in the lamp as the
signal measuring the sample, thus assuring a stable baseline by
eliminating the effects of variations in lamp intensity.
The Hg lamp emits light only at certain wavelengths. It does not
emit light at 280 nm, so for this wavelength, the light is converted at
a fluorescent surface before it passes the filter. On the lamp housing,
there is a special exit for 280 nm light, which means that the lamp
position needs to be changed when working with this wavelength.
For 214 nm wavelength, a Zn lamp is used. This lamp is larger than
the Hg lamp and is therefore mounted in a larger lamp housing.
The lamp connectors are keyed to inform the monitor software of
which lamp type is connected.
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Monitor UPC-900
User Manual 18-1125-55 Edition AE
Reference information A