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MEASURING PRINCIPLE
2 - 6
ETC00303(1) BINOS E e (2.0) 11/00
Rosemount Analytical
2.2 UV Measurement
The absorption measurement in the UV spectral range is based on the same principle as the
IR measurement (Fig. 2-1).
A glow-discharge lamp [2] is used as radiation source.
The UV radiation passes through the chopper [3] and a filter cell [6] into the dual-section
analysis cell [7].
A second filter cell [6] is installed after the analysis cell. The photodetector [13], which follows,
converts the pulsating radiation intensities from measuring [8] and reference side [9] of the
analysis cell into electrical voltages.
As the glow-discharge lamp needs a specific and as constant as possible temperature, the UV
lamp is thermostat controlled to about 55 °C for BINOS E.
UV MEASUREMENT