Description of the AF45 sensor
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optek-Manual--1004-2003-02--AF45-US-2011-01-04
www.optek.com
4 Description of the AF45 sensor
This sensor is a high precision UV absorption sensor. It measures attenuation
of light passing through the process medium. The sensor was designed for
direct installation into pipelines.
Fig. 1 AF45
The following are the main sensor components:
Fig. 2 Schematic AF45
1. Sensor body
2. Windows
3. UV-filter
4. Detector
5. Reference detector
6. UV lamp
Its modular construction offers maximum flexibility in adapting to the process,
without affecting the property of measurement. A precisely defined, constant
light beam penetrates the process medium. A hermetically sealed silicon
photodiode measures intensity of incoming and optically filtered light and
supplies the converter with it in form of photocurrent. The UV light source light
intensity is determined by a second hermetically sealed silicon photodiode and
taken into account upon measurement. This way, impairments due to variations
in lamp intensity are ruled out.
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