Oil in Water Analyzer | Operational Theory 1 | |
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The HG (Mercury arc) source and its power supply reside in one enclosure. A quartz lens focuses the energy into a beam for transmission. A collecting lens is also used at the exit of the folded optical train to focus the source energy on to the photodetector.
WARNING: UNDER NO CIRCUMSTANCES SHOULD THE SOURCE MODULE BE OPEN AND THE LAMP AL-
LOWED TO OPERATE UNLESS PERSONNEL IN
THE IMMEDIATE VICINITY ARE WEARING UV FIL- TERING EYE GOGGLES.
1.6.2 Sample Cell
The sample cell rests external to the Control and Analysis electronics placed between the source and detector modules.
1.6.3 Detector Module
The detector module houses the photo detector, chopper assembly, and the signal processing stages of the electronics circuitry. The synchronized chopper motor rotates at 1800 rpm. The detector type found in your ana- lyzer can be identified from the Source module
The filter wheel that carries the optical filters is marked with (M) for measuring and R for reference filter. If you remove the filter wheel, you must align a reference mark on the wheel with a reference mark on the shaft. When the switch activating disc is removed, align with the marks on the switch plate and motor mount when you put it back.
The phototube detector PC board contains the I to E converter stage, second amplifier, logarithmic amplifier, inverter, and first stage of integration. The solid state detector has its I to E converter stage built in on the detector PC board. A system with a solid state detector has a second converter PC board containing the second amplifier, logarithmic amplifier, inverter, and first stage of integration.
The magnetically activated reed switch is mounted on the motor mount. Oscilloscope test points are available and are mounted on a bracket inside the housing for
Teledyne Analytical Instruments | Part II: |
