Serinus 51 User manual 1.0
Introduction
7
1.5.4
Reaction Cell
UV lamp
The UV lamp is a discharge zinc UV lamp which emits UV radiation
over a broad range
UV Bandpass Filter
The bandpass filter only allows UV at 214nm through into the cell.
Photomultiplier tube
The PMT detects the amount of light reaching its sensors. The filtering
of light reaching the PMT allows direct measurement of SO
2
in the
cell.
Optical Bandpass Filter
The optical bandpass filter is a colored glass that only allows light of a
specific wavelength through (310-350nm)
UV Grade Lenses
Two UV grade silica lenses are used in the optical path, the first
(plano-convex) to focus UV radiation inside the measurement cell and
the second (bi-convex) focuses the fluorescent light onto the PMT
cathode from the SO
2
reactions.
UV Reference Detector
The UV reference detector monitors the intensity of UV radiation
entering the measurement cell. This measurement is used to
compensate for variations in UV lamp output.
1.5.5 Main Controller PCB
The Main Controller PCB controls all the processes within the
instrument, it contains a battery backed clock/calendar and an onboard
microprocessor. The Main Controller PCB is located at the top of the
instrument, above the rest of the components when lid is removed. The
PCB is hinged and can be lifted up to stand up vertically allowing easy
access to instrument components underneath.
1.5.6 Reference detector Preamplifier
This circuit board converts current signal from reference detector to a
voltage signal and provide amplification.
1.5.7 PMT High Voltage Supply and Preamplification
This is a single component within the PMT housing. Its function is to
supply high voltage to the PMT and to amplify the photocurrent signal
from the PMT.
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