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The S423/C/OPT probe is used for the optical measure of oxygen in pure
and process waters. The principle of measurement is based on the effect of
dynamic luminescence quenching by molecular oxygen.
Applications
• Measure of oxygen in wastewater
• Measure of oxygen in primary, industrial, recirculating water
Features and benefits
• Reliable concentration measurement
using optical measuring process
• Dynamic luminescence measuring method
• AISI 316 or Black rigid PVC sensor body
• Interchangeable cap for luminophore's replacement
• No mechanically moving parts
• Immediate installation and easy manteinance
• Ability to set salinity and barometric pressure for the compensation of the
oxygen value
Operating principle
The collision between the luminophore in its excited state and the quencher
(oxygen) results in radiationless deactivation and is called collisional or
dynamic quenching. After collision, energy transfer takes place from the
excited indicator molecule to oxygen which consequently is transferred from
its ground state (triplet state) to its excited singlet state. As a result, the
indicator molecule does not emit luminescence and the measurable
luminescence signal decreases.
A relation exists between the oxygen concentration in the sample and the
luminescence intensity as well as the luminescence lifetime which is
described in the Stern-Volmer-equation (1). Here, τ
luminescence decay times in absence and presence of oxygen (I
the respective luminescence intensities), [O
KSV the overall quenching constant.
S423/C/OPT Optical Oxygen Probe – Data Sheet
S
4
2
3
/
C
/
O
P
S
4
2
3
/
C
/
O
P
O
x
y
g
e
n
O
x
y
g
e
n
] the oxygen concentration and
2
T
O
p
t
i
c
a
l
T
O
p
t
i
c
a
l
P
r
o
b
e
P
r
o
b
e
D
a
t
a
S
h
e
D
a
t
a
S
h
e
and τ are the
0
and I are
0
e
t
e
t
9
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