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2. Information about oxygen probe LDO70
The LDO70 probe uses luminescence optical technology for dissolved oxygen measurements in water.
This type of probe has many advantages compared to classical polarographic type sensor, some of these
are:
Zero polarization time, the instrument is always ready
No shaking of the sample because there is no oxygen consumption
No electrolyte in the membrane
No interference with other gases (ex. CO
Reduced maintenance time
Very fast response time
Accurate even with small sample volumes
Stable and accurate measurements even at low dissolved oxygen readings
O-ring
Membrane on which is
fixed the Luminophore
2.1 Measuring principle
On a membrane permeable to oxygen has been fixed a chemical substance called luminophore. Inside
the sensor a light source pulses a light of blue colour that is reflected from the luminophore on an inner
photocell. When the oxygen permeating through the membrane comes in contact to the luminophore it
modifies the blue light in proportion to the partial pressure of the oxygen. This variation is read by the
photocell which generates a proportional electrical signal.
2.2 Probe Storage
When the probe is not in use, store it in protective cap containing sponge dampened with distilled water.
In this way, the membrane remains protected and moisturized, ready for use.
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LDO70 sensor
OXY 70
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