D-Opto SDI-12 Optical DO Sensor

D-Opto SDI-12 optical dissolved oxygen sensor is THE sensor for stream, river and estuary uses.

The D-Opto is an instrument designed for measuring dissolved oxygen concentrations in liquids. The instrument uses field proven solid state optical sensing technology that is highly stable over long periods of time, even in harsh conditions. The D-Opto has extremely low power requirements, and outputs the data in SDI-12 format making it ideal for incorporation into remote environmental monitoring installations. Percent saturation values generated by the D-Opto are the percentage saturation that would occur if the measured liquid were saturated with air under a standard barometric pressure of 1013 mBar at the same temperature.


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Unlike conventional dissolved oxygen instruments, the D-Opto sensing element utilises fluorescence to measure dissolved oxygen. The basic principle involves subjecting a fluorescing compound to a fixed wavelength of light. When the light source is removed, the compound emits a fluorescence, the intensity of which is dependent on the oxygen levels present in the surrounding water. Ruthenium is used as the fluorescing compound in the D-Opto. An extremely stable electronic circuit is used to excite the ruthenium, and then measure the intensity of fluorescence. As a result, the D-Opto should provide accurate dissolved oxygen measurements over long periods of time without the need for re-calibration.

Unlike conventional polarographic dissolved oxygen sensors, the optical method does not consume oxygen. Consequently the measurement of dissolved oxygen by the D-Opto is unaffected by water flow. Similarly the D-Opto does not utilise a membrane or any other consumables, thus minimising the servicing requirements.

D-Opto sensor are the premier SDI-12 optical dissolved oxygen sensor for stream river and estuary uses.

Ordering Information:
D-01 D-Opto sensor (please specify cable length) includes;
Sensor, bio-foul ring, interface board, software, and communications cable.



Weight 3 kg
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