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 4-20mA 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.
*Also available with SDI-12 output.
d-opto-manual-4-20