D-Opto Dissolved Oxygen Sensor Operation Manual
The D-Opto is designed to measure dissolved oxygen concentrations in liquids; it 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.
Optical Sensor Technology
Unlike conventional dissolved oxygen sensors, the D-Opto sensing element utilises fluorescence to measure dissolved oxygen. The basic principle involves subjecting a fluorescing compound (ruthenium) 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. An extremely stable electronic circuit has been designed to firstly excite the ruthenium, and then measure the intensity of the resulting fluorescence. Therefore using this circuitry, the D-Opto should provide accurate dissolved oxygen measurements over long periods of time (many months) without recalibration.
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 movement. Similarly the D-Opto does not utilise a membrane or any other consumables, thus minimising the servicing requirements.
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