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The Triton DO8 optical dissolved oxygen sensor uses a fluorescence quenching method to determine the oxygen concentration in water. The use of this Optical Dissolved Oxygen method by the Triton DO8 minimizes maintenance, increases reliability and improves the long term accuracy of the measurement. Combine this improved measurement technology with the rugged, easy to install design and the DO8 provides the best solution for long term measurements in aeration basins, aquaculture and all types of environmental water.

A circular layer of optically active, oxygen sensitive molecules is integrated into an easily replaceable cap. This durable layer is highly permeable to oxygen and rapidly equilibrates to its surroundings. The cap aligns the optically active fluorescence layer above two optical components inside the sensor, an emitter and a detector. The emitter flashes a green light at the layer and the layer fluoresces back a red light, the duration and intensity of the fluorescence are directly dependent on the amount of oxygen in the layer. With little to no oxygen in the layer the response is long and intense. Oxygen, however, quenches the fluorescence response so the response decreases to shorter times and lower intensities as the oxygen level increases. Both the time and intensity values are used to calculate the oxygen level and various diagnostics functions associated with the measurement.

The optical signals are continuously monitored and analyzed for reliability inside the sensor. The oxygen level, water temperature and air pressure are included in the various calculations. The aging of the sensor cap is monitored and reported to the C-22 controller as are any implausibly high or low oxygen values detected by the sensor. The digital communication provides a trouble free connection between the Triton DO8 sensor and the C-22 controller that is unaffected by the EMI noise so common at waste water treatment plants.

The Triton DO8 is unaffected changes in the flow, the pH or the conductivity of the sample. Higher flow rates do minimized the growth of biofilms on the sensor and are therefore advantageous. Simply wiping the sensor with a wet rag is all the maintenance that is required. Unlike all amperometric dissolved oxygen sensors, there are no membranes to replace, electrolytes to refill or anode/cathode assemblies to service or replace. The easily replaceable sensor cap is the only serviceable part of the Triton DO8 sensor and it should last greater than 2 years in an aeration basin.

Installation can be either immersion style with a PVC pipe assembly and mounting clamp or a PVC flow through holder.