Ideal for demanding dissolved oxygen monitoring in aeration basins, treatment ponds, and process tanks, the HI764833 optical DO probe delivers precise control of oxygen transfer efficiency. Versatile mounting options include direct submersion via ¾" NPT threads or secure in-line installation in a flow cell using the front sensor threads.
Extended reach capability is achieved with optional extension cables, allowing reliable signal transmission over distances up to 50 meters (164 feet) between the probe and connected controller.
Principle of Operation
Advanced fluorescence quenching technology utilizes an immobilized platinum-based luminophore excited by a blue LED, emitting red light that is quenched by dissolved oxygen molecules. In the absence of oxygen, luminescence lifetime is longest; increasing oxygen levels shorten this lifetime proportionally.
Accurate concentration calculation is derived from the inverse relationship between luminescence intensity/lifetime and oxygen presence. A high-sensitivity photodetector measures the luminescence lifetime, enabling the controller to display results as % saturation or mg/L (ppm) dissolved oxygen with exceptional precision.
Long-term stability and minimal drift are maintained through internal reference signal compensation for optical component aging. This innovative design ensures consistently accurate readings over extended periods with significantly reduced calibration frequency compared to traditional polarographic sensors.
-
Pre-calibrated Smart Cap stores factory calibration data for instant plug-and-play accuracy
-
Dual ¾" NPT threads enable flexible submersion or flow-through installation
-
Integrated temperature sensor provides automatic compensation for precise DO measurements
-
Digital intelligence stores probe model, serial number, firmware version, and full calibration history
-
Virtually maintenance-free operation — no electrolyte refills or membrane replacements required
-
Flow-independent performance delivers reliable results even in static or low-flow conditions
-
Rapid response time for real-time process control and optimization
-
Superior low-oxygen stability ensures accurate readings at near-zero concentrations