Model 4000 DO SENSOR

The Model 4000 DO Sensor is a unique system that combines advanced electronics with solid state, optical sensors.  The system allows for flexible and economical monitor and control of the DO in aeration systems.  The DO sensor is 100% maintenance-free.  It does not required membranes, fill solutions nor routine calibrations.  The operating principle is based on near-infrared technology eliminating inaccuracies caused by changes in the process color.

Based on fluorescence theory, a very specific energy wavelength is transmitted to a ruthenium compound immobilized in a sol-gel matrix.  The ruthenium will absorb this energy, changing the outer electron's energy level.  The electron will then collapse back to it's original energy state, emitting the energy as a photon with a different specific wavelength.  This process is called fluorescing.  If the intensity of the transmitted wavelength is tightly controlled, the amount of fluorescing is both predictable and repeatable.  If oxygen molecules are present, the amount of fluorescing is reduced, referred to as fluorescence quenching.  By measuring the amount of quenching, it is possible to determine the amount of oxygen.

Ambient Conditions


Sensor Check
Distance Between Senor & Analyzer Accuracy
Sensitivity or Resolution
Repeatability
Measuring Range
Temperature Compensation
Calibration Method
Sensor Drift
Wetted Materials
Minimum Flow Rate
Response Time
Sensor Cable
Cleaning System
Maintenance Parts
Warranty Period