Rosemount 499ADO

The 499ADO Dissolved Oxygen Sensor is a membrane-covered amperometric sensor for the continuous determination of dissolved oxygen between 0 and 20 ppm.

The primary application is wastewater aeration basins.


  • Easily replaceable membrane, no special tools required
  • Automatic air calibration
  • Automatic compensation for changes in membrane permeability
  • Pressure equalization maintains correct membrane tension in pressurized samples
  • Variopol connector option allows the sensor to be replaced without running new cable
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