The Model S80 universal sensors provide a stable and economical platform for the in line measurement of pH, ORP, Specific Ion, Dissolved Oxygen, Conductivity or Resistivity. The Model S80 is an insertion or immersion style sensor for use in pipe Tees or on the end of a Stand Pipe for immersion into a tank or pond. The Model S80 is also available as a valve retractable design allowing insertion or removal of the sensor into a pipe without interrupting the process flow. Both sensor designs use easily replaceable electrode cartridges. ECD offers several ion selective electrode cartridges suitable for continuous online measurement.

The Sodium Ion Electrode is a combination electrode with a glass bulb sensing element and a double junction reference electrode. The Sodium Ion Selective Electrode cartridge develops amillivolt potential proportional to the concentration of sodium ions in the measured solution. The typical output is 50mV to 60mV per decade of change in concentration. The Sodium Ion sensors are used with the Model T80 Transmitter with its dual channel mix and match capabilities. These analyzers will measure sodium ions from 200 ppb to 100,000 ppm in the optimum pH range of 6-12 pH. In the acidic solutions the sodium ion electrode, Na+, is interfered by the hydrogen ions, H+, and in alkaline pH solutions, above pH 12, the cations present swamp out all but the highest levels of sodium ions. For measurements below 2 ppm sodium, the pH of the solution should be above pH 10, 20 ppm> 9 pH, 200 ppm > 8 pH....