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 Ammonium Ion Selective Electrode cartridge develops a millivolt potential proportional to the concentration of ammonium ions in the measured solution. The S80 Ammonium Ion sensors can be used with the Model T80 Transmitter with its dual channel and pH compensation capabilities. The T80 Transmitter will measure ammonium from 0.1 ppm to 14,000 ppm in the optimumpH range of 2-7 pH. Outside this pH range
large errors can occur, in the alkaline pH ranges NH4+ gives up a hydrogen ion to form ammonia, NH3 which is not measured, a small amount of ammonium is measured and a large compensation factor is applied.