The ECD Fluoride analyzer utilizes a Fluoride ion selective sensor that converts the analog signals from the electrode cartridge into a digital protocol that allows two way communications with the transmitter. The identity of sensor, measurement type and serial number, are stored in the sensor’s memory along with three calibration registers. When connected to an ECD digital analyzer the sensor’s information is uploaded to the analyzer. This configures the display and outputs of the transmitter to the values appropriate to the sensor’s measured parameter.
Model: ETX + S80
(Fluoride Ion Selective Electrode)
The Model ETX Universal Transmitter is used in combination with the S80 Fluoride Ion Selective Electrode to achieve a cost effective Fluoride Analyzer.
The Fluoride Ion Selective Electrode cartridge develops a millivolt potential proportional to the concentration of free Fluoride ions in the measured solution. The model S80 Fluoride Ion sensors are used with the Model ETX Transmitter with its dual channel and pH compensation capabilities. These analyzers will measure free fluoride ions from 0.02 ppm to 2,000 ppm in the optimum pH range of 5-8 pH. Outside this pH range, large errors will occur in the acid range and small errors will occur in the alkaline pH ranges. In acidic solutions fluoride ions react to form hydrofluoric acid, HF, pKa = 3.2, at 3.2 pH half of the available fluoride ions are HF and half are the measurable F–. This characteristic can easily be compensated for by adding a pH sensor into the measurement contoller.