CS6710C Fluoride Ion Electrode Sensors Rs485 Modbus 4-20ma

Short Description:

The Fluoride Ion-Selective Electrode (ISE) is a highly specialized and reliable electrochemical sensor designed for the direct potentiometric measurement of fluoride ion (F⁻) activity in aqueous solutions. It is renowned for its exceptional selectivity and is a standard tool in analytical chemistry, environmental monitoring, industrial process control, and public health, most notably for optimizing fluoridation in drinking water.
The core of the electrode is a solid-state sensing membrane typically composed of a single crystal of lanthanum fluoride (LaF₃). When in contact with a solution, fluoride ions from the sample interact with the crystal lattice, generating a measurable electrical potential across the membrane. This potential, measured against an internal reference electrode, is logarithmically proportional to the fluoride ion activity according to the Nernst equation. A critical prerequisite for accurate measurement is the addition of a Total Ionic Strength Adjustment Buffer (TISAB). This solution serves three vital functions: it maintains a constant pH (usually around 5-6), fixes the ionic background to prevent matrix effects, and contains complexing agents to liberate fluoride ions bound by interfering cations like aluminum (Al³⁺) or iron (Fe³⁺).