KLU-206A Fluoride Ion Selective Electrode

The title and specification table identify this fluoride electrode as KLU-206A. Match that model to the supplied nameplate and documentation when ordering or replacing a probe.

A fluoride ISE responds to free fluoride-ion activity. Within its valid response range, the potential varies approximately with the logarithm of activity, rather than linearly with concentration. Calibration under controlled conditions relates the potential to the required concentration scale.

Define the analytical method

• Specify whether the task requires free fluoride or a method-defined dissolved/total fluoride result. Complexed fluoride is not automatically measured as free fluoride without suitable preparation.
• For laboratory reference measurements, follow the chosen method for standards, pH, ionic-strength adjustment and complexing agents, including TISAB where required. A laboratory buffer procedure does not establish that the online installation automatically adds buffer.
• Assess pH, ionic strength, metal complexes, deposits and matrix compatibility. An ISE is not based on optical colour measurement, but this does not make it immune to contamination or all effects associated with turbid samples.
• The listed reference arrangement cites 100 KPa (1 Bar). Confirm its meaning and the actual process-pressure rating; do not use a reference-system statement as the assembly pressure limit.

Select and maintain the installation

• Confirm the listed 3/4 NPT mounting, supplied cable, wetted materials and temperature conditions. Food, beverage or household-product analysis requires the appropriate preparation and materials assessment rather than direct use in every product.
• Use the specified conditioning, calibration and cleaning procedure, then verify with an independent sample. Inspect the membrane and reference system during service.
• RS485 Modbus RTU requires compatible power, wiring, serial settings and register interpretation. Confirm fluoride units and reporting basis in the receiving system.