Fluoride analyzer

Potentiometric-Fluoride Analyzer

Fluoride ions are easily measured by means of potentiometry using Fluoride-selective electrode. The potential between the Fluoride electrode and a suitable reference electrode depends on the concentration of the ion-species to be measured. 

This versatile measuring principle is used in the Fluoride-Analyzer to measure the Fluoride-concentration in waste, cooling, and potable water.

Analytical Methods

Depending on matrix interferences, measuring range, detection limit etc. two different analytical methods can be applied:

Direct Potentiometry

The simplest mode is to measure the difference of the potential between an ion-selective electrode “ISE” and a suitable reference electrode and calculate the concentration based on the Nernst-equation. This method can be applied in samples where interferences from other ions or compounds like complexing agents are absent.

Standard Addition

The method of standard addition is applied in samples where an excess of an interfering compound is present that reacts with the analyte to be measured. Since the interference reacts with the sample in the same manner as on the standard-additions the real concentration is calculated be means of linear regression.



Depending on the users requirements the following options are available:

  • Automatic cell and line cleaning
  • Automatic filtration and  filter cleaning
  • Automatic calibration and/or validation
  • Up to 8-channel multiplexer
  • Filtration systems
  • Cooling systems
  • ATEX-systems



  • Methods: Direct potentiometic, standard-addition
  • Ranges:  Direct potentiometic: 0,02 - 20.000ppm; standard-Addition: 1 -2 decades of standard range.
  • Measuring interval:   direct potentiometric: +/-3 min., standard addition: +/-10 min.
  • Measuring channels: Max. 8
  • Sample: pressure: Max. 4 bars; 0 bar with sample pump.
  • Flow rate: 10 - 120 ml/min.
  • SampleTemperature: >0 - 60 °C
  • Measuring system: Chloride selective electrode
  • Alarms: Threshold (potential free, NC/NO) (optional)
  • Fault:  (potential free, NC/NO)
  • Status: For remote start/stop (potential free)
  • Analog output: Max.8 (0)4 – 20mA, galvanically separeted, max. 500 Ohm
  • Digital inputs : variable Start/Stopp etc.
  • Environmental conditions: In-doors installation
  • Rel. humidity: 5 – 95% (not condensing)
  • Temperature: 10 – 40 °C
  • Housing: wall mounting, upper part: steel powder coated IP55 lower part: fiber reinforced plastic IP20
  • Dimensions: W: ±500 mm x D: ±340mm x H: ±995 mm
  • Weight: ±43 kg
  • Supply: 100 - 240 VAC, 50/60 Hz, 120W
  • Instrument air: dry oil free ISA-S7.0.01-1996 (optional for purging in corrosive atmosphere)
  • Waste: atmospheric, vented,

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