ISE Fluoride Measurement with TISAB and SKA Method

INSTRAN Fluoride Analyzer from Spain is designed to handle all kind of samples ranging from drinking water to waste water and even for sea water application. It incorporates laboratory measuring technique into online analyzer with self-calibration and self-cleaning in each analysis to ensure the measurement is in high precision.

The unique design of INSTRAN Fluoride analyzer with syringe volume-controlled method ensures syringe will never contact with samples or reagents and thus prolong the shelf life of the syringe. The analyzer requires very little maintenance and low reagents consumption but yet powerful and high in accuracy.

INSTRAN Fluoride Analyser

Measuring Principle: Selective Electrode – ASTMD1246 – EPA 60 FR:

  • Sample condition with F- TISAB III reagent to pH < 5.5
  • Reading of the generated electrode potential
  • Addition of known volume of standard
  • Measure by Double Known Addition (DKA) method
  • Precise volume controlled of sample and reagents by syringe dispensing system ensure excellent accuracy and repeatability


  • Self-Cleaning after each Measurement
  • Self-correction/calibration in each Measurement, correcting any drift of the sensor
  • Calibration Interval Every 2 Months (Application Dependent)
  • Very low maintenance & operating cost
  • Low reagent consumption


  • Drinking Water
  • Process Water
  • Water Treatment Plant
  • Raw water
  • Desalination
  • Sea Water
  • Semi Conductor WWTP
Technical Specification
Sensor TypeIon Selective Electrode (ISE) – Fluoride (F-)
Measuring Range0 ~ 5, 0 ~ 10, 0 ~ 100 mg/L (ppm) [Configurable to Higher Range]
Accuracy2% FS + 0.02 mg/L (ppm)
Resolution0.001 mg/L (ppm) for Range < 10 mg/L (ppm)
0.01 mg/L (ppm) for Range < 100 mg/L (ppm)
Power100 ~ 240 VAC, 50/60Hz, 200 Watts Max
[Fuse Protection: 250V, 5A]
Dimension500 x 150 x 600 mm (L x W x H)
User InterfaceKeypads with 4 Keys and 4 Indication LED
DisplayBacklit, Graphic and Wide Screen Color
Output2 x Analogue Output 4 – 20mA, Max Load: 700 Ohms
2 x Digital Outputs
Input2 x Digital Inputs [Assigned to detect of lack of Sample or Reagents]
5 x Assignable Digital Inputs
Communication Modbus RS485 (RTU / ASCII)
Relays4 x Assignable (Free Voltage) Relays with 3 Contacts (C, NO and NC)
CalibrationAutomatic with Schedule
Manual – Automatic On Demand
Sample Flow100 ml/min [Minimum]
WashingAutomatic after Each Measurement
[Programmable with Sample, DI Water or Washing Solution (Hard Cleaning]
Dispensing System Syringe Dispensing System with Fast Loop Sampling System [Prevent Syringe in contact with Sample or Reagents] made of Teflon
High reliability Solenoid Valve which can handle particles of dimension up to 1.5mm diameter
ReactorSmall Volume Reaction Cuvette [12ml to 17 ml] with Drain Solenoid Valve able
to handle particles, size up to 3mm diameter
Fluid SystemChemical Resistance Tubing made of Inert Material with direct connection
without coupling
Operating Temp-20 deg C ~ +65 deg C with Maximum RH at 95% Non-Condensing
Sample Temp+ 10 ~ 45 deg C
A I ANALYTICAL PTE LTD | Address 30, Kallang Place, #06-01, Singapore 339159 | Tel: +65 6459 0785 | Email: