Hanna Instruments (M) Sdn Bhd
11A, Jalan PJS 11/20,
Bandar Sunway,
46150 Petaling Jaya,
Selangor, Malaysia.
+603-5638 9940
+603-5638 9829
Penang Branch Office
Hanna Instruments (M) Sdn Bhd
N0. 303-2-27, Krystal Point,
Jalan Sultan Azlan Shah,
11900 Sungai Nibong,
Penang, Malaysia.
+604-638 4558
+604-645 4558

Sabah Branch Office
Hanna Instruments (M) Sdn Bhd

No. 4-1, 1st Floor,
Plaza Kingfisher,
Jalan Plaza Kingfisher 5,
Inanam, 88450 Kota Kinabalu,
Sabah, East Malaysia.
088-382 941
088-382 942

HI4110 Fluoride Combination Ion Selective Electrode (ISE)

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HI4110 Fluoride Combination Ion Selective Electrode (ISE) ISE Electrodes & Probes HI4110 Fluoride Combination Ion Selective Electrode (ISE) ISE Electrodes & Probes
RM 4,388.00
500 g
In Stock

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hi4110r3.pdf (128.49 KB)
The HI4110 is a solid state, combination ion selective electrode (ISE) for the determination of fluoride (F-) in solution. The lanthanum fluoride crystal membrane produces a potential change due to the fluoride ion exchange between the membrane and the sample. The internal sensing elements are housed within a durable body, composed of a mixture of polyetherimide (PEI) and epoxy.


The HI4110 is ideal for a variety of applications in drinking water treatment, environmental monitoring, and plating baths.

  • Solid state sensor
  • Skirted cone geometry
  • Detection from 0.02 mg/L to saturated F-


The HI4110 fluoride selective electrode is a complete potentiometric cell that contains a silver/silver chloride (Ag/AgCl) reference housed within a PEI/epoxy body with a potassium nitrate/potassium chloride electrolyte. The internal elements are isolated from the sample by a lanthanum fluoride crystal membrane.

Hanna’s solid state combination ISEs are designed with a cone style junction. The skirted cone geometry of the sensor forms the liquid junction with the test solution at the tip of the junction cone, producing a highly stable reference potential and consistent flow rates of electrolyte into the solution. A simple press of the top portion of the ISE makes it easy to empty the electrolyte fill solution and replace when necessary.

For the HI4110 to accurately measure total fluoride concentration, it is important that the pH and ionic strength of the standards and sample be adjusted to a constant value. The total ionic strength adjustment buffer (TISAB) ensures that the solution pH is between pH 5 and 8 and that the activity coefficient is constant. The TISAB solution also preferentially complexes with various metal ions, such as aluminum and iron, which tend to form complexes with fluoride ions. TISAB thus ensures that these metal ions do not interfere, permitting an accurate total fluoride measurement. Measuring all solutions with a constant pH and ionic strength reduces the margin of error between measurements. The HI4110 fluoride solid state ion selective electrodes can measure from 1µM (0.02 mg/L) to saturated F-.


Conversion Table for F-



moles/L (M) to ppm (mg/L)

1.900 x 104

ppm (mg/L) to M (moles/L)

5.263 x 10-5


Features at-a-glance

Replaceable Sensing Modules - Combination solid state ion selective electrodes are electrodes that detect free ions in a solution. The lanthanum fluoride crystal sensing membrane is replaceable and easy to attach to the sensor body.

Durable PEI Body - The probe body is composed of a mixture of polyetherimide (PEI) and epoxy.

BNC Connection - The HI4110 has a universal BNC connector for easy connection to any benchtop meter with a female BNC probe input.

Theory of Operation

A solid state sensor electrode develops a voltage due to the ion exchange that occurs between the solution and the inorganic membrane. An equilibrium occurs due to the highly limited solubility of the membrane material in the sample. When the ionic strength of the solution is fixed by the addition of ionic strength adjuster, the voltage is proportional to the concentration of free ions in solution.


Type combination
Measurement Range Fluoride (F-) saturated to 1•10-6 M, saturated to 0.02 mg/L (ppm)
Optimum pH Range pH 5 to 8
Temperature Range 0 to 80 °C
Approximate Slope -56 mV
Diameter 12 mm
Overall Length 120 mm
Body Material PEI/epoxy
Cable coaxial; 1 m (3.3’)
Connection BNC



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