Product Overview

HI4002 is a solid-state, half-cell ion-selective electrode (ISE) for determining bromide (Br-) in solution. The sensing element uses silver bromide particles that produce a potential change due to the bromide ion exchange between the inorganic particle membrane and the sample, and the internal sensing element is housed in a durable epoxy body. The HI4002 is ideal for a variety of applications in the pharmaceutical industry, laboratories, drinking water and wastewater treatment, food and beverage production and printing processes.

The HI4002 bromide-selective electrode is a potentiometric half-cell sensor mounted in an epoxy body. The internal element is isolated from the sample by a compressed silver bromide sensing membrane. This solid-state sensor requires a separate reference electrode to complete the measurement system.

Key Features

• Solid-state sensor: measurement range of 0.08 to 79910 mg/L Br-.
• Reference half-cell required: This solid-state sensor requires a separate reference half-cell (such as the HI5315) to complete the measurement system.
• Fixed sensing module: solid-state half-cell ISEs are electrodes that detect free ions in solution; the highly insoluble, compressed sensing particles are attached to the HI4002 bromide half-cell through a fixed sensing module for ease of use.
• Durable epoxy body: the probe body of the HI4002 bromide half-cell ISE is made of durable epoxy.
• BNC connection: the HI4002 has a universal BNC connector that easily connects to any benchtop meter with a female BNC probe input.
• Theory of operation: Solid-state sensor electrodes generate a voltage due to the ion exchange that takes place between the solution and the inorganic membrane. Because the solubility of the membrane material in the sample is very limited, an equilibrium is reached; when the ionic strength of the solution is fixed by adding ISA, the voltage is proportional to the concentration of free ions in the solution.

Compatible Meters

Hanna's solid-state half-cell ISEs are designed for use with the HI5315 reference half-cell. The reference half-cell has a cone connection; the cone geometry of the reference forms a liquid junction with the test solution at the tip of the connection cone, producing a highly stable reference potential and a consistent flow of electrolyte into the solution. Simply press gently on the top of the ISE to easily empty the electrolyte filling solution and replace it when necessary.

Usage Notes

For the HI4002 to measure bromide accurately, it is important to adjust the ionic strength of the standards and samples to a high, constant value with a halide ionic strength adjuster (ISA) solution. The halide ISA ensures a constant activity coefficient, so the concentration of free bromide ions can be measured. Measuring all solutions at a constant ionic strength reduces errors between measurements. The HI4002 bromide solid-state ISE has a measurement range of 1 µM (0.08 mg/L) to 1M (79910 mg/L).

Br- conversion table:

Specifications