ISFET Electrode and The Principle

ISFET (Ion Selective Field Effect Transistor) is a quite unique pH sensor. By applying various kinds of sensing membrane, this product even functions as diverse potentiometric sensors.

Typical Modifications of ISFET Electrode

1. Hydrogen peroxide measurement at high rates

2. Sodium ion measurement
Capable to sense sodium ion by applying Na⁺ - ionophore
to the gate region

3. Bio-sensor
Capable to measure organic acid by fixing the lipoprotein lipase(LPL) with glutaric aldehyde to the gate region.

The Principle of Sensing pH Value

Its ion-selective gate membrane consists of SiO₂ - Si₃N₄, on which interface potentital ("E") generates according to the quantity of hydrogen ion (proton). Thus this product measures pH value.

Related product : 010365 ISFET mV/pH Meter