This sensor can be used to measure ammonia (NH3) in aqueous solutions. The ammonia sensor consists of a pH glass electrode and a reference electrode. Both electrodes are in an
electrolyte.
The electrolyte is separated from the sample medium by means of a hydrophobic, gas-permeable membrane. The pH of the electrolyte changes if NH3 gas diffuses through the membrane. This
local change in pH is measured by the pH electrode as a high-resistance value.
Description
Gas-sensitive sensor for measuring ammonia (20.1030) |