Ammonia means the basic aqueous solution of ammonia. It can be denoted NH3 • H2O, NH4OH or better aqueous NH3. It is therefore the product of the dissolution of ammonia NH3 in the gaseous state in water.

Some of the uses of ammonia are: the manufacture of textile fibers and their finishes, papers and coatings, and also used in the chemical and pharmaceutical industry.

Thanks to its PTFE cable and its PVDF casing, the TUBA 125C can be used to regulate / detect a level in amonia.