The inductive conductivity transmitter model ACI-Z serves to measure the specific conductivity in liquid media. It is especially recommended for use in media in which largescale deposits of particles of dirt, oils, greases; or where gypsum and calcium precipitations are to be expected. Specific conductivity can be recorded almost maintenancefree by this inductive method of measurement in even the most difficult media. In contrast with the conductive method of measurement, problems such as electrode decomposition and polarization do not occur. The transmitter has been designed for service in the field. A ruggedized housing of glass-fibre-reinforced polyamide protects the electronics and electrical connections against aggressive environmental influences (protection IP 65). The device has a three-wire transmitter for conductivity and a two-wire transmitter for temperature (output signals 4 - 20 mA) Normally the temperature effect must be compensated because the conductivity depends largely on the temperature of the medium. The measuring instrument is fitted with a temperature detector (Pt 100) and compensator. A temperature coefficient can be set in the range 0-3 %/K by a scaled potentiometer. The measuring cell comprises a hermetically sealed PVDF body in which two measuring coils are arranged. Holes in the measuring cell allow the measured medium to flow through. The measuring cell is to a large extent stable with respect to temperature and pressure. Due to the measuring system, measured medium and signal output are separated electrically.