[en] The design and working principles of a position sensitive ionization chamber (PSIC) are described, which is used for a time- of-flight spectrometer. The chamber gives information on the energy, the time-of-flight and the coordinates of a detected heavy ion reaction products. The differential energy loss depending on Z can also be determined. Results of performance testing of the chamber are given. The PSIC specifications are presented. For the PSIC given configuration providing field uniformity above anode slit the determined energy range is restricted by the value <= 2 MeV/A for reaction products with A > 10. The PSIC time resolution is equal to 400 ps