Surface-sensitive properties of the sensor elements based on thin films of lead sulfide doped with halogens (chlorine, bromine and iodine) to lead ions in aqueous solutions in the concentration range 1.5 10-8 - 1.5 10-2 mol / l have been investigated. The influence of ammonium halogens in reaction mixture, structure and morphology of the films well as their response to the ions of lead were investigated. Reproducibility of the results were shown for several cycles for relaxation probe, as well as for the estimated drift of the electrode potential difference of the pair (sensing element - a standard silver chloride electrode).