[en] The model DYS-92 low background liquid scintillation spectrometer as an new innovation is developed. It is specially designed for measuring extra-low level tritium and ¹⁴C in the environment. Of course, other isotopes, such as ⁸⁵Kr, ³⁶Cl and trace isotopes in the environment can also be measured. DYS-92 is controlled by Z80 main plate in the main instrument box and a microcomputer. Nex electronics has been designed. The software includes: operation, data processing and spectrum analysis. The bismuth germanate (BGO) crystal is applied as an anticoincidence shielding with higher γ efficiency and is lighter and smaller than NaI (Tl) crystal. A lot of messages can be observed from the screen of the computer during measurement, such as counts of each channel, energy spectrum, time, parameters of the measuring process, etc. The statistical data-processing is made in the course of measurement. All of the counts and spectra for any sample can be displayed on the screen by pushing keys. The figure of merit can be calculated from the spectrum by the microcomputer. In particular, the selection of ³H, ¹⁴C measuring channel can be completed after or before the measurement. In either case, the ¹⁴C dating of the sample or the calculation of the concentration of tritium in water can be fulfilled automatically