A mass-analyzer relates to mass-spectrometric equipment and may be used in sector mass-spectrometers based on constant magnets. The mass-analyzer comprises a magnet system, a regulating device, a camera with a source of ions, a camera of the analyzer and an ion detector. The magnet system comprises a constant magnet composed of at least two parts having gaps between the last ones. The regulating device is made as a bridged circuit made from soft –magnetic plates located in gaps between parts of the constant magnet and capable of longitudinal motion along gaps. The proposed analyzer provides decrease in energy consumption and simplification of construction due to new regulating device.
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