FIELD: collar seals of movable joints of units and parts of machines. SUBSTANCE: located between working surface of seal and circular spring is torus sensor showing mechanical stressed state; sectors of this sensor are made from multi-component polymer possessing dependence between mechanical stressed state and electrical conductivity; they are provided with electric contacts. According to change in resistance of sensors, contact pressure in seal, wear of seal and thermal and dynamic parameters of present state of bearing unit are determined. EFFECT: enhanced reliability of seal serviceability. 3 cl, 1 dwg
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