Abstract: Hotwire elements for thermal conductivity detectors, consisting of one or two individual nickel filaments with more than 200 ohm resistance at 20° C. and finer than 5 micrometers coating of polytetrafluoroethylene, wound with homogeneously distributed interspaces into a filled up to at most ? of its volume gas-permeable spherical or cylindrical body. Relevant hotwire sensors for thermal conductivity detectors, each comprising a wound on a holder filled element enveloped by fixed fillers forming a symmetric to it built-in cavity with a gas inlet and an outlet surrounding the element holder. Radii of the filled elements and their cavities are in proportion, at which minimum electric current is needed for heating the elements to desired temperature.