Abstract: The heating plate (1) has cavities (2), in which electrically heatable heating bodies (3) are disposed. A heat exchange medium circulated by a pump (4) transmits the heat emitted by the heating bodies (3). The heating plate is designed to obtain a uniform temperature distribution using as low a volume of heat exchange medium as possible. To this end, the cavities (2) are elongate and the heating bodies (3) are bar-shaped.

Abstract: The roof or facade cladding comprises panel-shaped construction elements (1) arranged in a scale-type pattern, and each construction element (1) comprises at least a panel part (2), a frame and at least one retaining element (6). Each construction element (1) is secured by the at least one retaining element (6) on an essentially horizontally disposed support element (27). Each retaining element (6) is disposed on the respective construction element (1) adjacent to a bottom, essentially horizontally oriented edge (5) of the construction element (1) and the point (20) of the retaining element (6) contacting the support element (27) lies closer to this bottom edge (5) than the top edge (11) of the construction element (1). Each construction element is protected from mechanical damage all the way round at the edges the frame.

Abstract: The heating plate (1) has cavities (2), in which electrically heatable heating bodies (3) are disposed. A heat exchange medium circulated by a pump (4) transmits the heat emitted by the heating bodies (3). The heating plate is designed to obtain a uniform temperature distribution using as low a volume of heat exchange medium as possible. To this end, the cavities (2) are elongate and the heating bodies (3) are bar-shaped.

Abstract: A current sensor for measuring a time-varying electrical current (Im) in a portion of primary conductor (1), the sensor including a sensor conductor comprising first and second ends (3,4) for connection to a signal processing circuit, a first conductor portion extending from the first end and having a plurality of windings (5) to form a first coil portion, and a second conductor portion returning to the second end. Centres of the windings define a median coil place substantially parallel to the magnetic field (Hm) generated by the time-varying current (Im) to be measured, the sensor conductor defining one or a plurality of interference field surfaces as seen projected on a plane parallel to the median plane enclosed by clockwise or anti-clockwise interference field current circulating portions (22,23) of the sensor conductor.

Abstract: The current to be measured (I) passes in a conductor (1) enclosed with a Rogowski coil (4) and in the proximity thereof are arranged several magnetic field detectors (3). The sum of the signals from these detectors, formed in the device (2), and the signal supplied by the Rogowski coil are applied to a signal processor (7). The processor (7) comprises, for example, a first order delay device connected to the Rogowski coil output and means for amplifying/reducing the signals followed by adding means, the delay time constant and the amplifying/reducing factors being selected so that the device output (8) signal is proportional to the intensity of the current to be measured in a very wide frequency range, i.e. from 0 to more than 10 MHz.