Abstract: A method for digital wireless communication through a barrier (6) made of a conductive material, preferably metal, consisting in transmission of an encoded digital information using a transmitter (1), by generation of a static magnetic field with a stepwise variable spatial orientation of the magnetic induction vector on a first side of the barrier (6), then reading a resulting spatial orientation of the magnetic induction vector on a second side of the barrier (6) using an at least one spatial orientation sensor of the magnetic induction vector located in a receiver (3), and subsequently decoding the digital information from the stepwise variable spatial orientation of the magnetic induction vector by means of a reading system (4) connected to the receiver (3). The invention comprises also a system for performing digital wireless communication through a barrier and a system for monitoring the level of fluid content in a metal air-tight container.

Abstract: The present invention relates to a liquid gas level measuring system for use in a liquid gas tank and designed to cooperate with a float level gauge head mounted on the gas tank and made of magnetically inert material. The system comprises a dial module 1 attachable to the float level gauge head and a sensor module 2 releasably connected to the dial module 1. The dial module 1 is provided with at least one directing dial magnet 103 magnetically coupled with a drive magnet of the float level gauge. The sensor module includes a Hall effect sensor, a battery 204 and a radio module with an antenna 205, allowing wireless measurement data transmission to a remote location.

Abstract: The present invention relates to a liquid gas level measuring system for use in a liquid gas tank and designed to cooperate with a float level gauge head mounted on the gas tank and made of magnetically inert material. The system comprises a dial module 1 attachable to the float level gauge head and a sensor module 2 releasably connected to the dial module 1. The dial module 1 is provided with at least one directing dial magnet 103 magnetically coupled with a drive magnet of the float level gauge. The sensor module includes a Hall effect sensor, a battery 204 and a radio module with an antenna 205, allowing wireless measurement data transmission to a remote location.

Abstract: The invention relates to an automatic cylinder changeover device (1), comprising two gas inlets for mounting gas cylinder banks, namely the left gas inlet and the right gas inlet, a gas outlet through which gas may be discharged and a valve suitable for connecting said left gas inlet or said right gas inlet with the gas outlet and configured for automatically reversible switching between these two connections, characterized in that the device (1) comprises an indicator, suitable for being manually set in one of two distinct positions, one of said positions indicating the left gas inlet and the other of said positions indicating the right gas inlet and comprises means for detecting the position of the indicator, including at least one sensor (5), preferably a pair of sensors (5). The invention also covers a method for monitoring a gas installation equipped with such automatic cylinder changeover device.

Abstract: The invention relates to an electric circuit of a generator of oscillations, comprising an enhancement-mode field transistor T1, inductance L1 and resistance R1 connected to the source or the drain of the transistor T1, characterized in that the inductance L1 is connected directly between the gate and the drain of the transistor T1 or to an electric circuit of a generator of oscillations, comprising an depletion-mode field transistor T1, inductance L1 and resistance R1 connected with its one end to the source of the transistor T1, characterized in that the inductance L1 is connected directly between the gate of the transistor T1 and the other end of the resistance R1.

Abstract: The invention relates to an electric circuit of a generator of oscillations, comprising an enhancement-mode field transistor T1, inductance L1 and resistance R1 connected to the source or the drain of the transistor T1, characterized in that the inductance L1 is connected directly between the gate and the drain of the transistor T1 or to an electric circuit of a generator of oscillations, comprising an depletion-mode field transistor T1, inductance L1 and resistance R1 connected with its one end to the source of the transistor T1, characterized in that the inductance L1 is connected directly between the gate of the transistor T1 and the other end of the resistance R1.