Patent ID: 8805308

Claim:
An arrangement for achieving intrinsic safety of a radio transmission module with an HF power stage (RF-P) and an electronic control unit (Se) on a board for transmitting signals and measured values in an explosion-hazardous area, which includes an external voltage supply, an antenna connector (Aa) and an input connector, characterized in that at the base of an antenna (A) at least two independently operating hardware circuits (P 1 , P 2 , P 3 ) are arranged for rectification of output voltage of the HF power stage (RF-P) and for comparison with a maximum admissible value, each comprising one rectifier circuit (GL 1 , GL 2 , GL 3 ) and one comparator (K 1 , K 2 , K 3 ) whose outputs are connected via a control circuit (Se) with a limiter circuit (Bgr) for switching off voltage supply or for limiting output power of the radio transmission module to a maximum admissible value.