Disclosed is a process for producing branched polymers including at least 50 mol % C3\u2013C40 olefins. According to the invention, at least one displaceable engaging element and one spring-loaded pivotable drive lever which engages in a direct or indirect manner with said element is provided for the movement thereof in or out of the engaged position for the maintenance thereof. Each transmitter unit is adapted to transmit a warning signal when actuated that is received by detector units that communicate with control means operable to determine the position P in the passenger cabin of the transmitter unit that has been actuated. Torch provided with such a cap and its use in a steel plate plasma cutting operation.