The wireless/HART adapter enables retrofitting of a wireless/HART interface for conventional 4 … 20 mA/HART sensors. The connection to wireless/HART networks, for example in modern tank farms, is simplified by this adapter. It is mounted directly to the cable entry or at a distance to the field device. The instrument contains a power pack and powers also the field device. Hence also independent measurement loops are possible. The rotatable antenna ensures optimum reception through suitable positioning.