Device (10; 110; 210; 310; 410) for non-contacting determination of a state variable of at least one pipeline pig (12; 112; 212; 312; 412) which is displaceable in a supply path (14; 114; 214; 314; 414) and which includes a magnetic-field source (18; 118; 218; 318; 418), with a) a number of sensors (20; 120; 20; 320; 420) responding to the presence of the magnetic-field source (18; 118; 218; 318; 418); b) a circuit arrangement (34; 134; 234; 334; 434), to which a sensor-output signal (U A; U H) of the sensor (20; 120; 220; 320; 420) can be supplied and which generates an electrical output signal that is representative of the state variable of the pipeline pig (12; 112; 212; 312; 412) at the sensor (20; 120; 220; 320; 420), characterised in that c) a plurality of sensors (20; 120; 220; 320; 420) connected in parallel are arranged in succession along the supply path (14; 114; 214; 314; 414) in the direction of motion (16; 116; 216; 316; 416) of the pipeline pig (12; 112; 212; 312; 412); d) the circuit arrangement (34; 134; 234; 334; 434) includes means for determining electrical output signals from the sensor-output signal (U A; U H) that are representative of at least one of the following state variables of the pipeline pig (12; 112; 212; 312; 412) and/or of a coating material to be conveyed: da) the position of the pipeline pig (12; 112; 212; 312; 412) on the supply path (14; 114; 214; 314; 414), db) the distance covered by the pipeline pig (12; 112; 212; 312; 412) on the supply path (14; 114; 214; 314; 414), dc) the volume of coating material conveyed with the pipeline pig (12; 112; 212; 312; 412), dd) the volumetric flow rate of the coating material conveyed with the pipeline pig (12; 112; 212; 312; 412). a) a number of sensors (20; 120; 20; 320; 420) responding to the presence of the magnetic-field source (18; 118; 218; 318; 418); b) a circuit arrangement (34; 134; 234; 334; 434), to which a sensor-output signal (U A; U H) of the sensor (20; 120; 220; 320; 420) can be supplied and which generates an electrical output signal that is representative of the state variable of the pipeline pig (12; 112; 212; 312; 412) at the sensor (20; 120; 220; 320; 420), characterised in that c) a plurality of sensors (20; 120; 220; 320; 420) connected in parallel are arranged in succession along the supply path (14; 114; 214; 314; 414) in the direction of motion (16; 116; 216; 316; 416) of the pipeline pig (12; 112; 212; 312; 412); d) the circuit arrangement (34; 134; 234; 334; 434) includes means for determining electrical output signals from the sensor-output signal (U A; U H) that are representative of at least one of the following state variables of the pipeline pig (12; 112; 212; 312; 412) and/or of a coating material to be conveyed: da) the position of the pipeline pig (12; 112; 212; 312; 412) on the supply path (14; 114; 214; 314; 414), db) the distance covered by the pipeline pig (12; 112; 212; 312; 412) on the supply path (14; 114; 214; 314; 414), dc) the volume of coating material conveyed with the pipeline pig (12; 112; 212; 312; 412), dd) the volumetric flow rate of the coating material conveyed with the pipeline pig (12; 112; 212; 312; 412). da) the position of the pipeline pig (12; 112; 212; 312; 412) on the supply path (14; 114; 214; 314; 414), db) the distance covered by the pipeline pig (12; 112; 212; 312; 412) on the supply path (14; 114; 214; 314; 414), dc) the volume of coating material conveyed with the pipeline pig (12; 112; 212; 312; 412), dd) the volumetric flow rate of the coating material conveyed with the pipeline pig (12; 112; 212; 312; 412).