pipe sections 116 mixing vessels 118 extruders 120 and other parts 122 and 124 which each receive quantities of spinning solution sufficient cause the spinning solution to pass through at least one temperature sensor is arranged in each of the sectors set up in this way to increase safety several sensors 110 112 can be arranged in a sector 122 preferably the temperature sensors consist of so called dual sensors dual sensors comprise two temperature sensors that measure the temperature of the spending solution at nearly the same location and relay a temperature signal to the system controller 124 wherein the temperature sensors of this sensor pair additionally compare the measuring results and issue a separate signal given deviations in the measuring results the separate signal also called a defect signal alerts the system controller to the failure of a temperature sensor in this embodiment the system controller 124 is connected by a safety circuit not shown with the individual companion heating systems 130 132 134 136 and 138 which can be automatically deactivated by the system controller 124 in response to a defect signal the embodiment of this invention with dual temperature sensors further enhances safety suitable temperature sensors are commercially available under the designation pt 100 measuring sensors detect a localized overheating of the spinning solution in at least one of the sectors and the temperature values are relayed to the safety circuit 170 the preset parameters of the first limiting temperature and the second limiting temperature are provided as switching points in the safety circuit the cited parameters are variable and set as a function of the used spinning solution in the present example a first limiting.