A method and an apparatus for automatically detecting the intactness of ground electrodes in the bath of an induction furnace are described. According to the method a low DC or AC current is applied to an additional insulated electrode extending through the furnace bottom and being in connection with the melt. After melting of the charge this current is measured and compared with a reference value. If the magnitude of the current drops below the reference value an alarm signal is generated. Furthermore, methods and devices for localizing a ground fault are described. By this, the security of the operation of an induction furnace is improved.

A method and an apparatus for detecting a ground fault in an induction furnace as well as an induction furnace are described. When a ground fault is detected by means of the ground-fault detector the ground fault is localized. By doing this it is determined if the ground fault is caused by a failure of the refractory lining or by other reasons. If the ground fault is caused by other reasons it is ascertained if it is caused by a defective magnetic yoke insulation. Furthermore, it can be ascertained which magnetic yoke of the induction furnace causes a ground fault. In this manner the induction furnace can be operated with improved security and smaller expense.

An electric arc furnace has a safety device (3) connected to an earthed peripheral device. An earth cable (4) is provided to the peripheral device of the arc furnace (2). An ammeter (6) measures the current across the earth cable (4). A circuit breaker (8) in the earth cable (4) has a tripping time of less than 100 ms.

A system and method for facilitating the maintenance of an industrial heat treating furnace are disclosed.

An oven includes a temperature sensor, a memory that stores risk information, including a plurality of risk levels in correspondence with a plurality of temperatures and a plurality of cooking states of the oven. One or more processors identify the risk level of the oven based on the risk information stored in the memory, the risk level corresponding to the cooking state of the oven and the temperature, detected through the temperature sensor, in a cooking chamber of the oven, and control an opening operation of an oven door based on the risk level of the oven, wherein a speed at which the door is opened and a degree to which the door is opened are determined based on the risk level identified by the one or more processors.

The present disclosure discloses a reflow oven, comprising a heating zone, a cooling zone, a barrier and exhaust zone, a gas exhaust passage, a gas exhaust power device, and a detection device. The heating zone comprises a heating zone inlet and a heating zone outlet. The cooling zone comprises a cooling zone inlet and a cooling zone outlet. The barrier and exhaust zone is located between the heating zone outlet and the cooling zone inlet. An inlet of the gas exhaust passage is communicated with the barrier and exhaust zone. The gas exhaust power device is disposed on the gas exhaust passage. The detection device is disposed on the gas exhaust passage and used for detecting parameters of gas in the gas exhaust passage, wherein the parameters of the gas reflect a blockage condition of the gas exhaust power device.

A flame analytics system that may incorporate a burner, one or more sensors at the burner, a historical database connected to the one or more sensors, a model training module connected to the historical database, and a runtime algorithm module connected to the one or more sensors and the model training module. The runtime algorithm may compare realtime data from the one or more sensors and historical data from the model training module in accordance with a machine learning algorithm. The system may further incorporate a fault detection module connected to the runtime algorithm module, a fault diagnostics module connected to the fault detection module, and an enunciator connected to the fault detection module. The one or more sensors may also include having video or acoustic sensitivity of combustion in the burner.

A furnace monitoring system for monitoring a furnace over a span of time during furnace operation, including a thermal imaging apparatus, the apparatus is disposed outside of the furnace and at a distance from the exterior of the furnace to generate field signals of the furnace; a signal processing unit configured and programmed for receiving the field signals and generating a temperature map of the exterior of the furnace; and a means for displaying the temperature map locally or remotely. Wherein in that the furnace monitoring system is a system for monitoring the furnace over a span of time during furnace operation and in that the generated temperature map is divided into several zones, which correspond to different components of the furnace selected from burner, viewing port for burner observation, charging port, discharging port and flue gas channel.