A hot metal detector is a photoelectric detection device that identifies the front and direction of hot metal movement. The hot metal detector consists of a photoelectric conversion line, an electronic switch comparison output line, and an electronic compensation line. Its working principle is that the lens will be measured by the infrared heat radiation emitted by the object transmitted to the photoelectric conversion line into electrical signals and amplified and sent to the electronic switch comparison line, when the amount of radiation reaches the trigger point (can set their own different temperature trigger point, adjust the best temperature impact), the electronic switch output line will be triggered. At the same time, the specially designed electronic compensation line can compensate for changes brought about by high-temperature environments and device aging, without manual adjustment, and can work continuously in harsh environments stably and reliably.

The infrared switch, which is generally made of epoxy resin completely sealed in a stainless steel sleeve, is sturdy and durable. It must be designed to withstand the heavy industrial environment of steam, water, dust, shock, vibration, and oil. Its temperature compensation system can handle extreme temperature variations. It also has internal test circuitry for pre-checking before formal testing. It can be designed as a monolithic device or with a remote fibre optic lens system. With the addition of a water or air-cooled jacket, it can also operate in high-temperature environments. In addition, it is possible to rotate the detector in several different axes using a swivel mount.

The lens transmits the infrared heat radiation from the measured object to the photoelectric conversion line to convert it into an electrical signal and amplify it to the electronic switch comparison line, and when the radiation reaches the trigger point (you can set different temperature trigger points by yourself to adjust the best temperature impact), the electronic switch output line is triggered. At the same time, the specially designed electronic compensation line can compensate for changes brought about by high-temperature environments and device aging, without manual adjustment, and can work continuously in harsh environments stably and reliably.