Briefly Introduce The Working Principle And Characteristics Of Hot Metal Detector

Principle of Thermal Metal Detector: The lens transmits infrared thermal radiation from the measured object to the photoelectric conversion circuit, converts it into electrical signal, amplifies it and sends it to the electronic switch comparison circuit. When the radiation reaches the trigger point (different temperature trigger points can be set by itself to adjust the influence of Xiangjia temperature), the output circuit of the electronic switch It's triggered. At the same time, the specially designed electronic compensation circuit can compensate for the changes brought about by high temperature environment and device aging, and can work steadily and reliably in harsh environment without manual adjustment.


Instrument features: hot metal detector design features: generally completely sealed by epoxy resin in stainless steel sleeve infrared switch, strong and durable. It must be designed to be free from the effects of heavy industry such as steam, water, dust, shock, vibration and oil pollution. Its temperature compensation system can cope with the extremely changeable temperature environment. At the same time, it has an internal test circuit, which can be pre-checked before the formal test.


It can be designed as an integrated device or a long-distance optical fiber lens system. When water-cooled or air-cooled sleeve is added, it can also work in high temperature environment. In addition, the detector can rotate freely in several different axes by rotating the bracket.


The main characteristics of the thermal metal detector are very strong stainless steel shell, fully functional integrated design, LED array display infrared signal percentage instrument action threshold 109 grade precision adjustable power supply 24VDC or 85-240VAC measured temperature range from 270-1200 1ms response time relay output and NPN& PNP output, output delay 1; To 250ms, the user can set and realize remote self-inspection of fully sealed water-cooled sleeve. The spiral purge nozzle thermal metal detector uses linear germanium diode array as the detector device.


The microprocessor inside the thermal metal detector instrument can get the thermal radiation level received by each Germanium diode through the cyclic scanning of each Germanium diode on the array. Through the comparative analysis of these level signals, the thermal metal signal can be accurately and quickly identified from the complex background signal.