Metal detectors are used to discover all kinds of metal impurities during the production process. Discovering metal impurities in heavy industry (mines, quarries, recycling, wood industry, …) is important for protecting the following processing procedure, where metal particles impair the production quality or disturb the production.
Metal detectors in heavy industry have the following common properties:

• detection of magnetic and nonmagnetic particles,
• high sensitivity, stability and precision,
• minimal number of false detections due to embedded analog and digital filters,
• automatic calibration for several years of stable operating,
• ability to detect the length of a metal impurity
• precise manual or automatic product compensation (self-learning),
• possibility of entering 30 different product settings,
• transparent and user friendly multi level menus,
• password protected critical settings,
• easy replacement of the power supply or processing module in case of malfunction,
• possibility of printing messages using the RS232 or RS485 communication,
• possibility of following detections or setting basic parameters on a PC using the RS232, RS485 or Ethernet communication,
• easy installation, removal and cleaning,
• casing made of high quality construction steel,
• possibility of marking the impurity,
• adaptation to customer’s needs.

THE MN-1 MARKING DEVICE
Metal detector is successful in locating the metal impurity if the conveyor belt is under a constant strain and thus has a constant stopping distance. If that is not the case the stopping distance varies and the product must be supervised over a greater distance which leads to the loss of time. In that case a marking device that drops a bag filled with sand over the metal impurity can be used and the impurity is easily located.
MDR has developed the following metal detectors according to customer’s needs: