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    What is the operating principle of an XS1 ferrous/non-ferrous detector with materials?

    Difference between ferrous product to be detected and non-ferrous product to be detected

    • Ferrous products:  any steel
    • Non-ferrous products: any metal except steel (brass, copper, etc.)
    Caution, non-ferrous does not mean any material (wood, plastic, etc.)
    Difference between ferrous sensors and non-ferrous sensors
    There are sensors which can detect:
     

    Ferrous metals as a preference (steel, iron)
    The sensing distances for these products vary according to the metals to be detected: maximum for ferrous and dependent on a Km coefficient typical of each metal (value between 0 and 1: Km = 1 for steel) 
    This coefficient reduces the sensor detection range. For example if Km = 1 for cast iron, it is only 0.25 for copper.
    This is the conventional inductive sensor
     

    Both for ferrous (steel, iron) and non-ferrous (brass, aluminium, copper, etc.) metals
    The sensing distance for these sensors is the same for both ferrous and non-ferrous materials. The Km coefficient is always 1
    They are called Ferrous/Non-Ferrous sensors.
    The Schneider part numbers are: XS1M18KPM40x, XS1M30KPM40x 18 and 30 diameter sensors respectively and XS7C40KPM40
     

    Difference in detection principles 
    For both sensors, an LC oscillator creates an electromagnetic signal.

    The difference in detection principles for the two types of sensor lies in:

    • Attenuation of the oscillation amplitude for ferrous materials, it is significant for ferrous materials and insignificant for non-ferrous materials
    • Variation in oscillation frequency for ferrous/non-ferrous materials. For high-frequency operation (in the region of one MHz), both types of material (ferrous and non-ferrous) have the same effect on the oscillation frequency variation.

    Km coefficient depending on the different metals

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