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    What is a non-ferrous detector and a ferrous detector?

    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 metals 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 while Km = 1 for cast iron, it is only 0.25 for copper.
    This is the conventional inductive sensor

    For both ferrous (steel, iron) and non-ferrous (brass, aluminum, 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

    Selective, either ferrous materials or non-ferrous materials
    The Schneider part numbers are: XS1M18PAS40x insensitive to ferrous materials, XS1M18PAS20x insensitive to non-ferrous materials
    They are called selective Ferrous/Non-Ferrous sensors.

    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 selective or non-selective 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 for inductive sensors

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