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An arrangement for detecting metallic particles carried by a fluid includes a metallic probe member which surrounds an elongated passage through which the fluid flows and which is constituted by a split tube having two marginal portions delimiting a gap which extends along said passage and completel

An arrangement for detecting metallic particles carried by a fluid includes a metallic probe member which surrounds an elongated passage through which the fluid flows and which is constituted by a split tube having two marginal portions delimiting a gap which extends along said passage and completely separates the marginal portions from one another. Capacitors are arranged at the gap and alternating electric current is caused to flow in the probe member around the passage so that the probe member and the capacitors form a tank circuit having resonance characteristics that are influenced by any inclusion then present in the passage in a manner dependent on the electromagnetic properties of the inclusion. The character of any metallic particle then present in the passage is determined from variations in the alternating electric current that reflect the influence of such metallic particle on the resonance characteristics.

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A probe for use in detecting individual metallic particles carried by a fluid continuously flowing in an elongated passage and including an inductive coil surrounding the passage, characterized in that the inductive coil is electrically configured as a single-turn electric conductor which has a leng

A probe for use in detecting individual metallic particles carried by a fluid continuously flowing in an elongated passage and including an inductive coil surrounding the passage, characterized in that the inductive coil is electrically configured as a single-turn electric conductor which has a length as considered in the longitudinal direction of the passage that at least equals the diameter of the conductor and has a gap extending over the entire length of the conductor and physically separating two longitudinally extending portions of the conductor from one another; and capacitor means is situated directly at said gap, is electrically connected between said portions of said conductor and is isolated from the passage.