DETEKTION AV OCH DETEKTOR FOER AVNOETNINGSPARTIKLAR.

摘要

The invention concerns a continuously operating analysis method of abrasion particles in which ferromagnetic particles which are present in a medium stream are allowed to collect by the action of a magnetic leakage flux emitted into the medium stream 3 from a gap in a magnetic circuit 6, the effect of the accumulated amount of particles is measured by a detector H1 positioned in this gap and this measured value is compensated with another essentially corresponding detector H2 positioned in the second gap that does not accumulate particles, the effect of the magnetic leakage flux for the accumulated particles is interrupted after the measured value has reached a predetermined limit Uh for the accumulated particles to be removed and damage in the origin of the particles is found from reduction of the scavenging time interval Tm which in each individual case disappears before the mentioned predetermined limit is reached. The magnetic circuit 6 is formed by a magnet with constant poles and a coil 12 is placed in one arm of the magnetic circuit whose poles are connected to a device 13 which reports the pulse height. An error alarm device 15 is programmed to produce a message in each case only when both detections for flow density 8 indicate a significant increase in abrasion particle accumulation rate and the detection of pulse height 13 indicates a significant increase in the size of the abrasion particles. <IMAGE>