Hydrocyclone for detecting formation of a roping state

A hydrocyclone for separating feed into overflow and underflow, comprising:

• (i) a feed inlet;
• (ii) an overflow outlet;
• (iii) an apex for discharging underflow;
• (iv) an upper section connected to the feed inlet and the overflow outlet;
• (v) a conical section between the upper section and the apex, the conical section is divided in separate upper part and lower part in an axial dimension;
• and
• (vi) a plurality of electrodes for measuring electrical conductivity inside the hydrocyclone to detect the formation of a roping state in the hydrocyclone;
• wherein the plurality of electrodes is positioned circumferentially in the conical section on an axial distance from the apex (dmeas);
• wherein dmeas is at least 5 percent of the axial distance between the apex and the upper section, and dmeas is at most 50 percent of the axial distance between the apex and the upper section;
• and
• wherein the plurality of electrodes is positioned substantially horizontally, perpendicular to the axial dimension, within an annular gasket, the annular gasket is located between the upper part and the lower part of the conical section.