Temperature rise in sealless magnetic driven pumps
In sealless pumps with magnetic couplings and metallic containment shells, eddy currents are generated which lead to heat and cause temperature rise of the pumped liquid inside the containment shell. In order to prevent inadmissible temperature rise, this heat must be dissipated through an internal cooling flow. However, below minimum flow, the temperature will rise remarkably. Dry running is the worst of these flow related conditions. The heat built up in the containment shell can cause temperature rise of more than 200°C (392°F) within seconds, this can cause the magnets to demagnetize if the temperature is not reliably monitored.

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