User`s manual

63
Magtrol WB/PB Dynamometers
Chapter 3 – Cooling
3.4.6 condenSAtion
Caution: when the dynamometer is at a standstill, the Cooling water must
be turned off. this reduCes the level of sCale deposits and, even
more important, avoids Condensation.
As a general rule, condensation occurs in the dynamometer when the outlet temperature of the
cooling water is lower than the ambient temperature in the room. When using a PB Series Magnetic
Powder Dynamometer, the condensation oxidizes the powder which leads to a decrease of the
braking torque. This happens very quickly and forces the user to send the dynamometer back to
Magtrol for replacement of the magnetic powder. On WB Series Eddy-current Dynamometers, the
condensation generates rust on the internal components which rapidly reduces the operating life of
the dynamometer.
3.5 COOLING CIRCUIT PURGING
Prior to storing the dynamometer for a long period of time, the water remaining in the cooling circuit
must be blown out with (preferably lubricated) compressed air.