BG80 USE AND MAINTENANCE BOOKLET
Rev.1 of 23/04/2013 of BG80 uk agg2013 Page 18 of 40
Step3
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The propeller must rotate in a clockwise direction.
When the tank is full, the rotation direction can only be identified based on the propulsion of the fluid in the
container: this should move towards the centre of the tank.
Operating the mixer in the opposite direction to the specified rotation direction may cause
strong vibrations and may result in serious damage to both the mixer and the tank.
Because the composition of the substrate to be mixed may vary, the immersion depth of the mixing propeller
should be adjusted and the complete immersion of the blade of the propeller during mixing should be verified.
Whirlpools or sprays of fermentation material must not occur during operation.
The mixer must only be used in a tank that is sufficiently full and with propeller blade cover of at least
0.5 m.
If the propeller is partly uncovered, a strong degree of lateral oscillation will be evident,
particularly in the motor-transmission unit. Such oscillation could cause damage to the mixer
and to the tank.
The mixer transmission may be damaged by excessive lateral thrust caused by excessive floating material; the
propeller blade may also be subject to excessive stress which may have negative consequences on the
stability of the tank.
During normal operation it is possible that the mixer may oscillate laterally; if this vibration occurs within a
range of a couple of centimetres, it should not be considered dangerous. This low level of oscillation is due in
part to the significant robustness of the machine frame.
It may be necessary to increase the number of motor revolutions to counteract more significant oscillations; this
operation may only be performed by fitting an inverter, following prior authorisation by the manufacturer.
