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Rev. May 2001 GraviMaster-FGB-M05 (S) Page 45
Gravimetric Blender
6.0 MAINTENANCE AND REPAIR
Make sure ,when maintenance or repair is carried out, the power is shut off (by pulling the
plugs out) and the air pressure (by disconnecting the air pressure).
6.1 Maintenance
Everything is set right and tested in the factory, adjustments should only be carried out if a
part of the machine is not working correctly
Air pressure: Set air pressure to about 6 bar for best accuracy. However, lower
pressure will work. If your plant air fl uctuates, set the regulator to the
low end so that the dispense valves always see a consistent pressu re.
Level sensor: The sensor should protrude into the mixer chamber about 1 cm past
the inside surface of the stainless mounting plate. If it protrudes too
far, it will sense the mixer blades. If it does not protrude far enough, it
will sense the mounting plate itself.
Adjusting sensor sensitivity:
At the end of the sensor is a small screw, with this the sensitivity is adjustable.
step1: fi ll the mixer chamber until the sensor is covered.
step2: turn screw counter-clockwise until the led goes on (if the led already
is on, then turn clockwise until led goes off and proceed with step 4).
step3: turn screw clockwise until led goes off.
step4: turn screw another 3/4 turn clockwise.
step5: Empty the mixer chamber and check to be sure the sensor does not
react on the mixer blades.
Weighbin dump valve:
The weighbin dump valve should open and close smoothly. Two
airfl ow regula tors are attached on the cylinder. This can be adjusted
by the screw that is on top of it.