PROALL P Series, Service Manual, Page: 33 / 118

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IMPORTANT!
The magnetic inductive flow sensor VMZ must only be used for measuring and metering liquids with a minimum
conductivity of 20 μS/cm. If your liquid is under this value or if the flow meter reads fine with water, but not
with your liquid then a different style of flow meter may be required. Contact your Proall representative for
more information.
5.6 PNEUMATICS
IMPORTANT!
The pneumatic system on the mixer body runs off the truck pneumatic system. The primary function of the
pneumatic system on the mixer body is to cycle the water ON/OFF valve, but it is also used for the cement
aeration system and winter blow down. Other optional functions like pneumatic fiber feeders can also be
added.

If the water ON/OFF valve is not working and there is no air
to the mixer body, make sure the air shut-off valve is not
closed.

Also ensure that the filter regulator pressure setting is at
or above 75psi. The regulator is equipped with an
automatic drain to expel and water in the bowl once it hits a
pre-set level.

The pneumatic valve manifold has three stations with
one being populated with a solenoid valve to actuate the
water ON/OFF valve and two blanks.

If air is leaking from any of the pneumatic valves or blanking
covers then they need to be re-sealed and/or replaced.
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