58300000111195_ARA_en_f.doc – 02.06.09
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4.2 Flowmeter
The composition of the coffee
mixture is a well guarded secret of
the coffee roasting
establishments. To ensure that an
excellent coffee can be produced
from this secret, the coffee beans
must be roasted carefully and the
coffee machine controlled
precisely – unless the dosage is
constant, the quality of the coffee
cannot be maintained.
The flowmeter
(A)
is installed on the suction side between the water
tank
(B)
and pump
(C)
. To ensure a precise measurement result, the
flowmeter must be operated in a horizontal position.
4.2.1
Design and function
Water is pumped in from the water
tank and flows through the
flowmeter.
Water is supplied via the
connection pipe in the lower
section of the housing
(D)
.
Water is discharged via the
connection pipe in the upper
section of the housing
(A)
.
The two halves of the housing are
sealed with a silicone seal
(B)
.
The fan impeller
(C)
with the two
attached magnets is rotated by the
water flow.
The Hall-IC in the upper section of
the housing
(A)
generates square
pulses which measure the actually
required amount of water.
When installing the flowmeter, ensure that the
direction of flow is correct. An arrow on the
flowmeter housing indicates the direction of flow.
