4.7. Flowmeter
4.7.1. Mode of operation
Flowing water turns the impeller (rotor) running on the middle axle of the white plastic
flowmeter. The flowmeter are located on the right side of machine, under the tank base.
The two magnets fitted to the rotor send signals which allow a reed contact to count the
number of revolutions. The pulses generated are transmitted to the control system. This
allows the amounts of coffee or hot water to be dispensed in ml (millilitres).
4.7.2. Replacing the flowmeter
Removing the flowmeter
• In the event of clogging or scale build-up.
• Replace defective flowmeter if the contacts
are oxidised.
Remove water tank
Remove the 5 screws from the tank base
(2 are located on the top of the tank base,
2 on the bottom, and one in front, behind
the drip tray.)
• Make a note of the hose connections!
Detach supply hoses for flowmeter on tank
base and overflow hose
• Make a note of the connector sequence!
Disconnect cable connectors (arrow)
Turn cover of flowmeter to the left and lift
off
Check that rotors turn easily
Check flowmeter for dirt
• CAUTION! Check that piston upper o-ring is
correctly seated
Assemble flowmeter
4.7.3. Technical data
Flow rate: 0.033-2 l/min
Pressure range: -1 bar 0.3 bar 20° (-14.5 psi 4.35 psi /68 °F)
Nozzle sizes: ∅ 1.2 mm
Voltage: 4.5-24 V DC
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