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Procedure to measure the milk froth height.
Manual system (CMF)
Pour 100cc. of milk at Trefr. in a beaker of 250 ml of capacity and with a inner diameter of 70 mm; with
machine in steam mode:
1. Place the beaker with the frother dipped in milk, dispensing steam and start the chronometer.
2. After about 30 to 60 seconds, stop the steam and check the result on milk.
Automatic system (Latte Go)
After setting the machine to delivery of 120gr. of product:
1. Launch the “hot milk” function.
2. Collect the product in a beaker with a 250ml of capacity and with an inner diameter of 70 mm, and verify
the result obtained on milk. Carry out the test using milk at a Trefr..
In case the machine allows modify of the emulsion through the menu, use the machine with the emulsion set
to the default value.
Related to the above testing procedure derives the following table of acceptability:
Grams of product
Minimun height of the milk cream
≥ 130
≥ 30mm
120
≥15mm
110
≥ 22mm
100
≥ 20mm
90
≥ 16mm
80
≥ 13mm
70
≥ 11mm
To verify the height of the cream, a practical example is to add to dispensed product a small amount of
coffee. The addition of coffee immediately highlights the surface of separation between liquid and cream.
Operating logic
Switching on
When the machine is switched on, the gear motor repositions itself as follows:
- It acts on microswitch 1
- The gear motor changes its rotation direction and moves upwards again by approx. 1-2 mm.
- The boiler begins to heat the water for approx. 45 sec, in order to reach the optimal temperature
(established by the software).
The gear motor is powered by a direct current motor that engages with the smaller double toothed wheel
using a worm screw. The unit is mounted on the axle of the large gear wheel and when a coffee is requested,
it moves from the standby position to the dispensing position, and then back to the standby position again.
The microswitch indicates to the gear motor when the brew group is in the work position or home position.
- Standby position: 1
- Dispensing position: 2
Temperature sensor (adjustment)
Temp. (°C)
R nom (kΩ)
ΔR (+/- %)
20
61.465
4.0
50
17.617
3.1
75
7.214
2.4
80
6.121
2.3
85
5.213
2.2
90
4.459
2.1
100
3.3
1.8
125
1.653
2.4
150
0.893
2.8
An NTC is used as a temperature sensor; in the event of overheating this reduces boiler element power
consumption. The electronic system detects the current boiler temperature from the drop in voltage of the
sensor and adjusts it accordingly. Heating element values and corresponding temperatures: see table.
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Technical information
Technical information
