28
N
S
S
N
T045-0003
Note the relation is inverse:
• To raise the displayed volume, the
PPU is lowered.
• To lower the displayed volume, the
PPU is raised.
Testing ow transducer
BROWN wire to positive of 12 volt battery.
BLACK wire to negative.
BLUE wire to multimeter positive.
1. Check the rotor turns freely.
2. Each vane in the rotor has a magnet in it
with the pole facing out. Check that the 4
magnets are present.
3. Check every second magnet has the same
pole orientation so the rotor magnets are N
- S - N - S.
4. Connect negative from multimeter to nega-
tive of battery.
5. Set multimeter to DC volt.
6. By turning the mill wheel slowly, this will register
approx. 8.0 +/- 1 volt with the diode on and 0.3
+/- 0.1 volt with the diode o with every second magnet.
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