Hardi HC 2500 Series Instruction Book page 28

Note the relation is inverse:
• To raise the displayed volume, the PPU is lowered.
• To lower the displayed volume, the PPU is raised.
Testing flow transducer (Ref. no. 728816)
Wire connections: BROWN wire to positive of 12 volt battery.
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
negative 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 off with every
second magnet.
Testing speed transducer (Ref. no. 729058)
Wire connections: BROWN wire to positive of 12 volt battery.
1. Connect negative from multimeter to
negative of battery.
2. Set multimeter to DC volt.
3. By bringing the south pole of a magnet
(distance 5 mm +/- 2 mm) by the trans
ducer, this will register 0.3 +/- 0.1 volt.
4. By removing the magnet, this will register 7 .0 +/- 1.0 volt.
28
BLACK wire to negative.
BLUE wire to multimeter positive.
BLACK wire to negative.
BLUE wire to multimeter.
N
S
S
N
T045-0003
S
N
T165-0004