Head
electronics
Head
electronics
Air
Oil
Water
Receiver crystal
Transmitter crystal
Oil
Water
Air
Fig 14 Interface detector by reflection method
Page 11
(iv) Check the incorrect operation has not been produced
by incorrect setting of the frequency selection switch or
an external short circuit on the auxiliary input terminals.
(v) The circuit board can be checked by linking the
sensor terminals 1 and 2 with a wire, to simulate an
oscillating sensor.
