C120W with AirMar P66 Not Recording Speed

[Chuck - Raymarine - Moderator]

ProLine23Sport,

Mechanical transducers do not have wires attached to the paddlewheel. The design of these transducers utilize a coil within the body of the transducer and magnets within the paddlewheel itself. Rotation of the paddle while causes electrical pulses to be generated an transmitted through the transducer's speed leads. Failure of the transducer to produce such speed pulses is typically caused by fouling of the transducer, water ingress into the transducer's speed sensing coil, or damage to the transducer's cable. In the case of a P66 transducer the problem would be rectified by replacing the transducer with another E66054 P66 Transducer.