How to fix a failing boat speed sensor

This is the second of a two part video showing an electrodiagnostic workup for an intermittently failing paddlewheel speed sensor for a boat.

Part 1 is here:

https://youtu.be/sA5Cr1aP3ek
These sensors are Hall effect sensors that send an analog signal to the computer. A simple algorithm for investigating and fixing a defective sensor is shown.

The sensor shown is from a B&G Hydra 2000 processor system, manufactured by Airmar, model ST650, in ~2005. Presently the ST850 is the replacement sensor for this P17 through-hull, and it is still available in an analog form. However if you decide to upgrade to the ST850 you need to buy an inexpensive valve kit (33-536-01) to retrofit the P17 to take the ST850 sensor. The spec sheet for the ST850 shows that it requires a little higher base voltage of 9V, and that would be worth discussion with Airmar support if you need to upgrade to the ST850. The paddlewheel appears to be the same and interchangeable for the two sensors. The replacement kit I used was the Airmar 33-113 ST650 paddlewheel and O-ring kit.

This demonstration is an amateur effort published for entertainment purposes only. If you choose to repair your own boat, do the research yourself to verify the appropriate workup you require. Any misadventure you encounter is at your own risk.
Music clip at the end was “Pacing” by Blue Dot Sessions from their Tiny Tiny Trio album, under CC 4.0 attribution,

http://freemusicarchive.org/music/Blue_Dot_Sessions/

Видео How to fix a failing boat speed sensor канала spelunkerd