Echo Sounder in Air?

[Richard10002]

Ready for launch tomorrow, I've scraped most of the antifoul off the echosounder transducer, (should've done it straight after painting but.... ), but I am getting no reading. Everything else electronic is working fine.

Should it work in air out of the water? If so, have I probably still got a layer of antifoul on it, and would that make the difference?

Many Thanks

Richard

 

[Athene V30]

Mine never works out of water. Display just says OUT.

 

[Davy_S]

If you switch the sounder on, then place your wet palm up to the transducer you should feel it pulsing. Antifoul over the transducer will make no difference (I antifoul mine) some transducers shoot through the hull so a bit of antifoul should not stop it working.

 

[Impaler]

Or the Memsahib's tongue.

 

[Gwylan]

Put a bucket of water on the ground under the transducer and you should get a reading about x4 the actual depth.

 

[Richard10002]

[ QUOTE ]
Put a bucket of water on the ground under the transducer and you should get a reading about x4 the actual depth.

[/ QUOTE ]

I can hear it clicking and, with the bucket of water, it read 5.8m - amazing!

No feeling with a wet hand /forums/images/graemlins/smile.gif

Thanks for the help

Richard

 

[Malcb]

The reason for not painting antifoul over the transducer is that in the past some solvents have reacted with the plastic iof the transducer and softened them. It doesn't seem to happen now, probably different solvents are used in the antifoul.

 

[rhumlady]

"I can hear it clicking and, with the bucket of water, it read 5.8m - amazing!"

Speed of sound in air is slower than in water and where the sound hits the water it reflects off the water as the air water interface acts as a mirror to sound hence you get duff readings when you have an internal transducer and there is an air bubble between the transducer and the hull. I used to get duff readings when going astern with air bubbles running under the hull - my transducer was just under the engine for some reason.

 

[Danny]

Richard, check out this thread.