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Old 01-20-2021, 05:41 PM   #1
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Depth sounder replacement

I am pulling the boat for work in March. It will be on the dry for few days. One of my goal is the replace my depth sounder. It is not working. I would need some guidance, based on experience, how to do it and what to watch out for?
I attach a photo. Can you identify this model and what can I replace it with?
Thanks.

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Old 01-21-2021, 11:54 PM   #2
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The photo is just the transducer for the depth sounder. Their is or was the helm mounted depth sounder. While most transducers are made by one company (Airmar) the depth finder is usually paired with the transducer. Do you have the depth sounder at your helm? It is not uncommon in older boats that an older sounder might have been removed but the hull mounted transducer was left in place. Otherwise you would need to glass over the hole. If this is the case you likely will want to buy a new depth sounder that meets your needs and have the new thru hull transducer installed in place of this old one. There are many options ranging from a basic digital depth display to forward scanning sonars.
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Old 01-22-2021, 01:50 AM   #3
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Have you followed the cable from the transducer to see where it goes? It maybe a left over transducer from a previous depthfinder. Or it may be the current transducer that doesnít work. If it is the current transducer then just remove it and replace it with a new one. If it is an old out of use transducer then I would remove it and glass the hole closed. To remove it can be easy or very difficult depending on what they used to install it. If they used 5200 it can be challenging to get it out. You can use a heat gun to try and soften the 5200. There is a product called Debond that is reported to work well in removing 5200. If you are going to replace it with a new one try to find one with the same size transducer so it will fit into the existing hole, but a lot of them fit the same size hole. Good luck.
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Old 01-22-2021, 08:23 AM   #4
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I should have given more info.

Yes, this transducer is connected to a Garmin chart plotter. It was working for few months, after I bought the boat 2 years ago. Later, it started to give false readings, or no readings.
The cable from the transducer runs up around the wall somewhere and ends up in the back of the plotter.

I looked up on the web this model (Airmar B150M 12degree) and it is available. What I could not figure out is do I buy stainless steel, or bronze? My boat is steel.
What is the material I need to use to seal the space between the unit and the hull? Can I use the existing elements for the installation, or everything needs to be new? I have never done this job, so I am not clear on everything.

Finally, can I, should I, look into newer models for replacement, or just buy the same model? I donít need anything special, just a solid depth measurement.

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Old 01-22-2021, 08:28 AM   #5
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Old 01-22-2021, 08:53 AM   #6
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Old 01-22-2021, 08:57 AM   #7
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