A Guide To Installing The Sonihull Ultrasonic Antifouling System

Published: 05/19/14 at 08:23am

We've recently been getting calls regarding how to install a Sonihull ultrasonic antifouling system. Here we will walk you through the simple steps to installing this system properly.

Location Location Location!

First and foremost is determining where the transducer should be mounted. The transducer should be mounted near the center line of the hull in the aft 1/3 of the boat close to the propeller shafts, steering gear and trim tabs. This will cover most of the bases for the best possible protection. In our last blog, "Selecting the Right Sonihull Antifouling System For You" we discussed in depth about where to mount the transducers. Be sure to refer to that article for more information on this topic.

If you have the Sonihull Duo system you'll have two transducers, one should be located in the aft 1/3 of the hull and the front transducer should be mounted about 2/3 of the way forward mounting it near the center line of the hull.

Remember transducers are to be mounted in contact with the outer skin of the hull. If your hull is a sandwich construction please consult a marine specialist.

Mounting The Transducer Ring

It's very important that you take the time to properly prepare the hull for optimal performance of the transducers. Begin by sanding the hull surface smooth and flat. You want the surface of the transducer and hull to be completely flat for the best surface to surface transmission of the transducer pulse. Once the hull is smooth and flat make sure that both the hull and transducer faces are free of dust and grease.

Apply some petroleum jelly to the threads.

Apply petroleum jelly to the threads

Next apply some type of petroleum jelly to the threads of the mounting ring. Only a thin layer is necessary. The reason for doing this is to prevent any epoxy from making direct contact with the
threads. When applying petroleum jelly be sure to keep the outer face of the ring free from any grease.

Prepare the marine grade epoxy as per the manufactures instructions. If you take a look at the mounting ring you'll see a gutter. This is to capture any stray or excess epoxy before it gets to the threads. Apply epoxy to the face of the mounting ring. It is important that you apply a "full circle" of epoxy on the mounting ring face so that a complete seal between the face and hull can be made.

The gutter in the mounting ring.

The gutter in the mounting ring

Apply epoxy to the mounting ring.

Apply epoxy to the mounting ring.

Attach the mounting ring to the hull and allow the epoxy to fully set before you attach the transducer.

Attaching The Transducer

Prior to screwing the transducer to the mounting ring apply a thin layer of petroleum jelly to the face of the transducer. This will allow for a better contact between the surface of the transducer and the hull.

Transducer mounted to the hull.

Transducer mounted to the hull.

Screw the transducer into the mounting ring, making sure a firm contact has been made with the hull. However, make sure not to over tighten as this could cause the epoxy to break. It is very important to note that you do not remove the cable from the transducer.

Run the cables to where the Sonihull controller will be located.

Mounting The Control Box

The Sonihull system requires very little maintenance, this allows you a lot of flexibility when figuring out where to mount the control box. You can mount this out of sight such as a cupboard or engine room, giving your installation a nice clean look. As long as the location is dry and above the water line, with suitable access to mains and DC power, the Sonihull will be operational.

Control box securely mounted.

Control box securely mounted.

Do not power the unit on until the transducers are connected to the control box. Next connect the transducer cables to the control box and power on. You're done!

Still Have Questions?

All in all this system is easy to install, with no hull penetration required. The only things required are some simple tools and a couple hours of your time. But please if you have any questions don't hesitate to contact us and we'll gladly help you out. Call us at 425-355-3669 or email us at