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Old 05-12-2014
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Airmar / Raymarine DST800 Transducer Issue

We have an Airmar DST800 triducer fitted to our XP38 supplied by Raymarine and installed by a professional marine electronics company of good standing.

The original installation was done when the boat was launched in 2012.

We had a failure of the automatic flap (which prevents water ingress when removing the transducer) after about 2 months and the installer hauled out the boat and replaced the faulty unit at their cost.

During 2013 we again had the flap fail.

In March 2014 we replaced the transducer and through hull with another DST800 during our annual haul out at our own cost, again it was installed by the same company.

After the second use the flap again failed...

From discussions I've had with the installer they don't believe they have done anything wrong, so hence I need to have the discussion with Raymarine. While I'm sure they will come to the party and replace the faulty unit I doubt they will cover any haul out or installation costs which obviously sucks big time!


So I am interested in finding out if other people have had issues with the Airmar DST800 tri-ducer, specifically in regards to the flap failing.

Also what are peoples opinion regarding installation / haul out costs? Should I push Raymarine into covering these..

Information I have from Raymarine is that Airmar made adjustments to the design in 2010 as they had issues with flap failures, I suspect they may not have sorted the issue.
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Old 05-12-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

The thru-hull has to be installed in the correct orientation for the flap to work reliably.

What is the nature of your failure? The flap can't be expected to completely stop water flow, only to slow it down considerably.
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Re: Airmar / Raymarine DST800 Transducer Issue

Nature of the failure is the flap falls out of the transducer tube and disappears. Hence we get a massive gush of water each time we change over the transducer for the blanking plug which is generally weekly in summer.

The water is easy enough to clean up however we would prefer to keep as much water out of the boat as possible for obvious reasons, hence wanting a flap that works more than once or twice

The company that has done the installation for us is one of the largest Raymarine installers in the area, and we have used them for fitting out of our past 3 yachts we have owned over the years. So I don't think they are installing it incorrectly.

Furthermore they are aware of all the tricks to look for during the installation from the following information from Airmar;

"The risk of the original valve becoming dislodged requires the ring to be positioned with the gap positioned directly over the valve hinge. Assembly instructions include the orientation of the snap ring with ring gap 180 deg from the valve hinge. An incorrectly positioned ring could occur during assembly, or during post-delivery handling. The ring can be rotated by hand from the "as assembled" orientation (180 deg from the valve hinge) during installation or subsequent handling. Please note, that with the snap ring gap located over the valve hinge (incorrect placement or subsequent manual rotation), the valve body remains securely retained within the housing, but includes a higher risk of failure due to the size of the snap ring gap and valve hinge. "


As indicated in my original post I'm curious to see if others have had similar issues with this transducer.
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Old 05-13-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

Weekly swap of the blanking plug and transducer? Do tell.

I've the same unit, though blank is only in place for the winter haul.
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Re: Airmar / Raymarine DST800 Transducer Issue

We normally remove the transducer after sailing if we are not using the boat for more than a few days.

Stops it from getting gummed up with growth on the speed sensor / paddle wheel.
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Old 05-13-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

I've had a few challenges with mine, but I simply can't be bothered swapping it out any more and often leave the blank in even when out sailing. It's one less thing to worry about where GPS speed is good enough.

To your question: IIRC there isn't just one flap, but two interconnecting flaps on opposite sides of the unit that close against each other - and I suspect mine is missing one, but I don't get all that much water in - certainly not full flow...

There are known issues around the size and lubrication of the O-rings on the body of the plugs, and if you try to force the plug in (or force it out more likely!) with an incorrectly sized or un-lubricated o-ring, you risk dislodging one (or more) flaps and losing them out the bottom of the boat. For this reason I'd find it really hard to believe they'd replace the unit no questions asked... but it'd be a bonus indeed if they were.
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Last edited by Classic30; 05-14-2014 at 04:26 AM.
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Re: Airmar / Raymarine DST800 Transducer Issue

Quote:
Originally Posted by wopalx View Post
Nature of the failure is the flap falls out of the transducer tube and disappears. Hence we get a massive gush of water each time we change over the transducer for the blanking plug which is generally weekly in summer.
That's a failure. *grin* Haven't seen that one so I'll bow out.

Definitely a problem. Golly.
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Old 05-14-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

Quote:
Originally Posted by SVAuspicious View Post
Definitely a problem. Golly.
Nah.. not really.

Even with only one flap, you get a darned sight less wet than doing the same thing 20 years ago. Anyways it's a good excuse to (a) wash the bilges out and (b) test the bilge pump.
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Re: Airmar / Raymarine DST800 Transducer Issue

Well if you pay for a product, several times, that is faulty it's a problem IMHO.

Issue with the water ingress is the transducer is located forward of an electrical distribution panel and all the electronic networks backbone. Salt water and electronics don't mix too well over the long term.

Also the water splashes all over the bow thruster, causing the s/s parts to corrode (s/s I don't think is as good as it used to be).

Have no issues with cleaning the bilge but fail to see why I should need to if the product worked as it's supposed to.

Quote:
Originally Posted by Classic30 View Post
Nah.. not really.

Even with only one flap, you get a darned sight less wet than doing the same thing 20 years ago. Anyways it's a good excuse to (a) wash the bilges out and (b) test the bilge pump.
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Re: Airmar / Raymarine DST800 Transducer Issue

So.. you hold the manufacturer responsible for the transducer being located in close proximity to gear that can get damaged by salt water? Why do you have all that stuff located in the bilge anyway??
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Last edited by Classic30; 05-14-2014 at 04:27 AM.
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