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Airmar Retractable Thru-hull Transducer

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Samtutuki View Drop Down
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Joined: 12 November 2013
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    Posted: 04 April 2018 at 01:35
Like most (?) Hanse owners my 315 is fitted with a retractable thru-hull Airmar speed/depth/temperature transducer.

Mine is a DST800 housed in a P617V fitting. Where the P denotes Plastic and the V denotes that it has an integral valve which, while not watertight, significantly reduces the inflow of water when removing the transducer.

Except, that is, when the vale fails to operate correctly.

Which is what has happened to me.

Now when removing the transducer there is a gush of water while I hurriedly insert the blanking plug.  I estimate about 4 litres comes onboard.  So what you might well ask - just pump the bilge dry.  And yes I agree but I would rather the valve worked as designed.

Has anyone else had this problem?

A search of the Airmar website revealed this interesting document:


On page 4 there is an instruction covering servicing of the valve and an exploded drawing.


What is not clear to me is whether this operation can be undertaken while the vessel is in the water or only when slipped?

Comments and contributions welcome.
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Admiral
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fendant Quote  Post ReplyReply Direct Link To This Post Posted: 04 April 2018 at 03:04
The manual says clearly on page 3 , that the valve is not watertight! Normally you only get .5 - 1 ltr of water into the bilge pulling the sensor and inserting quickly thereafter the watertight plug.
 
My suspision is that you have something ( barnacles or clams ) inside the sensor housing, which prevent the valve closing. Do not attempt to undertake the procedure on page 4 when in the water!  Just check when your boat is on the hard, clean the transducer housing and check valve Operation.
Frank
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Samtutuki View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Samtutuki Quote  Post ReplyReply Direct Link To This Post Posted: 04 April 2018 at 04:38
Yes I read that about the valve not being watertight which is why I said as much in my original post.

What I don't get is that the manufacturer no where in the instructions issues any dire warning about trying this procedure with the boat in the water. 

 In view of the litigious nature of life in the USA Airmar's silence on this matter is interesting.
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Admiral
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fendant Quote  Post ReplyReply Direct Link To This Post Posted: 04 April 2018 at 11:01
Good point, maybe they assume that Non US citizens use common sense Wink
Frank
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cptgood View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cptgood Quote  Post ReplyReply Direct Link To This Post Posted: 04 April 2018 at 11:32
Hi,
probably the valve itself broke , the  metal spring corroded , as mine did.
 Now I've changed it and only about a litre comes thru.
Hanse320 - Hull#100/08
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Samtutuki View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Samtutuki Quote  Post ReplyReply Direct Link To This Post Posted: 04 April 2018 at 11:47
Boat is only 8 months old. I hope not. Surely spring should be stainless steel?
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