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Re: Understanding the CAPAC

Posted: Tue Feb 18, 2020 11:52 am
by jralbert
I believe Jeff may have made one of these and posted. It was, as I recall, a very simple setup that you dropped overboard and got a quick reading on a voltmeter. It is not good, however, to use as troll bait for rockfish.

Re: Understanding the CAPAC

Posted: Tue Feb 18, 2020 12:59 pm
by barefoot99
jralbert wrote:I believe Jeff may have made one of these and posted. It was, as I recall, a very simple setup that you dropped overboard and got a quick reading on a voltmeter. It is not good, however, to use as troll bait for rockfish.



Busia, explains it again. An electric meter set on millivolts , positive lead to your grounding bar in the boat ,negative lead in the water with the reference electrode.( Extra cost ,nice to have in the toolbox) This will give you an accurate reading. It is what a CAPAC meter does as a unit, this is also how you calibrate the CAPAC meter in your boat.

Re: Understanding the CAPAC

Posted: Tue Mar 10, 2020 7:24 am
by Fastjeff
The probe I bought was not THAT expensive, as I recall. It can work with an ordinary volt meter.

Jeff

Re: Understanding the CAPAC

Posted: Tue Mar 10, 2020 2:50 pm
by Busia
BoatZincs.com has them. look under tools. This and a little digital VOM meter, which you should have for other tests, and you can test more accurately and cheaper than trying to fix the CAPAC system in the boat.


Corrosion Reference Electrode and User's Guide by ABYC-Certified Corrosion Experts
List Price: $199.99
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PRODUCT SPECS

A portable silver/silver-chloride electrode
for performing corrosion potential
surveys on yachts and boats.
Good site to go to. Read, and learn all the facts, and order more anodes.
(thanks for the eraser, we don't need spam)--Ed

Re: Understanding the CAPAC

Posted: Wed Mar 11, 2020 7:00 am
by Fastjeff
Wow! Those have really gotten expensive.

Jeff

Re: Understanding the CAPAC

Posted: Thu Apr 30, 2020 8:16 am
by barkleydave
Yes glad I bought mine 20 years ago... LOL

Re: Understanding the CAPAC

Posted: Sat Oct 03, 2020 3:53 pm
by wschneid
I have a Marinette 32 Fly Bridge Sedan 1986. The previous owner showed me the galvanic reading of about .9 in salt water. I now have the boat in fresh water and when not connected to shore power I still show .9, but when I connect to shore power it drops to .7. This is second marina I ave been in on this river and I get the same results. Could I have some grounding problem? Any ideas?

Bill Schneider

Re: Understanding the CAPAC

Posted: Wed Oct 14, 2020 10:07 am
by JohnO
Having a bit of trouble understanding this post. Is low bad or is high bad or both? I have a 28 sedan and the meter shows it should be around .9 I am reading 1.2. The water on Lake Michigan is pretty cold right now and there is a lot of water current going on now in the harbor so the water isn't as clean as it was about a month ago.

Re: Understanding the CAPAC

Posted: Wed Oct 14, 2020 11:44 am
by jralbert
I think you're ok

Re: Understanding the CAPAC

Posted: Wed Oct 14, 2020 1:18 pm
by Fastjeff
..."Is low bad or is high bad or both?"

Yes! You need to be in the range of around ,7 to 1.2 volts (times ten on the CAPAC meter scale).

Jeff