I recently purchased a 1975 28' Marinette that has a galvanic meter installed on the dashboard.
Asking what the reading should be to be considered in a safe zone? Trying to find out specifically when I need to replace the anodes.
Thank you
What should the Galvanic meter readings range between?
Re: What should the Galvanic meter readings range between?
Your meter should tell the acceptable ranges. Look at the fine print for aluminum.
Table 1. Galvanic Series Of Metals In Sea Water With Reference To Silver/Silver Chloride Reference Cell [Sea water flowing at 8 to 13 ft./sec. temperature range 50 degree F (10 degree C) to 80 degree F (26.7 degree C)]
Anodic or Least Noble Corrosion Potential Range in Millivolts
*The range shown does not include sacrificial aluminum anodes. Aluminum alloy sacrificial anodes are available that have a maximum corrosion potential of -1100 mV.
Magnesium and Magnesium Alloys -1600 to -1630
Zinc -980 to -1030
Aluminum Alloys -760 to -1000
Cadmium -700 to -730
Mild Steel -600 to -710
bill
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Former owner of
ALUMINATION
Grosse Ile MI
Located on LakeErie
37' F/B Sedan
1975
Twin 360 Chrysler Marine
Raw water cooled
Hydraulic steering both helms
USCG Master Lic. Retired[/color]
Third Owner bill
ALUMINATION
Grosse Ile MI
Located on LakeErie
37' F/B Sedan
1975
Twin 360 Chrysler Marine
Raw water cooled
Hydraulic steering both helms
USCG Master Lic. Retired[/color]
Third Owner bill
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Re: What should the Galvanic meter readings range between?
Ideal range:
.95-1.05
numbers will vary depending on water clarity and wether fresh or salt water.
safe boating,
Dave
.95-1.05
numbers will vary depending on water clarity and wether fresh or salt water.
safe boating,
Dave
1987 Marinette 29 FB Sedan
Retired Boat Accident UL and USCG trained investigator
Retired USCG Captain
Retired Boat Accident UL and USCG trained investigator
Retired USCG Captain
- shade2u2
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Re: What should the Galvanic meter readings range between?
Mine reads .85 - .92 most of the time now. How much of a concern is this?
I added a cabled anode but it doesn't seem to change the readings. I may not have a good connection with the clip.
I added a cabled anode but it doesn't seem to change the readings. I may not have a good connection with the clip.
John
1986 39 Sedan w/Crusader 454 & 1.92 drive.
former - '84 28 Express Hardtop w/single 360 1.5:1 drive (SOLD - now in Uruguay)
Ohio and Muskingum Rivers (Marietta, OH)
1986 39 Sedan w/Crusader 454 & 1.92 drive.
former - '84 28 Express Hardtop w/single 360 1.5:1 drive (SOLD - now in Uruguay)
Ohio and Muskingum Rivers (Marietta, OH)
Re: What should the Galvanic meter readings range between?
If you haven't done so already, clean the wire connections on the meter and see if that makes a difference. It may since the current amounts are so small to begin with. Meanwhile, imho, your readings seem pretty close to the listed rangeshade2u2 wrote:Mine reads .85 - .92 most of the time now. How much of a concern is this? I added a cabled anode but it doesn't seem to change the readings.
-joel-
former owner 1988 '32 FB Sedan
Chesapeake Bay
twin 318 / 240 hp
Potomac MD
former owner 1988 '32 FB Sedan
Chesapeake Bay
twin 318 / 240 hp
Potomac MD