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Old 02-03-2015, 10:55 PM   #1
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propylene glycol

Hey Guys,

I am installing a raymarine in hull transducer. The instructions say to use 2.4 ounces of propylene glycol in the base. What the heck is propylene glycol? From my searches it seems to be an ingredient in coolant? Where can I get it?

I've also heard of using mineral oil. Thoughts?

Thanks
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Old 02-03-2015, 11:05 PM   #2
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Hey Guys,

I am installing a raymarine in hull transducer. The instructions say to use 2.4 ounces of propylene glycol in the base. What the heck is propylene glycol? From my searches it seems to be an ingredient in coolant? Where can I get it?

I've also heard of using mineral oil. Thoughts?

Thanks
Looks like you can buy it pretty inexpensively on Amazon.
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Old 02-03-2015, 11:46 PM   #3
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We used mineral oil in ours.
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Old 02-04-2015, 12:14 AM   #4
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The "safe" marine & RV antifreezes use propylene glycol & water, rather than the ethylene glycol used for standard antifreeze.

Propylene glycol is used for transducers because it has almost the same density as seawater so it minimises any error in the depth reading. Ethelene glycol is slightly heavier.
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Old 02-04-2015, 01:05 AM   #5
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I sat mine in silicone sealant as advised by Garmin. Issue was getting it level so it wasn`t firing signals at an angle. It takes longer than my thru hull transducer initially finding the bottom, once it has it`s fine. My old IG has no provision for "shoot thru the hull"transducers, I had to find a way without cutting another hole, only buying Garmin after Garmin said I could run both GPS/Sounders off one transducer,which you can`t.
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Old 02-04-2015, 01:11 AM   #6
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I've used just water. Works fine. Might have to top it up if running in rough stuff, and due to evaporation.

Pretty cheap, too. Amazon probably has it.
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Old 02-04-2015, 04:37 AM   #7
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Greetings,
Mr. Dc. IF there is no chance of the fluid freezing you can use water as evidenced by Mr. S. We used mineral oil in ours and it's readily available at any drug store. Ethylene glycol is basically RV anti-freeze, as mentioned.
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Old 02-04-2015, 07:17 AM   #8
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I've used just water. Works fine. Might have to top it up if running in rough stuff, and due to evaporation.

Pretty cheap, too. Amazon probably has it.
Isn't it amazing how you can find anything you need on the internet?

Thanks for the replies guys, I think I'll start with water, no chance of freezing down here.

Doug
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