[Amps] SS amps watercooling - was PowerGenius XL

[Joe]

Good Point!

The Mineral oil or Transformer oil, I wonder what happens to that in 
varying amounts of contamination?

Joe WB9SBD
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On 2/21/2017 9:27 AM, Big Don wrote:
> Might run another experiment to see how conductive initially distilled
> water becomes after spraying it onto the inside of a cabinet, and on some
> circuit boards. Collect the drainage in a pan, which now contains any
> impurities picked up along the way, and check the conductivity now......
> Don  N7EF
>
> On Tue, Feb 21, 2017 at 7:22 AM, Jim Thomson <jim.thom at telus.net> wrote:
>
>> Date: Mon, 20 Feb 2017 19:05:27 -0500
>> From: "Ray, W4BYG" <w4byg at att.net>
>> To: "amps at contesting.com" <amps at contesting.com>
>> Subject: Re: [Amps] SS amps watercooling - was PowerGenius XL
>>
>> FYI:  I'm afraid I have to disagree on the statement below about
>> distilled water being conductive.
>>
>> In industrial experiments in the use of distilled water,  I found it to
>> be very non-conductive.  If I recall correctly, it has a measured
>> conductivity of 50 to maybe 100 micro-Siemens per centimeter squared.
>> That's not much.  Pure water becomes conductive only if it becomes
>> contaminated with salt like contaminates.  For a comparison, seawater
>> typically measures in the thousands of micro-Siemens per centimeter
>> squared, because of the high salt content.
>>
>> While working on a clients project to do so, I spent many hours
>> attempting to inject RF into water of various solutions.  It was very
>> difficult in the lab trying to get RF to propagate thru pure water.
>> Other more contaminated solutions not so much..
>> 73,
>> Ray, W4BYG
>>
>> ##  re-read the post. Neither roger nor I said distilled water is
>> conductive.
>> I got out 2 identical plastic caps, and filled one with new distilled
>> water,and
>> the 2nd one with tap water from the kitchen sink.   Then stuffed the fluke
>> 87a
>> probes into each one.... dried off between tests.  Distilled water reads
>> sky high
>> resistance... vs  tap water.   Thats good enough for me.  Distilled water
>> is dirt cheap
>> to buy and would make an excellent coolant for water cooled LDMOS.   Dunno
>> how often it would have to be changed out.   Even if it was every 6 months
>> to a year,
>> or even far less, who cares.  Simple procedure.
>>
>> Jim  VE7RF
>>
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