[Amps] Dummy load. Can distilled water be used instead of oil ?

[Jim Thomson]

##  Good point Carl.  These are new globar type SP.....and they are glass 
bodied,
designed for oil or water immersion.   Mine are 1 inch od x 12 inch long...
and have a .25 inch thick wall.     Beware, the old type CX globars, made in 
the
60s  are NOT glass bodied, and are designed for air cooling only.  They use 
a
.25 inch thicker wall on them.   IF you try and immerse them in oil, they 
will
absorb the oil, and resistance  will increase.  this info came from globar
engineer a while back.

Jim  VE7RF



-----Original Message----- 
From: Carl
Sent: Sunday, August 11, 2013 11:07 AM
To: Jim Thomson ; amps at contesting.com
Subject: Re: [Amps] Dummy load. Can distilled water be used instead of oil ?

Some resistors are not made to be immersed, check specs first.

Carl
KM1H



----- Original Message ----- 
From: "Jim Thomson" <jim.thom at telus.net>
To: <amps at contesting.com>
Sent: Sunday, August 11, 2013 7:52 AM
Subject: [Amps] Dummy load. Can distilled water be used instead of oil ?


>I built a dummy load consisting of 4 x 200 ohm globars in parallel.  Each 
>resistor is 12 inchs long x 1 inch OD.
> Each resistor resides in its own 3 inch od x 12 inch long AL pipe.  All  4 
> x AL pipes are heliarc welded  together.
> The entire mess will sit in a 7 gal new paint can.    A 5 gal can + top 
> part of a 2nd can were brazed together.
> A 7-16 DIN was installed dead center in the top lid....along with a 
> pressure relief tube, off to one side.
> Instead  of xfmr oil,  can distilled  water be used instead ??    It will 
> only be used on 160-10m..and maybe 6m.
>
> If something goes terribly wrong, Id rather have water all over the 
> basement floor  vs oil.   Distilled water is
> an insulator.   Heck, Bird + CD have water loads that use tap water.  AG6K 
> depicts a hb water load...with a
> single 500W resistor inside some pvc tube and a garden hose fitting on one 
> end....and  coax connector on the
> other end.
>
> I realize water boils at 212 F.   Has anybody tried distilled water in a 1 
> gal dummy load ?  Is it still 50 ohms ?
>
> Jim   VE7RF
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