Re: [Amps] Centurion cooling improvement ideas for AM service

[Will Matney <craxd1@ezwv.com>]

Rich,
Yes on the coil, you can't get a true temperature down deep inside the 
windings but heat will be dissipated by the coil itself. It should be 
different than the core temp because of the insulating properties of the 
bobbin. This can still be a good indication that a transformer is 
running too hot. The windings are hard to measure and if one were going 
to be doing a huge run, one could be wound with temp sensors or 
thermistors embedded, and then take measurements with or without a load. 
That would be the only way I know to get any type of an accurate 
reading. One thing to mention, transformers can be wound with 
thermostats embedded in the windings to shut the equipment down if the 
temp gets too hot. They do this in electric motor windings all the time 
and I've seen it in transformers. This would save cooking the 
transformer. Actually, a thermostat could be mounted on the top of the 
core and kick out if it gets too hot too.

Will


On Aug 25, 2004, at 7:27 PM, Will Matney wrote:


> > Will miracles never cease! I never thought I would see the day a Fluke 
> > instrument would be that cheap. I figured that being a Fluke would 
> > have been $350 to $450 dollars. Thanks for the info on this Rich,
>  

ur welcome


> > I may just get one of these myself! The model 65 is only $289 and has 
> > memory with temp conversion. The 61 is really all ones needs without 
> > getting extras. That would come in handy around the house checking for 
> > heat or cooling leaks around windows and doors. I would like this for 
> > not only checking tube temperatures but the temps on transformer coils 
> > and cores.
>  

Will -- For cores, yes, but for transformers windings, no.

> > Will Matney
> >
> > R. Measures wrote:
>  
>
> > > > On Aug 25, 2004, at 2:02 PM, Will Matney wrote:
> >    
> >
> > > > > > Rob,
> > > > > > I think, but may be wrong, that Rich was referring to those hand 
> > > > > > held IR temperature meters. Some even show a negative image on a 
> > > > > > small display of what they're being pointed at with the hot spots in 
> > > > > > red or yellow and the cold in blue. The colors denote the 
> > > > > > temperatures in celsius.
> > > > > >
> > > > > > Will Matney
> > > > > >
> > > > > > I did not even know about these.  How much are they?
> > >      
> > >
> > > > The Fluke Model 61 is $109.  It shines a laser beam where it is 
> > > > measuring the temp.
> > > > http://www.newark.com/product-details/text/CD121/49571.html
> >    
> >
> > > > > >  If they are
> > > > > > designed to connect by wire to a sensor that can be placed in the
> > > > > > rf deck area it might be worth it to have one dedicated to monitoring
> > > > > > the temp.
> > > > > >
> > > > > > Rob/K5UJ
> > > > > >
> > > > > >
> > > > > > From: R. Measures <r@somis.org>
> > > > > > To: Ed Briggs <edbriggs@optonline.net>
> > > > > > CC: "Rob Atkinson, K5UJ" <k5uj@hotmail.com>, amps@contesting.com
> > > > > > Subject: Re: [Amps] Centurion cooling improvement ideas for AM 
> > > > > > service
> > > > > > Date: Wed, 25 Aug 2004 07:01:07 -0700
> > > > > >
> > > > > > -  In the 21st century, the best way to determine if seal cooling is 
> > > > > > adequate is with an IR digital thermometer.  If I spring for one, it 
> > > > > > will be a Fluke.  With a name like that, it has to be pretty well 
> > > > > > engineered.
> > > > > >
> > > > > >
> > > > > > _______________________________________________
> > > > > > Amps mailing list
> > > > > > Amps@contesting.com
> > > > > > http://lists.contesting.com/mailman/listinfo/amps
> > >      
> > >
> > > > Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
> > > >
> > > >
> > > > __________ NOD32 1.817 (20040719) Information __________
> > > >
> > > > This message was checked by NOD32 antivirus system.
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> >    
>  
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org


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