[balloon-makers] Remote Temp Gauge

Kasey Blunist_2004 at ballooningmail.com
Mon Feb 11 19:53:58 CST 2002


Hey Keith. Hows your 42k comming along? Give us an update.

Kasey

--- Keith Sproul <ksproul at vger.rutgers.edu> wrote:
>The actual temperature at the surface of the balloon is a lot less 
>than the air even 2-3" in.  This 'boundary' layer keeps the material 
>cooler than the actual temp inside the balloon.  If you mount this in 
>a pocket on the outside of the balloon, it may stay cool enough to 
>work.
>
>Also, normal batteries tend to not work at high temperatures.  The 
>FLYTEC unit specifically states to use a 9-volt LITHIUM. (Energizer 
>is recommended if I remember correctly).  This too can be a problem.
>
>Since the unit still works, I would try it again in the actual balloon.
>
>Keith Sproul
>
><snip>
>
>>
>>To simulate this, I warmed the oven up to 250 degrees and set the remote
>>unit on a cookie sheet.  The temperature immediately started to rise and
>>within five minutes, the base unit was recording 157 degrees.  But before
>>five minutes was up, the remote unit stopped sending a signal.  I didn't
>>notice this right away, but when I did, I checked the temp on the remote and
>>it was at about 188 degrees.  Then the LCD faceplate went black.  As a
>>bonus, the oven had that lovely smell of melted plastic.
>>
>>Out of the oven it came and it started to cool.  About five minutes later it
>>started sending again - at a temp of 134 degrees.
>>
>>Overall, I'm not sure it will work very well in a balloon unless you can
>>mount the sending unit outside of the envelope and ensure it stays below 150
>>degrees.
>>
>>Has anyone else tested this unit?  I would be interested in hearing your
>>experiences and thoughts.
>>
>>Good Floating!
>>
>>Greg Winker
>>-------
>
>-- 
>Keith Sproul			Ham Radio WU2Z
>ksproul at vger.rutgers.edu	732 821-4828
>-------
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