[balloon-makers] Remote Temp Gauge
Blunist_2004 at ballooningmail.com
Mon Feb 11 19:53:58 CST 2002
Hey Keith. Hows your 42k comming along? Give us an update.
--- 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
>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.
>>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
>>Has anyone else tested this unit? I would be interested in hearing your
>>experiences and thoughts.
>Keith Sproul Ham Radio WU2Z
>ksproul at vger.rutgers.edu 732 821-4828
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