Rethink Your Life! Finance, health, lifestyle, environment, philosophy |
The Work of Art and The Art of Work Kiko Denzer on Art |
|
|
Cob RE: evaluating road gravel slabJohn Straube jfstraube at golden.netSun Jan 31 14:13:27 CST 1999
On Saturday, January 30, 1999 11:34 PM, Keith Breuker [SMTP:flyfisherkb at centuryinter.net] wrote: > I'm looking for three or four temperature sensors that I could bury at > Does anyone have knowledge of such things that could make a > recomendation? I don't want to spend much if it can be avoided. I would recommend a precison 10k ohm thermistor. These can be measured with a standard multimeter and sensor leads made of normal light gauge telephone wire work fine. Such thermistors can be pruchased for a couple of dollars at an electronics supply house. The tough part is to plot the curve of resistance vs temperature. If you buy expensive ones, this curve is provided. If you buy cheap ones, you make the curve by measuring the resistance at, say, 0 (in ice bath), 10 C, 20 C etc. You can decide yourself how much time vs how much money you wish to invest. Use shrinkwrap tubing around all your underground connections to avoid corrosion. ------------------------------------------------------------------- John Straube Building Envelope Engineering Building Engineering Group 165 Albert St University of Waterloo Waterloo, Ont. Waterloo, Ont. Canada N2L 3T2 Canada N2L 3G1 Phone: 519 741 7920 519 888 4567 Fax: 519 885 5193 519 888 6197 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|