Re: Solar water heater temp sensors? Buy where?

 
If you are designing the circuit there's nothing cheaper than diodes:
http://www.micro-examples.com/public/microex-navig/doc/098-temperature-sens=
or.html

Tape them to the pipe under the insulation. The TO-220 package makes
better thermal contact.

Transistor base-emitter junctions work fine too.

jsw

  Thermocouple (produces micro-volts) - Google: Type K Chromel / Alumel
Thermistors (produces resistance) - Google:5K NTC & 10K NTC
Calibrated Sensors - Google: LM34 for (F) or LM35 for (C)

http://www.jc-solarhomes.com/making_temperature_probes.htm

Good luck,

Curbie

On Thu, 16 Dec 2010 06:57:22 -0800, "Bill"

 

There is no reason to use them;


These work well and are dirt cheap. I made small forms out of paper and clay to
put them on the pipe, and poured on epoxy.


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Good choice. They are rated to a higher temperature than I expected,
in case the fluid circulation fails.
http://www.national.com/ds/LM/LM35.pdf

jsw

 
Can you suggest an appropriate one? Asking the counter clerk to help
engineer a project isn't always very productive. ¿Alguien habla
Inglés?

jsw