water temperature sensor

[kostas]

Hello,

i want to build a water temperature sensor. I have seen some nice
thermometers in maxim site but i don't know if they can't stand the
shock of submerging them into distilled water or coolant fluid for
cars??? Any other ideas for underwater temperature sensors???

 

[Mark]

Thermistor
"kostas" <asdas@.assfic.fdf> wrote in message
news:cs1hv4$lm5$1@usenet.otenet.gr...

Hello,

i want to build a water temperature sensor. I have seen some nice
thermometers in maxim site but i don't know if they can't stand the
shock of submerging them into distilled water or coolant fluid for
cars??? Any other ideas for underwater temperature sensors???

 

[Anthony Fremont]

"kostas" <asdas@.assfic.fdf> wrote in message
news:cs1hv4$lm5$1@usenet.otenet.gr...

Hello,

i want to build a water temperature sensor. I have seen some nice
thermometers in maxim site but i don't know if they can't stand the
shock of submerging them into distilled water or coolant fluid for
cars??? Any other ideas for underwater temperature sensors???

You could always encase one in ordinary two-part epoxy (if you can live
with the thermal lag). As long as you don't exceed the max temp of the
device, you shouldn't have any problem. IMO, two part epoxy is a
godsend, it's right up there with WD-40 and duct tape.

 

[Mark Jones]

kostas wrote:

Hello,

i want to build a water temperature sensor. I have seen some nice
thermometers in maxim site but i don't know if they can't stand the
shock of submerging them into distilled water or coolant fluid for
cars??? Any other ideas for underwater temperature sensors???

Hi, check this out:
http://www.allelectronics.com/cgi-bin/category.cgi?&item=LM34DZ

Be sure to read the "spec sheet" (datasheet) also.

-- "The knowledge is worth 10x more than the solution." MCJ 200401

 

[ScottL]

Easiest solution I can think of is "off the shelf". Go to an auto
parts store and get a temp sending unit for something simple like a '80
Chevy 305. One terminal to ground resistance. Using iced to boiling
water figure your resistances and plot from there. You can use a piece
of PVC drilled and tapped then spliced into a heater or radiator hose
to put it into the flow.

VW, as in 80's Rabbits used a two stage temp switch that powered the
radiator fan. It would handle a good load without external relays.

-ScottL


kostas wrote:

Hello,

i want to build a water temperature sensor. I have seen some nice
thermometers in maxim site but i don't know if they can't stand the
shock of submerging them into distilled water or coolant fluid for
cars??? Any other ideas for underwater temperature sensors???

 

[Daniel A. Thomas]

"kostas" <asdas@.assfic.fdf> wrote in message
news:cs1hv4$lm5$1@usenet.otenet.gr...
| Hello,
|
| i want to build a water temperature sensor. I have seen some nice
| thermometers in maxim site but i don't know if they can't stand the
| shock of submerging them into distilled water or coolant fluid for
| cars??? Any other ideas for underwater temperature sensors???
|

This might be of interest.
http://www.raytek-northamerica.com/cat.html?cat_id=2.3.5
Dan