BTW, I don't think the covering would change the temperature reading at all,
as long as the entire thing had time to come to equilibrium. There is a
little issue if the far end of the probe is at a different temperature,
though. In that case you would want the probe tube to be a poor heat
conductor, I guess.
On Fri, Nov 7, 2008 at 12:22, Mike Zimmerman <[EMAIL PROTECTED]> wrote:
> Doug,
>
> Copper tube would be unsatisfactory for this project because they will be
> used in fishtanks.
> The copper can leech killing invertebrates in the tank. I was thinking an
> RTV silicone or some
> type of epoxy. I would assume each covering would change the temperature
> readings and would
> have to be calibrated for.
>
> Mike
>
>
> ----- Original Message -----
> From: "Doug Collinge" <[EMAIL PROTECTED]>
> To: [email protected]
> Sent: Friday, November 7, 2008 3:20:14 PM (GMT-0500) Auto-Detected
> Subject: Re: [Owfs-developers] DS18S20 to get water temperature
>
> I built several probes for measuring the temperature of hot water. They
> are made of copper refrigeration tube, closed at one end by sawing a cross
> in it, folding over, and soldering. I wired up a sensor to some telephone
> cable and stuck it into the tube with some heat sink gunk, then closed the
> whole thing with some special heatshrink tubing that has an internal layer
> that melts to make a great seal. Very successful probes but a fairly high
> thermal mass. The copper tube goes into a fitting made out of a compression
> union cut in half with the brass compression ring replaced with an o-ring.
> Works very well - couldn't be better, in fact.
>
> I made some cold water probes just by putting the same heatshrink right
> over the wire and sensor, leaving the sensor package sticking out a bit.
> Also very successful and much less thermal mass.
>
> On Fri, Nov 7, 2008 at 11:56, Donald J. Organ IV <[EMAIL PROTECTED]>wrote:
>
>> Has anyone created a water temperature probe using the DS18S20?? I am
>> assuming in order to do this I will need to encase it in some type of epoxy
>> that will not effect the temperature readings.
>>
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