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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