[chbot] High Accuracy Thermometer
manningc2 at actrix.gen.nz
Tue Jul 13 03:49:59 BST 2010
What sort of accuracy are you trying to achieve?
The water + crushed ice method should give you better than 0.5 degrees. Better
than 0.1 degrees if you use deionised water and a closed jar (to control the
For another reference use a medical thermometer (or better still an ovulation
thermometer) They're accurate and cheap.
On Tuesday 13 July 2010 12:55:22 Nathan Kennedy wrote:
> Ah, good point Charles, high accuracy is what I was meaning.
> I've compared the readings with other thermometers (aquarium thermometer,
> my baby daughter's bath water thermometer), and they all seem to be within
> a degree of each other.
> I was measuring the temperature of my wife's tropical fish tank. Both my
> probes measured 25.9, the bath thermometer measured 26.0, and the aquarium
> thermometer measured 26.7. I thought it would be good to compare with a
> known accurate thermometer to know which reading was the closest.
> Thanks again,
> -----Original Message-----
> From: chchrobotics-bounces at lists.linuxnut.co.nz
> [mailto:chchrobotics-bounces at lists.linuxnut.co.nz] On Behalf Of Charles
> Sent: Tuesday, 13 July 2010 12:33 p.m.
> To: Christchurch Robotics
> Subject: Re: [chbot] High Precision Thermometer
> High accuracy or high precision?
> A thermistor is about as precise as you'd ever need but won't be
> accurate without good references.
> Crushed ice and water give a pretty good 0deg C reference.
> On Tue, Jul 13, 2010 at 10:57 AM, Nathan Kennedy
> <nathan at kennedytechnology.com> wrote:
> > Good morning all,
> > Does anyone in the group have access to a high precision thermometer? I
> > built a couple of temperature probes and based the temperature
> > on the datasheet specifications (and the results are consistant across
> > probes), but would like to compare against a high precision thermometer.
> > Thanks,
> > Nathan.
> > http://kturl.com/blog
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