[TheForge] HF IR thermometer <$20!

[Dave Mudge]

Gollie guys, it's a $30 tool. How accurate do you expect it to be?
And for blacksmiths and welders, it's perfect........ (and affordable)
dave m

On Sun, Dec 7, 2014 at 8:31 PM, David E. Smucker <davesmucker at hotmail.com>
wrote:

> Jim is so right on the IR thermometers.  In my old day job, before
> retirement I was part of efforts in Alcoa (Aluminum Co. of America) for not
> contacting temperature measurement.  You can't pick a worst material for
> this that "shinny" aluminum.  We spent millions of dollars both with
> in-house research and working with suppliers to develop IR temperature
> measurement.  We had very good computer models for hot rolling and it was
> an
> important part of automatic control systems but to work right we need very
> good temperature measurement.  We work with multi-wavelength units and
> still
> could not get the results we needed.  Close but not good enough for the
> required input to the control systems.  Part of the problem was also having
> it work in the not so nice environment of a hot rolling mill.  At the end
> of
> the day we when back to the good old contact measurement of a two point.
> The problem with this was of course that you couldn't use contact
> measurement on a moving slab.
>
> Dave
>
> -----Original Message-----
> From: TheForge [mailto:theforge-bounces at mailman.qth.net] On Behalf Of
> James
> Binnion
> Sent: Sunday, December 07, 2014 5:52 PM
> To: Blacksmithing List Sponsored by ABANA
> Subject: Re: [TheForge] HF IR thermometer <$20!
>
>
> On Dec 7, 2014, at 5:40 AM, Bruce . <freemab222 at gmail.com> wrote:
>
> > As to Jim's comments on accuracy -- that's the thing:  I'm
> > distinguishing "hot" from "rather hot" from "very hot"
>
> That is a reasonable use, the problem with these things is one of
> perception
> "it has a digital read out it must be accurate" These things have been
> flooding the market in recent years as some kind of super accurate means of
> determining temperature but little if nothing is said by the vendors about
> how these things need proper calibration against the desired surface to get
> accurate readings.
>
> James Binnion
> jbin at well.com
>
>
>
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