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Peter_1
21-02-2010, 12:55 PM
In pdf you will find pressure/temperature scale of water and besides of this table, 3 pictures of the Testo560, 2 in Pa and 1 in Microns.

You will see that the figures on the screen of the Testo 560 doesn't match with those in the Coolpack table.

How it comes? I can't find what's wrong.
NoNickName
21-02-2010, 03:11 PM
I think you are confusing the vapour pressure with the saturated evaporating pressure.
The triple point of water is 0°C, so vapor equlibrium only exists above 0°C.
Peter_1
21-02-2010, 03:51 PM
The Testo is in vacuum mode and you can see in the right corner H2O
NoNickName
22-02-2010, 11:31 AM
Resolution of instrument is 80microns and accuracy is +/-0.5% of scale. I don't think it can do any better than that. Try zeroing the instrument.
Gerrit
22-02-2010, 02:56 PM
Resolution of instrument is....

I think that accuracy (or resolution) has nothing to do to it.
The conversion from pressure to temperature goes wrong.
One of the two is at least wrong, but who (Testo or Coolpack?)
CoolPack is freeware and you can find it on google
NoNickName
22-02-2010, 04:25 PM
Coolpack can't be wrong. It's a mathematical software. I cross confirmed the output values with another software.
Peter_1
22-02-2010, 04:37 PM
NoNickname, Gerrit has a point I think, even with the given inaccuracy, the conversion between pressure and temperature must match anyhow because the Testo measures pressure and then converts it via the software to a temperature.
figaro
30-09-2011, 03:29 AM
I bet it has to do with the sea level adjustment in the testo. Its adjustable to where you reside.
Peter_1
30-09-2011, 06:14 AM
It starts from zero and the adjustment was done. Still not solved.
Peter_1
30-09-2011, 06:16 AM
N...the conversion between pressure and temperature must match anyhow because the Testo measures pressure and then converts it via the software to a temperature.
I meant, the Testo is converting its pressure to a saturated evaporating temperature because that's table the Testo uses, the saturated one.
Gerrit
30-09-2011, 07:41 AM
Hey Peter_1, and Figaro

This is my Testo560, and he is set to sea level
Until now no reply received from Testo

Still in limbo :confused:
I meet them soon on exhibitions;)