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frequency to read RH
05-31-2013, 12:40 PM,
#16
RE: frequency to read RH
The margin of error is a technicality, a necessary evil, a manufacturer's fudge factor.

Nothing is perfect. Everything has some variation. Probes are the same way.

Manufacturers are using the same equipment you are. Of course they have fudge factors built into their warranties also. They may require 75% Rh readings knowing full well they have never seen a failure happen at levels below 80%.

In fact you see the industry changing now, as competition drives manufacturers to loosen the restrictions a bit. Concrete stops hydrating below ~85% RH, and is relatively stable. Most manufacturers are bumping their threshold from 75% to 80%, and they probably know 85% is safe, if it is properly measured at 85%.

Proper measurement means knowing the exact thickness where you are testing and placing the probe at 40% of that thickness. It means having the ambient conditions the same as they will be when in service. And it means testing with calibrated and NIST certified equipment.

So yes there's some fudge built into every side of the equation.

But if there is a failure and an investigation, and your readings were on the border and the new readings come in at 2% or 3% higher, all these fudge factors will be considered.

If you are the person making the go / no-go decision you should figure this in. If you are testing for the decision maker, you should explain your equipment's tolerances.

With Wagner equipment I don't have any qualms. With the RH testing equipment we had before Wagner.... I lost a lot of sleep at night. Confused
JD Grafton
Concrete Answers for Flooring Problems
[email protected]
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Messages In This Thread
frequency to read RH - eaadams - 05-02-2013, 10:14 AM
RE: frequency to read RH - CCR - 05-03-2013, 07:12 AM
RE: frequency to read RH - eaadams - 05-03-2013, 08:42 AM
RE: frequency to read RH - Rubensgt40 - 05-06-2013, 07:32 PM
RE: frequency to read RH - jim decker - 05-07-2013, 06:33 PM
RE: frequency to read RH - eaadams - 05-07-2013, 06:36 PM
RE: frequency to read RH - jim decker - 05-07-2013, 06:50 PM
RE: frequency to read RH - eaadams - 05-07-2013, 07:19 PM
RE: frequency to read RH - CCR - 05-09-2013, 04:25 AM
RE: frequency to read RH - CC Solutions - 05-10-2013, 10:06 AM
RE: frequency to read RH - eaadams - 05-26-2013, 10:38 AM
RE: frequency to read RH - CC Solutions - 05-27-2013, 09:48 AM
RE: frequency to read RH - Erica - 05-31-2013, 09:49 AM
RE: frequency to read RH - eaadams - 05-31-2013, 10:00 AM
RE: frequency to read RH - Erica - 05-31-2013, 10:03 AM
RE: frequency to read RH - CC Solutions - 05-31-2013, 12:40 PM
RE: frequency to read RH - CCR - 05-31-2013, 02:00 PM
RE: frequency to read RH - CC Solutions - 05-31-2013, 02:23 PM
RE: frequency to read RH - eaadams - 05-31-2013, 02:26 PM
RE: frequency to read RH - CC Solutions - 05-31-2013, 02:41 PM