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frequency to read RH

#18
I understand your position CCR, but you must consider the parameters of the ASTM.

Using Wagner probes it's pretty simple. Each probe is NIST certified. There is no required calibration. No leap-frogging probes. No tubes to open and close.

However the ASTM governs a process, not a manufacturer or specific probe. I am speaking a bit more broadly, not concentrating solely on Wagner probes in case that is not what the tester is using.

Some probes may be off a considerable amount when calibration is checked, then also be prone to additional error inherent in the probe. These variables must be noted on the final report.

It would be possible to use another RH testing manufacturer's probe and see a displayed reading of 78%RH, but actually have the true RH of the slab at 82%RH accounting for the allowable probe calibration deviation and the acceptable probe reading variation.

If the go / no-go decision is at 75% and the GC is thinking a 78% reading with a 2% error means the slab is really at 76%... Well you may know better.

Especially if the slab is not at service conditions. Wink

This is all to cover your butt. I see no harm in stating the readings can vary by a small percentage and letting the decision makers take the risk.

It is for that very reason that I explain the depth of my probes is based on the design thickness of the slab, and for more precise readings I must drill at each probe location to measure the slab thickness at that location.
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

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