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Rapid RH 4.0
- What Is Relative Humidity In Concrete?
- What Are Acceptable Levels Of Relative Humidity?
- Does Wagner Meters Sell An Easy Reader That Displays Degrees Celsius?
- We Had Some Water Spill Into One Of Our Smart Sensors - Is It Ruined?
- My Easy Reader Screen Is Frozen Or Doesn't Come On. What Do I Do?
- My Easy Reader Came With Plastic Protective End Caps - Do I Need To Keep Them?
- My Orange Cap Was Missing When I Went To Take A Reading. Do I Need To Have The Cap On To Insure Equilibration?
- How Can I Learn More About Concrete Drying And Measuring Moisture In Concrete?
Rapid RH 4.0
| Q: What Is Relative Humidity In Concrete? |
| A: Relative Humidity is the actual amount of moisture in the air compared to the amount of moisture that the air could hold if saturated, expressed as percent. In concrete, you measure the relative humidity of a small volume of air at the bottom of a hole drilled into the concrete. |
| Q: What Are Acceptable Levels Of Relative Humidity? |
| A: The type of flooring product to be installed determines the acceptable level of relative humidity. Different RH specifications apply to different materials such as resilient flooring, wood, or epoxy coatings. Check with the floor-covering manufacturer for a relative humidity specification. Many flooring manufacturers and industry associations recognize and specify relative humidity testing. ASTM F710 gives general industry guidelines. Typical relative humidity requirements range from 75% to 90% RH, depending on the flooring product. |
| Q: Does Wagner Meters Sell An Easy Reader That Displays Degrees Celsius? |
A: Yes. Easy Readers that display temperature in Celsius can be distinguished by blue labels and blue plastic protective end caps.
Call 1.800.634.9961 for more information |
| Q: We Had Some Water Spill Into One Of Our Smart Sensors - Is It Ruined? |
| A: It is very likely that the Sensor will continue to function properly after water is removed from inside the Smart Sensor housing, for example, by vacuuming. However, if water ran down into the drilled hole around the Smart Sensor housing, then the concrete in that area may be damp; drill a new hole and install a new Smart Sensor to assure accurate and useful results. |
| Q: My Easy Reader Screen Is Frozen Or Doesn't Come On. What Do I Do? |
| A: Reset the Easy Reader by pushing the recessed white reset button, located near the base of the Easy Reader, using the tip of a pen or pencil. |
| Q: My Easy Reader Came With Plastic Protective End Caps - Do I Need To Keep Them? |
| A: It is a good idea to protect the ends of the Easy Reader with the protective end caps to ensure that if dropped, damage will not occur to either end of the Reader. |
| Q: My Orange Cap Was Missing When I Went To Take A Reading. Do I Need To Have The Cap On To Insure Equilibration? |
| A: No. Each Smart Sensor isolates the measuring environment from the outside air using a 2-stage redundancy isolation ring system. As the Smart Sensor is “seated” within the hole, the first stage is a vertical ring on the lowest portion of the Smart Sensor that seals the bottom angle of the drilled hole. At right angles to that, the second stage ring seals off the sidewall of the concrete hole just above the first stage. Equilibration is assured. However, always replace a missing cap to protect the Smart Sensor and minimize debris from getting into the housing when installed on a jobsite. |
| Q: How Can I Learn More About Concrete Drying And Measuring Moisture In Concrete? |
A: The following are excellent resources:
Books and articles by Howard Kanare, Senior Principal Scientist, CTLGroup:
Concrete Floors and Moisture 2nd edition, Portland Cement Association, 164 pp, 2008.www.cement.org
“Slabs on Grade: Concrete Floor Moisture Tests,” Concrete Construction Magazine, Sept. 2007. www.concreteconstruction.net
“Why Are We Still Having Problems with Concrete Floors and Moisture?” Concrete Construction Magazine, 2007 Special Floors Issue, December 2007.www.concreteconstruction.net
Other Publications
“302.2R-06: Guide for Concrete Slabs that Receive Moisture-Sensitive Flooring Materials”, Reported by ACI Committee 302, American Concrete Institute www.concrete.org
“Moisture Testing of Concrete Slabs”, written by Peter Craig and George Donnelly, Sept. 2006 issue of Concrete International, Vol 28, No. 9. www.concrete.org
“Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes”, Designation: F2170-02, ASTM International. www.astm.org
“Concrete Moisture Meters and Calcium Chloride Test: There are Better Ways to Test Concrete for Moisture,” written by Christopher Capobianco, Oct. 2007 issue of Floor Covering Installer Magazine. www.fcimag.com |
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