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Hygrometer (in-situ) relative humidity probe testing.(Resilient Installation Corner)
Why should we use the RH Probe test method over other methods of moisture testing? The concrete slab at the time of the pour is at 100 percent moisture content (red line). Once the slab begins to dry, it dries from the top to the bottom (yellow line), leaving the surface of the concrete much drier than the bottom. This is why the methods of surface moisture testing measurement are questionable. Once a flooring material is installed and the room environment stabilized the slab goes into equilibrium (green line). Note how the Relative Humidity probe's moisture measurement is at the apex of the drying curve where it intersects with the equilibrium line.
[ILLUSTRATION OMITTED]
How to conduct a RH probe test
Test equipment available (Photo 1)
As illustrated, there are a wide variety of RH probe kits available on the market. These meters start at about $1,000 and consist of a digital meter with a cylindrical probe to measure slab temperature and internal slab relative humidity. The probes should have NIST-traceable calibration certificate stating the range of calibration and accuracy. These probes need to be cleaned and recalibrated on an annual basis to insure accuracy.
[ILLUSTRATIONS OMITTED]
Multiple-use (disposable) RH Testing equipment (Photo 2)
- What is relative humidity relative to anyway?
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...present in the air, the term relative humidity is frequently not understood...order to grasp the concept of relative humidity, it helps to ask the question, "Relative to what?" Relative humidity is defined as "a ratio, expressed...
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- Magazine article from: EDN Europe Tiwari, Shyam October 1, 2002 700+ words
...CIRCUIT IN Figure 1 is a triple, relative-humidity sensor and radio transmitter. Sensors...10 and 5 kHz, respectively, at relative humidity of 50%. The gated oscillators use...s natural frequency is 1 kHz at relative humidity of 50%. As the HS1101's capacitance...
- Transmitter senses triple relative-humidity figures. (design ideas).
- Magazine article from: EDN Tiwari, Shyam September 26, 2002 700+ words
...CIRCUIT IN Figure 1 is a triple, relative-humidity sensor and radio transmitter. Sensors...10 and 5 kHz, respectively, at relative humidity of 50%. The gated oscillators use...s natural frequency is 1 kHz at relative humidity of 50%. As the HS1101's capacitance...
- Proper relative humidity.
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- Magazine article from: USA Today (Magazine) October 1, 1997 700+ words
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- Dewpoint temperature or relative humidity?
- Magazine article from: Control and Instrumentation Hooper, Graham October 1, 1991 700+ words
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- The next generation in relative humidity testing for concrete in...
- Magazine article from: Floor Covering Installer Padgett, Denise November 1, 2005 700+ words
...RH[TM] is a fast, accurate, relative humidity probe that significantly decreases...crystal display gives you an accurate relative humidity and temperature reading. Rapid RH...installation * Digital display for relative humidity and temperature * Readings at...
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- Magazine article from: Product News Network December 11, 2007 700+ words
...generation Vaisala HUMICAP[R] relative humidity sensor, the Vaisala HUMICAP[R...the recommended Vaisala sensor for relative humidity measurement. The new Vaisala HUMICAP...improved long-term stability for the relative humidity measurement. For further information...
- Simple circuit uses optical fiber to send relative-humidity data. (Innovative...
- Magazine article from: Electronic Design Tiwari, Shyam Sunder April 1, 2002 700+ words
...180 to 220 pF for relative humidity in the range of 0...humidity is controlled. Relative humidity is computed by measuring...optical fiber via a photo diode. There's...capacitor value at 0% relative humidity. This must be subtracted...
- Veriteq's New Relative Humidity Instrument Adds Critical Capability.
- Press release article from: Business Wire November 29, 2005 700+ words
...established family of temperature and relative humidity data loggers. The 2000 High-Stability Relative Humidity (RH) data logger is especially...s challenging to obtain stable relative humidity readings over long periods of time...
Source: HighBeam Research, Hygrometer (in-situ) relative humidity probe testing.(Resilient...