T R
he Rapid RH® moisture testing system
should be used on any project where
moisture-sensitive floor coverings or coatings
are to be applied over concrete slabs. Owners,
general contractors, flooring contractors/
installers and testing companies need to be
sure the tests they perform are accurate,
repeatable and available to all who need
to know the current moisture condition of concrete
slabs.
apid RH
®
significantly improves your
project team’s ability to instantly test and/
or monitor the drying progress of a concrete
slab without adding substantial cost to the
project. The Rapid RH® enables you to take
fast, accurate periodic readings that fully
comply with industry standards. The Rapid
RH® Smart Sensors are factory-calibrated
and use CMOSens® technology to ensure the
sensor’s accuracy and fast equilibration.
2
®
E
X
Step 1: Drill the Hole Step 2: Clean the Hole
Correct hole depth and hole diameter are important in complying with the ASTM F2170
standard (see ASTM F2170 Best Practices on page 11). For easy installation of a Smart
Sensor, a uniformly round hole is also important. Drill a hole in the concrete slab to the
required depth using a rotary hammer drill and a ¾”-diameter masonry drill bit. Per the
ASTM F2170 standard, drill the hole to a depth equaling 40% of the slab’s thickness for
slabs that are drying from one side, or 20% depth for a slab drying from two sides. For
proper Rapid RH
®
4.0 EX installation, be sure to position the drill perpendicular (90˚) to
the surface being tested.
TIP: If you do not have a depth gauge for your drill, mark or tape-off your drill bit to the
correct depth setting.
Attach the vacuum attachment to the straight extension of a shop vacuum cleaner
hose* and thoroughly vacuum up the dust in and around the hole.
Next, insert the wire bristle brush into the hole. Turn the brush several times to
loosen pulverized concrete from the walls of the hole. Vacuum again. Repeat this
step twice to ensure no loose concrete particles remain in the hole.
IMPORTANT: Correct Diameter and Hole Uniformity: Use the ¾”-diameter section
of the black insertion tool as a diameter and uniformity gauge to ensure a correct
and uniformly round hole. If the ¾”-diameter section of the tool will not go easily into
the hole, the drill bit may be out-of-spec (worn out, etc.) or the hole may not have a
uniform diameter from top to bottom. Not performing this step may cause damage to
a Smart Sensor when attempting insertion.
*The vacuum attachment may require an adapter depending on vacuum model.
Brush Clean
Vacuum
3
Drill
4
3/4” Diameter Section
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