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Meter Storage:
For a long service life, it is important to store your
meter properly. Avoid excessively hot or cold locations,
and keep the meter in the case provided. Do not store
the meter in an area with excessive electro-magnetic
interference, such as near an electric motor, or where
it could be crushed, such as in front of a forklift.
To Operate:
Press and release the ON button. Take readings by
pressing the bottom of the meter to the concrete
surface. The meter will automatically shut off after
60 seconds of inactivity. The shutdown timer will
reset anytime the meter reading changes or the ON
button has been pressed.
Taking a Reading:
1.
The surface of the concrete should be brushed
clean of loose debris and dust.
2.
Turn on the meter and verify the
"Low Battery" light does not
illuminate.
3.
Place the sensor of the meter on the
area of the concrete to be tested.
Press down firmly, making sure the
sensor rests flat against the concrete.
4.
On a rough surface take a number of readings
close to one another. If the readings vary, use the
highest reading. On a normal smooth surface it is
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also recommended that you take a number of tests
close to one another and use the highest reading.
5.
Moisture readings in concrete may be affected by
the following factors:
•
The type of aggregate used in the mix may
contain iron or other metals. This could cause
the reading to be high or read the same value no
matter where you place the meter.
•
A rebar or metal screen too close to the surface
will cause a high reading. Move the meter to
several areas for more comparisons.
Interpreting the Reading:
Readings are relative and are useful for comparing
moisture levels in various locations of a concrete
slab and to determine where to place additional tests
using ASTM F2170. Place additional tests in locations
where the C575 reads the highest. It is strongly
advised that ASTM F2170 relative humidity testing
methods be used to determine if the floor is ready for
the floor covering. Do not use the C575 to determine
if the concrete slab is ready for a floor covering.
This meter is designed to provide information as to
where the wettest parts of a slab are so further testing
can be done in those areas. The meter does not measure
vapor pressure (the water that leaves during the curing
stage) in the concrete or the pounds of water per
square foot, etc. The information provided by meter
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