25
© 2014 Proceq SA
diameter of the mesh rebar. The input depends on the bar diameter and
on the mesh width. This input value should be determined by means of a
test measurement on an open system with specific rebar mesh wire ar-
rangements. Measure on each arrangement with different covers to find
out the diameter setting at which the correct cover is indicated.
Welded reinforing mesh
a
1
[mm]
a
2
[mm]
current d
[mm]
d to be set
[mm]
100
150
100
150
5
6
8
7
Figure 27:
Examples for diameter settings at welded meshes to measure
correct cover values
NOTE! The “Standard Range” must be selected. With the
“Large Range” or “Spot Range” selected, locating of the
rebars may be completely wrong.
Diameter Measurements on welded Reinforcement Meshes
In most cases a diameter can be measured but the displayed value is far
too large and cannot be used. The only way to determine the diameter is
by an inspection hole.
Measure Rebar Diameter
In case the rebar diameter is not known, the Profometer PM-6 can accu-
rately determine the diameter of a rebar under certain conditions.
NOTE! The Determination of the rebar diameter with Profo-
meter PM-6 is limited to a maximum cover of about 63 mm
(2.50 inch).
The tutorial chapter on the pulse induction principle describes the limita-
tions of the technology and clearly outlines the conditions whereby ac-
curate readings of rebar diameter CANNOT be made if there is too much
interference from neighboring rebars or other metallic objects within the
sphere of influence.
NOTE! In any case, it is advisable to expose at least one first
layer rebar of each rebar arrangement to measure the real di-
ameter. The obtained diameter values can then be compared
and if necessary corrected with the measured real diameter.
Step 1
Locate and mark a rebar grid of the first and second layer
rebars as described under Locating Mode in “3.5 Measure-
ment Modes and Storage of Data”.
Step 2
Select one rebar that has the largest spacing from neighbor-
ing rebars.
Step 3
Use a ruler and confirm that the spacing is at least as indi-
cated in Figure 26. If not, redo Steps 1 and 2 until a rebar
is located with the required spacing to a neighboring rebar.
Step 4
Place the MC
14
or
15
of the Profometer PM-6 over the
rebar at the centerline of the rebars running crosswise to the
rebar under test and measure the diameter.
