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OhmCorr Meter™
Resistivity
meter to assess corrosion currents in concrete.
Assesses damaging corrosion currents in
concrete.
Economic and easy to use.
Direct digital readout of resistivity. Measuring from two small
holes avoids the problems and errors of surface measurements.
Used in conjunction with CorMap™ System to produce
resistivity plots.
Assesses Concrete Resistivity.
OhmCorr™ has two probes spaced 1.97" (5cm)
apart which are placed in holes drilled to a depth of 3/8th" (8mm) and
filled with conductive gel. The direct digital read-out of resistivity
is displayed on the LCD when the control switch is activated. OhmCorr™ and CorMap™, when used together, provide an
economical and sound diagnostic system of corrosion in reinforced
concrete.
The electrical conductivity of concrete
is an electrolytic process that takes place by the movement of ions in
the cement matrix. This ionic movement will occur when contaminants such
as chloride ions or carbon dioxide are introduced into the cement
mortar matrix.
A highly permeable concrete will have a high conductivity and
low electrical resistance. Because resistivity is proportional to
current flow, the measurement of the electrical resistance of concrete
provides a measure of the possible rate of corrosion. Since carbonation
seriously affects surface resistance, measurement on the concrete
surface should be avoided.
The James resistivity meter, OhmCorr™, has two
probes spaced 5cm (1.97 inches) apart which are placed in two holes
drilled to a depth of 8mm (3/8 inch) and filled with conductive gel. The
concrete resistivity is displayed on an LCD when the control switch is
activated.
The following table correlates a range of values vs. the
possible rate of corrosion of the reinforcement bars.
RESISTIVITY LEVEL (K
OHMS CM) | POSSIBLE
CORROSION RATE OF
REINFORCEMENT
REBARS
Very
High
High
Moderate
to Low
Insignificant
|
The James OhmCorr™, when used
in conjunction with the James CorMap™ System
provides an economic and sound means of diagnoses of corrosion in
reinforced concrete.
Weight
complete in carrying case
| 8 lbs (4
kilos) |
Display: | 4-1/2” Digit in LCD |
Resolution: | ± 0.1K
ohms cm (± 1 Digit) |
Range: | 0.5 - 20K ohms cm |
Battery: | 9 Volt |
