23
Figure 20: Estimated Diameter is Displayed
Rebar Sizing Guidelines
1. Sizing is done in Deep Mode only, and to a maximum depth of 4.5
inches (~114mm).
2. If the Rebar is too close to the surface (< 2.5 inches), use the 1_5/8”
plastic spacer block (or some wood) to raise the sensor off the surface.
(Rebar Size is best determined when the cover is between 2.5 - 4.5
inches.)
3. Sizing is also best determined when the rebar is isolated - no metal
objects are near the sensor - including the main unit. This may require the
user to move the main unit away from the sensor when testing for rebar
size.
4. Sizing can be done when the rebar “on-center” spacing is equal to, or
greater than 6 inches (~150mm) from any adjacent rebar, conduit pipe,
copper pipe, post tension cable and wire mesh.
5. Sizing accuracy is +/- 1 Bar size for Imperial rebar, and ~ 3mm for
Metric rebar sizes. This variance is due to the physical appearance of
rebar, which has ribs (or ridges) along the length of the reinforcement
bars. It is also due to the program settings of the unit itself. (Imperial
sizes: 3, 4, 5, 6, 7, 9 & 11. Metric sizes: 6, 10, 13, 16, 19, 22, 25, 29, 32,
35, 38, 41 & 51mm.)
6. Due to the high concentration (and/or close proximity) of rebar within a
Column, sizing (and location) is nearly impossible for a Column. It
is
not
recommended to use the rebar locator for testing Columns.
