Description Of Equipment; Function - JRC NJJ-105 Handy Search User Manual

This product is indispensable for repairing/rebuilding and maintaining reinforced
concrete structures using its accurate and speedy diagnostic technology.
This product (concrete internal probe vehicle) radiates electromagnetic waves
through the surface of concrete and receives reflected signals from objects found
inside such as reinforcing steel bars, cavities, or other objects that have different
electrical characteristics from concrete. Object position and depth are then displayed
and recorded as image data.
Judge the scan result with considering the depth sensing capability of this
product. Since the depth sensing capability of this product is subject to the
conditions of the object of investigation, judging the scan result with no
consideration of the depth sensing capability may cause the accidental cutting
of rebar.

1.1 Function

Table 1-1 shows functions and performances of this product.
Table 1-1
item
No.
1 Search method
2 Search object
3 Search depth
4 Depth resolution
Horizontal
5 discrimination
resolution
1

Description of Equipment

CAUTION
Functions and Performances of this product
Electromagnetic wave radar method
Rebar (reinforcing steel bar), Polyvinyl-chloride pipe,
Cavit y, etc.
5 to 300mm for concrete having a relative dielectric
constant ＝ 6.2 and the top rebar of diameter ≧ 6mm
Approx. 1 mm at the display range setting of Shallow
Approx. 2 mm at the display range setting of Deep
≧ 75mm for the scanned object located at depth < 75mm
≧ Depth of the scanned object for the object located at
depth ≧ 75mm
※Typical performance for the reference concrete:
This product allows the user to discriminate between two
rebars located respectively at depth 75mm and 175mm and
at the interval of 40 mm.
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Functions and Performances