Operation Manual for ZBL-R620/R630 Rebar Locator
Table 1.3: Measuring Range of Rebar Diameter (
φ
6 mm ~
φ
32 mm)
Rebar Diameter
Minimum Thickness of Concrete
Cover
Maximum Thickness of
Concrete Cover
6
8
60
8
12
62
10
12
66
12
14
68
14
14
68
16
16
72
18
16
72
20
18
74
22
18
74
25
20
76
28
22
76
32
22
80
Table 1.4: Measurement Accuracy (Bar Diameter) Unit: mm
Bar Diameter
6
8
10
12
14
16
18
20
22
25
28
32
Accuracy
+2
±
2
±
2
±
2
±
2
±
2
±
2
±
2
+3
-2
±
3
+4
-3
-4
Appendix A: General Principles of Rebar Testing
Scan surface should be smooth and flat. If the surface is too rough to clean, put a
thin board on the scan surface, after completing the scan the board’s thickness
must be subtracted from the scan results.
Move the transducer in a unidirectional, uniform motion during the scan process.
Direction of scan should be perpendicular to the direction of the rebar (fig. A.2),
otherwise this may cause misjudge (Fig. A.1)
For mesh rebar, locate the rebar of upper layer first then detect the central line of
two upper layer rebars. This central line may then be used to locate the lower
layer rebar.
Fig. A.1
Fig. A.2
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