10 © 2015 Proceq SA
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[inch]
[mm]
Ø 6 mm
Ø 8 mm
Ø 16 mm
Ø 12 mm
Ø 20 mm
Ø 34 mm
Ø 40 mm
[inch]
Standard range
Large range
# 2
# 3
# 4
# 5
# 8
# 13
Real Cover
[mm]
Error of cover
Fig 7: Error values for covers measured with default diameter of 16 mm / # 5 set
3.4.4 Factors Affecting Diameter Determination
Two factors affect the determination of the rebar diameter. One is the cover depth. Diameter can be
determined for rebars with cover not exceeding 80% of the Standard range. 64 mm / 2.5”.
The second is the spacing between neighboring bars. For accurate determination of the diameter,
the spacing between the rebars must be greater than the limits shown in the drawing below with
reference to the MC (4).
S
2
S
1
S
1
>150 mm
>6
”
S
1
: 130 mm / 5.2” without Neighboring rebar correction
50 mm / 2.0” with Neighboring rebar correction (see 5.4.2)
S
2
: min. 150 mm / 6”
depending on the rebar diameter
Fig 8: Minimum rebar spacing for correct readings
# 6
# 11
Ø 26 mm
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