© 2015 Proceq SA 9
3.4.2 Resolution
There is a limit to the minimum spacing of bars depending on the cover depth and rebar diameter.
It is impossible to distinguish between individual bars above these limits.
1
2
3
4
5
6
1
2
3
4
5
6
7
60
80
100
120
140
0
20
40
020406080100 120 140160 180
0
[inch]
[mm]
Cover depth
Large
range
Standard
range
Ø 40 mm
Ø 26 mm
Ø 16 mm # 5
Ø 12 mm
Below the curve:
Individual rebar can be detected
Rebar spacing
[inch]
[mm]
C
S
# 12
# 13
# 8
# 4
# 3
Fig 6: Resolution
3.4.3 Effect of Setting Incorrect Bar Diameter
The accuracy of the cover measurement is also dependent on setting the correct bar diameter.
The following chart gives an estimation of the error of the cover reading for different rebar sizes if a
default size of 16 mm / #5 is set.
NOTE! In case the diameter is not known and cannot be measured the rebars should
be exposed in one area to set the correct diameter in the Profoscope. With the correct
diameter set the cover over a single rebar can be measured with the accuracy shown in
chapter 3.3.
Ø 8 mm
# 2
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