Hilti PS 250 Manual De Instrucciones página 11

Item no.
2044438, 2044470, 2044476,
2044478, 377651
2044471, 2044479, 408056
en
2078650, 2078660, 2078670
2078651, 2078661, 2078671
4.3 Detection range, measurement range and accuracy
NOTE
If one or more of the specified conditions are not fulfilled, accuracy and precision may be compromised. The ratio of
bar spacing to depth of cover (s:c) is often a limiting factor in resolving individual bars.
This is defined as:
c
Depth of cover
s
Spacing
X Surface
In order to be able to resolve and locate individual bars, the ratio of bar spacing (s) to depth of cover (c) must be at
least 2:1. Minimum bar spacing is 36 mm (1.4"). The higher of the two values applies when resolving individual bars. A
depth of at least c≧10 mm (0.4") is required in order to carry out a depth measurement.
NOTE
Place a sheet of non-metallic material (e.g cardboard, wood, polystyrene foam,...) between the scanner and the surface
to be scanned if the minimum depth cannot be adhered to.
The starting point and finishing point of the scan (e.g. from the edge of the reference grid) must be at least 30 mm
(1.2") away from the nearest reinforcing bar.
In the annex of these operating instructions you will find bar diameter tables in accordance with:
DIN 488
ASTM
CAN
JIS
GB 500110-2002
GOST 5781-82
BIS 1786:1985
Explanation of the bar diameter tables in the annex
∅ [mm] Bar diameter in mm
∅ Bar diameter
↧ [in] Depth in inches
↧ [mm] Depth in mm
0 Bar is visible at this depth but no depth is calculated.
X Bar cannot be detected at this depth.
8
Standard
JIS G 3112
GB 50010-2002
GOST 5781-82
BIS 1786:1985
Origin / applicability of the stan-
dard
Japan, Korea
China
Russia
India