Hilti PS200 Ferroscan, Operating Instruction, Page: 67 / 315

65
en
the atmosphere is dust-free as far as possible and that
the infrared windows on both scanner and monitor are
clean and relatively free from scratches. Excessively
scratched windows must be replaced by Hilti Service.
During data transfer, try to hold the monitor and scan-
ner correctly aligned for the entire period that data is
being transmitted.
This symbol may appear while transferring data from
the scanner to the monitor. Remedy the problem by
switching the units off and on again and check their align-
ment with each other. If the error message reappears,
the appliance will need to be sent to Hilti for repair.
In the event that data transfer is interrupted, data can-
not be lost. Data is deleted from the scanner only once
all scans have been successfully transferred and the
Confirm button on the scanner has been pressed.
7.5 Tips for scanning and evaluation
Object too narrow to scan or reinforcement is too close
to an exterior corner to be scanned properly.
Use a thin overlay board that extends beyond the edge(s)
of the structure and scan on the board beyond the edge.
Note that the thickness of the board must be deducted
from any depth measurements. The thickness of the
board can be entered in the PC application. This value
will then be automatically deducted from any depth mea-
surements.
Surface is rough.
Rough surfaces (e.g. concrete surfaces with exposed
aggregates) cause additional noise in the signal and may
mean that the depth or diameter of a bar cannot be deter-
mined. In such cases it is also advantageous to scan on
a thin overlay board. The same reminder about deduct-
ing the thickness of the board applies, as above.
"Interference" in images
Interference in images may occur due to:
– Scraps of reinforcement in the concrete
– Tie wires where rebars cross
– Aggregates with ferromagnetic properties
– Ends of bars lying parallel to the scanning plane
– Ends of bars lying orthogonal to the scanning plane
(bars scanned end-on.)
-NOTE-
Diameters and depths calculated in the area where inter-
ference occurs must be treated with caution as they may
be inaccurate.
Scanning columns and beams for penetrations
In such cases where the reinforcement must not be
damaged, ensure that Imagescans are made on at least
three sides of the component in order to ensure that
shear bars (placed at an angle in the concrete) can also
be identified.
Simple diameter check
A simple, rough check of the diameter of the bars in the
first layer can be made by deducting the depth of the
second perpendicular layer from that of the first. This
assumes however that the two layers touch each other
or are at least very close.
7.6 PC software
The PC application provides functions for enhanced
analysis, easy creation of reports, data archival, image
and data export to other PC applications as well as auto-
mated batch processing of large volumes of data.
Instructions for installation of the software can be found
on the PSA 90 PC-SW CD-ROM. Detailed information
about using the PC application can be found in the Help
menu.
Printed: 07.07.2013 | Doc-Nr: PUB / 5070389 / 000 / 00