17
© 2012 by Proceq SA
The right hand side straight section almost cer-
tainly corresponds to passive reinforcement. This
is displayed automatically in the “Chipping Plot”
in green.
In the overlapping range active corrosion and
areas of passivity can be present with the same
potential values. Areas with potential values in
this area are displayed automatically in yellow in
the “Chipping Plot”. In this overlapping range it is
assumed that a definite statement on the corro-
sion state is not possible and such sub-sections
may only be evaluated by more extensive inves-
tigations.
4.11 Confirmation and refining of hotspot positions
Once the potentials have been evaluated, it is recommended to make openings in the concrete to
verify the threshold potential. Prior to making the opening it is recommended to locate the exact posi-
tion of the reinforcement bars by means of a rebar locator (e.g. Proceq’s Profometer, Profoscope).
Moreover a fine measurement with the Rod Electrode using a small grid is recommended to deter-
mine the actual “Hotspot” (local potential minimum).
5 General Settings
5.1 Backlight
The display has a back light which can be switched on or off by pressing the END button for more
than 2 seconds when the measurement screen is displayed. When the backlight is on, an asterisk is
shown in the top right hand corner.
5.2
Navigating around the menus
The diagrams in Fig 5.1 and Fig 5.2 show the menu structure for configuring the equipment for
potential measurement and electrical resisitivity measurement respectively. On start up, the measur-
ing screen is shown. Press MENU to access the main menu for the mode selected.
For all the selected menus: Use the
↑↓
and
← →
buttons to select menu items and adjust settings.
•
If the option START is indicated at the bottom of the screen, pressing this will take you to the
selected menu item.
•
Pressing MENU saves the settings and takes you back to the main menu.
•
Pressing END saves the settings and takes you to the measurement screen.
5.3
Selecting the operating mode
Wenner Probe
– This menu item switches between operating modes.
For potential measurement it is OFF.
For resistivity measurement it is ON.
