Choosing The Appropriate Electrode; Connect To The Reinforcement - Proceq PM8500 User Manual

ensure the correct grid between parallel measurement paths marks can be drawn on the
surface. Please note the 4-Wheel Electrode ensures a stable parallel grid and requires less
marks to be drawn on the surface.

4.1.3 Choosing the appropriate electrode

Depending on the surface under test, it is necessary to choose which type of electrode will be
employed.
For small areas or areas that are difficult to access, the small and light Rod Electrode will
typically be used.
For more accessible horizontal, vertical, or overhead surfaces, it is much faster to use the 1-
Wheel Electrode.
For large horizontal surfaces, the 4-Wheel Electrode is recommended for the reason of the
significantly faster automatic measurement in a pre-defined grid.

4.1.4 Connect to the reinforcement

The ground cable must be connected to the reinforcement of the surface to be measured. This
is usually done by chiseling or drilling to the reinforcement.
In some cases, it may be possible to use existing building elements that are connected to the
reinforcement (e.g., water pipes, earth points). The connection to the reinforcement should be
made with the least possible resistance. To this end it may be beneficial to grind the
reinforcement (e.g., using an angle grinder) and to connect the cable with welding tongs.
A secure connection can be also obtained by drilling a 25 mm hole into the concrete above the
rebar, then drill a 4 mm hole into the rebar and insert a self-tapping screw with attached lead
into the hole in the steel.
The connection should be tested for continuity. This requires at least one other point of the
reinforcement to be exposed and to check the resistance between the two with an Ohmmeter.
The connections should be situated as far as possible in opposing corner areas of the surface
under test. The measured resistance should not be more than 1 Ω above the resistance of the
cable used.
25. September 2023 © Copyright 2023, PROCEQ SA 14