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R
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EARCH HEADS
Borehole Probe
The Borehole Probe is used to locate reinforcement bars, tendon ducts and other metallic objects
in the vicinity of holes drilled into concrete. The probe will also measure depth of cover over a limited
range, making it ideal when attempting to drill through a structure without making contact with
reinforcement bars or tendon ducts. The Borehole Probe is available in two lengths; 400 mm (16")
and 1000 mm (40").
The Borehole Probe has two search fields; forwards looking and sideways looking. Readings can
be taken looking forward from the end of the probe or looking sideways (at right angles to the axis
q
of the probe) - Figure 19. A switch
on the handle controls which search field is active.
Figure 19. Borehole probe search fields
The body of the probe has a scale marked every 10 mm (0.5") along its length. Use this scale to
measure the depth of reinforcement bars located to one side of the hole. The scale indicates
distance from the centre of the sideways looking sensor in the probe. To measure the depth of the
borehole, add 15 mm (0.6") to the reading taken from the scale.
The sideways looking search field is located on the side of the Borehole Probe marked with the
scale.
To scan for reinforcement bars to the side of the borehole: Set the switch to the sideways
looking position and move the Borehole Probe into the drilled hole, slowly rotating the probe through
360° (Figure 20 overleaf).
q.
Whenever the position of the switch is changed, the Covermeter must be zeroed.
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