Elcometer Protovale 331 Operating Instructions Manual page 62

R
S
EARCH HEADS
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
t
looking sideways (at right angles to the axis of the probe) - Figure 27. A switch
on the handle controls which search field is active.
Figure 27. 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.
Note: Orthogonal sizing is not possible with the Borehole Probe and the SIZE
function is therefore removed from the reading screen when this type of probe
is connected to the Covermeter.
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 28 overleaf).
To scan for reinforcement bars or ducts in line with (in front of) the end of
the borehole: Set the switch to the forward looking position and push the
Borehole Probe into the drilled hole slowly.
t. Whenever the position of the switch is changed, the Covermeter must be zeroed.
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