To Locate Two Layers Of Reinforcement Bars - Elcometer Protovale 331 Operating Instructions Manual

When the search head is approaching a reinforcement bar:
• The Covermeter will start to emit a sound which will increase in pitch as
the search head moves closer to the bar.
• The signal strength indicator bar on the display will increase in length.
• The depth of cover on the display will show a number.
• The LED on the search head will start to glow.
The search head is aligned directly over a reinforcement bar when:
• The pitch of the sound is at its highest.
• The signal strength indicator bar is at its maximum.
• The depth of cover is at its minimum.
• The LED is glowing at its most intense.
7. Record the position of the reinforcement bar (using chalk or similar).

5.3 To locate two layers of reinforcement bars

Layers of reinforcement bars are typically orientated at right angles to each
other. To locate individual layers of reinforcement bars, carry out the procedure
in section 5.2 for each layer.
If the bars in the two layers are of similar size (Figure 9):
Search for the nearer layer first; it gives a stronger signal, and is least influenced
by the other bars. Then search for the second layer, this time scanning the head
in lanes between the previously located positions of the first layer of bars.
• The first scan locates the nearer (top) layer.
• The second scan locates the second (bottom) layer.
First scan
Figure 9. Scanning layers of bars of equal size
L
OCATING REINFORCEMENT BARS
Second scan
R
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