Elcometer Protovale 331 Operating Instructions Manual page 34

M
EASURING SIZE OF REINFORCEMENT BARS
8. Position the search head parallel and in line with the reinforcement bar
(Figure 15). The sound/signal will be at a maximum.
Figure 15. Search head parallel and in line with bar
9. Press . The display will show:
10.Rotate the search head until it is at 90° (orthogonal) to the bar. Use the
notches in the sides of the search head and the line across the top of the
search head to aid alignment (Figure 16). The sound/signal will be at a
minimum when the search head is aligned at 90° to the bar and the
notches/line are in line with the bar.
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Figure 16. Search head aligned at 90°
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ORTHOGONAL
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