Elcometer Protovale 331 Operating Instructions Manual page 56

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M
EASURING WELDED MESH AND JOINED BARS
Minimum strength signals
Minimum signals are obtained when the search head is over the centre of a
single loop.
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Figure 22. Minimum strength signals at centre of single loop
Ordinary strength signals
Ordinary strength signals are obtained when the head is accurately aligned with
the middle of a side. Only this type of signal is suitable for measuring depth of
cover.
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Figure 23. Ordinary strength signals from middle of one side of a loop
Note: The Orthogonal Sizing function (page 29) must not be attempted on
welded mesh fabric - the bars are too close together for reliable measurement.
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