Under Cover - Elcometer Protovale 331 Operating Instructions Manual

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OUND MODE ETECTION MODE

10.3 Under Cover

Under Cover mode enables you to set a minimum depth of cover. In this mode,
the Covermeter will signal a continuous alarm sound and the search head LED
will illuminate if the depth of cover of the reinforcement bar is less than the
minimum.
An icon on the main measurement display indicates that
Under Cover mode is active. When Under Cover mode is
active, the normal locate sound is suppressed.
The Lower Limit (from the LIMITS menu) is used as the
Under Cover threshold.
When Under Cover mode is active, the Low Limit is displayed and activated and
may be adjusted. If Low Limit is switched off (
LOW LIMIT), Under Cover mode will be switched off also.
Under Cover mode cannot be selected at the same time as Locate mode.
Maxpip™ and Under Cover modes can both be used simultaneously. When
Locate mode is selected, Maxpip™ and Under Cover mode will both be
switched off.
A bar of larger size than expected (rather than a bar at shallower cover) may
trigger the Under Cover alarm; however, having drawn your attention, you will
be able to see from the autosize information on the display just what is under
the search head.
Note that although the Under Cover mode is a useful feature, it has some
limitations which should not be ignored. Probably the most important, is that it
will not distinguish between;
• a bar which is correctly present at more than minimum cover, and
• a bar which is completely missing!
Similarly, a bar (or tie-wire) at just less than minimum cover, but of smaller
diameter than that set, may also fail to signal.
It is worth noting that this is not the only way of rapidly recognising
reinforcement bars with less than the usual amount of cover. "Locate" on
page 34 describes how the ordinary sound signal will give a noticeably more
intense sound whenever the search head passes over a reinforcement bar
which is shallower than its neighbours. This is possibly a simpler way of drawing
your attention to rogue reinforcement bars without the need to use the Under
Cover mode.
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MENU / SETUP / LIMITS /