Maxpip; Under Cover - Elcometer 331 SH Operating Instructions Manual

11.2 Maxpip™

This is an alternative method of locating the centre of each reinforcement bar. In this mode, an audio
'pip' is given each time the middle of a reinforcement bar is detected as the surface is scanned.
An icon on the main measurement display indicates that Maxpip™ mode is
active. When Maxpip™ mode is active, the normal locate sound is
suppressed.
In practice, since it is not possible to be sure that you have reached
maximum signal until the signal has started to decrease again, the pip
always occurs just after you have passed the actual position of the bar, and this inevitable lag varies
with scanning speed. Therefore the Locate mode is far superior for audible location.

11.3 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 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 (
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.
MENU / SETUP / LIMITS / LOW LIMIT), Under Cover mode will
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OUND MODE ETECTION MODE
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