Ta To Locate Two Leyere Of Reinforcement Bars - Elcometer 331 Operating Instructions Manual

elcometee ;
LocATING
REINFoRcEMENT
BARS
.
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
8
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
lf
the bars
in the
two
layers are
of similar size (Figure
10):
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
locatod positions
of
the first layer of bars
.
The first scan
locates
the nearer (top) layer
.
The second scan locates the second (bottom)
layer.
Figure
10.
Scanning
layes
of bars of
equal
size
lf the bars
in
the
nearer layer are
thin compared with those
in
the deeper layer (Figure
11):
Search
for the
deeper layer
first;
it
gives
a
stronger signal, and
is
least influenced
by
the other bars
Then
search for the nearer layer, this
time
scanning
the
head
in lanes between the now-known
positions
of the deeper lay€r of bars
.
The first scan
locates
the second (bottom) layer
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