3
INTRODUCTION
Step
One
About
Non
‐
Intrusive
RF
Capacitance
Technology:
OMEGA
ENGINEERING's
LVP
‐
51
‐
R
level
switch
generates
a
high
radio
frequency
signal
from
the
capacitance
electrode
on
the
tank
side
of
each
sensor.
Depending
on
the
thickness
of
the
tank
wall
and
the
material
of
which
it
is
made,
there
is
a
particular
minimum
dielectric
value
the
electrode
measures
when
there
is
no
liquid
on
the
other
side
of
the
tank
wall
from
the
sensor.
When
liquid
is
on
the
other
side
of
the
wall,
the
dielectric
value
rises.
As
part
of
installation,
a
two
‐
step
calibration
procedure
ensures
that
the
threshold
between
wet
and
dry
is
set
at
the
ideal
point
for
your
particular
tank
and
application
fluid,
without
the
use
of
any
external
test
equipment.
The
sensor’s
operation
and
point
of
actuation
may
vary
based
on
the
dielectric
properties
of
various
application
liquids,
tank
materials
and
thicknesses.
The
LVP
‐
51
‐
R
sensor
is
intended
to
be
used
with
liquids
with
a
dielectric
value
between
20
and
80.
Due
to
its
user
calibration
capability
it
may
be
able
to
detect
liquids
below
a
dielectric
constant
of
20
under
certain
conditions,
but
this
must
be
verified
by
experimentation.
Table
of
Contents
Specifications
&
Dimensions:
.................................................................................................................................
4
Safety
Precautions:
................................................................................................................................................
5
Make
a
Fail
‐
Safe
System:
...........................................................................................................................
6
Components:
..............................................................................................................................................
6
Installation:
............................................................................................................................................................
7
Attach
fitting
to
Tank:
................................................................................................................................
7
Mount
Sensor
in
Fitting:
............................................................................................................................
7
Electrical:
................................................................................................................................................................
8
Signal
Output
(current
sensing):
................................................................................................................
8
Signal
Output
(relay
switching):
.................................................................................................................
9
Wiring:
..................................................................................................................................................................
10
Wiring
to
a
OMEGA
ENGINEERING
Controller:
........................................................................................
10
Switching
Inductive
Loads:
.......................................................................................................................
10
Wiring
the
Relay
Output:
.........................................................................................................................
11
Wiring
as
a
P
‐
Channel
or
N
‐
Channel
Output:
..........................................................................................
12
Calibration:
...........................................................................................................................................................
13
Maintenance:
.......................................................................................................................................................
14
Checking
Point
of
Actuation:
...................................................................................................................................
14
Testing
the
Sensor:
..................................................................................................................................................
14
Maintenance:
..........................................................................................................................................................
14
