13
CALIBRATION
Step
Seven
After
it
is
installed
in
place,
the
must
be
calibrated
by
the
user
before
operation.
Everything
needed
for
the
procedure
is
self
‐
contained
within
the
electronics
of
the
LVP
‐
51
‐
R
level
switch.
Two
dielectric
states—full
condition
and
empty
condition—are
measured
by
the
LVP
‐
51
‐
R,
and
then
averaged
to
set
the
threshold
between
“wet”
and
“dry”
at
the
sensor.
The
empty
state
must
be
at
least
6"
below
the
bottom
of
the
sensor
for
calibration.
The
full
state
must
be
to
the
top
of
the
sensor
(not
just
to
the
point
of
actuation)
for
calibration.
The
actual
application
fluid
at
its
intended
operating
temperature
must
be
used
during
calibration.
Use
the
following
procedure
assumes
that
the
sensor
has
already
been
wired
to
a
power
supply.
1.
Remove
the
cap
from
the
sensor
body
by
loosening
the
two
screws
located
below
the
sensor.
Do
not
remove
the
screws
from
the
sensor.
Insert
a
small
screwdriver
into
the
small
slot
at
the
edge
of
the
cap
and
gently
pry
upwards.
2.
Looking
down
you
will
see
a
small
three
‐
position
switch
and
two
trim
pots
marked
Full
and
Empty.
You
may
start
with
whatever
state
the
tank
is
in.
3.
Full
state:
With
the
tank
filled
to
the
top
of
the
sensor,
set
the
switch
to
the
Full
position
(right).
Make
sure
your
hands
or
any
other
objects
are
not
touching
the
sensor
while
calibrating
because
this
will
cause
a
false
reading.
Using
a
small
nonmetallic
screwdriver
or
alignment
tool,
turn
trim
pot
Full
until
the
LED
just
lights,
and
no
farther.
Note
the
position.
Now
turn
the
trim
pot
back
until
the
LED
turns
off.
The
ideal
setting
for
the
trim
pot
is
midway
between
these
on
and
off
points.
4.
Empty
state:
With
the
tank
drained
to
a
point
no
closer
than
6
inches
below
the
bottom
of
the
sensor,
set
the
switch
to
the
Empty
position
(left).
Set
the
Empty
trim
pot
as
in
Step
3.
5.
After
completing
calibration,
make
sure
to
return
the
switch
to
the
center
position.
Snap
the
cap
back
on
by
pressing
down,
and
tighten
the
two
screws.
