15
ELECTRICAL
Step
Five
Supply
Voltage:
The
supply
voltage
to
the
powered
level
switch
should
never
exceed
a
maximum
of
36
VDC
(30
VDC
with
LTU
‐
101A
series).
Omega
Engineering
controllers
have
a
built
‐
in
13.5
VDC
power
supply
which
provides
power
to
all
of
Omega
Engineering’s
electrically
powered
sensors.
Alternative
controllers
and
power
supplies,
with
a
minimum
output
of
12
VDC
up
to
a
maximum
output
of
36
VDC
(30
VDC
with
LTU
‐
101A
series),
may
also
be
used
with
the
powered
level
switch.
Required
Cable
Length:
Determine
the
length
of
cable
required
between
the
powered
level
switch
and
its
point
of
termination.
Allow
enough
slack
to
ensure
the
easy
installation,
removal
and/or
maintenance
of
the
sensor.
The
cable
length
may
be
extended
up
to
a
maximum
of
1000
feet,
using
a
well
‐
insulated,
14
to
20
gauge
shielded
four
conductor
cable.
Wire
Stripping:
Using
a
10
gauge
wire
stripper,
carefully
remove
the
outer
layer
of
insulation
from
the
last
1
‐
1/4"
of
the
sensor's
cable.
Unwrap
and
discard
the
exposed
foil
shield
from
around
the
signal
wires,
leaving
the
drain
wire
attached
if
desired.
With
a
20
gauge
wire
stripper,
remove
the
last
1/4"
of
the
colored
insulation
from
the
signal
wires.
Signal
Outputs
(Current
sensing):
The
standard
method
used
by
Omega
Engineering
controllers;
this
technology
uses
only
two
wires
(Red
and
Black).
The
sensor
draws
5
mA
when
it
is
dry
(8mA
with
LTU
‐
101A
series),
and
22
mA
when
wet.
NC/NO
status
must
be
set
by
the
controller.
The
White
and
Green
wires
are
not
used.
Signal
Output
(Relay
switching):
Allows
the
sensor
to
switch
a
small
load
on
or
off
directly,
using
an
internal
1A
relay
(60
VAC/60
VDC).
The
sensor
uses
the
relay
and
features
4
wires
(red,
black,
white
and
green)
and
a
shield
wire.
The
NO/NC
status
is
set
by
the
polarity
of
the
voltage
feeding
the
red
and
black
wires.
The
green
wire
is
the
common
for
the
relay
and
the
white
wire
is
the
NO
or
NC,
depending
on
the
polarity
of
red
and
black.
Normally
Open
Wiring:
Normally
Closed
Wiring:
