5
Wiring
the
EchoSwitch®
The
following
wiring
diagram
can
be
used
when
wiring
to
the
EchoSwitch®
relays.
Note:
All
three
relays
share
the
COM
terminal.
Relay
1
has
both
a
NO
and
NC
terminal
while
Relays
2
and
3
have
just
a
NO
terminal.
Note
#1
–
Isolate
power
to
instrument
from
power
to
load
(pumps,
etc.)
as
much
as
possible
by
running
power
to
the
sensor
directly
from
main
power
source.
The
following
wiring
diagrams
can
be
used
for
the
4
‐
20
mA
output
of
the
EchoSwitch®.
Some
notes
on
safety:
Where
personal
safety
or
significant
property
damage
can
occur
due
to
a
spill,
the
installation
must
have
a
redundant
backup
safety
system
installed.
Wiring
should
always
be
completed
by
a
licensed
electrician.
The
sensor
must
be
chemically
compatible
with
the
application.
Design
a
fail
‐
safe
system
for
possible
sensor
and/or
power
failure.
Never
use
the
sensor
in
classified
hazardous
environments.
