Rev
5
MN890570
19
of
30
WIRING
Step
Eight
Switching
Inductive
Loads:
The
use
of
suppressors
(snubbers)
is
strongly
recommended
when
switching
inductive
loads
to
prevent
disrupting
the
microprocessor’s
operation.
The
suppressors
also
prolong
the
life
of
the
relay
contacts.
Suppression
can
be
obtained
with
a
catch
diode
for
DC
circuits
and
a
resistor
‐
capacitor
(RC)
for
AC
circuits.
Catch
Diode
Always
use
stepper
relays
between
the
sensor
and
external
loads.
For
DC
circuits
use
a
catch
diode
such
as
1N4148,
shown
on
left.
Refer
to
the
following
circuits
for
RC
network
assembly
and
installation:
Choose
R
and
C
as
follows:
R:
0.5
to
1
Ohms
for
each
volt
across
the
contacts
C:
0.5
to
1
μ
F
for
each
amp
through
closed
contacts
Notes:
1. Use
capacitors
rated
for
250
VAC.
2. RC
networks
may
affect
load
release
time
of
solenoid
loads.
Check
to
confirm
proper
operation.
3. Install
the
RC
network
at
the
meters
relay
screw
terminals.
An
RC
network
may
also
be
installed
across
the
load.
Experiment
for
best
results.
Voltage
Output:
Series
ULS
can
be
used
as
a
0
to
5
or
0
to
10
VDC
output
device.
A
resistor
will
need
to
be
added
to
the
circuit
to
enable
a
voltage
output
(refer
to
the
wiring
diagram
below).
0
‐
5
VDC
output
o
Add
a
250
Ohm
resistor
o
Actual
output
will
be
0.8
to
5
VDC
0
‐
10
VDC
output
o
Add
a
500
Ohm
resistor
o
Actual
output
will
be
2
to
10
VDC
When
using
ULSX
‐
CAL,
under
Number
of
Pumps
,
select
4
‐
20
mA
Transmitter
Only
to
simplify
the
configuration
in
ULSX
‐
CAL.
