CPC 809-1060 Manual de instalación y funcionamiento - Página 9

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L D
S
Leak Detector
SYsfem
Manual
SENSOR CONNECTIONS
CONtiNUEd
All
sensor cables should be shielded and isolated from power circuits. Do NOT put them
in conduits containing power. They may be run in conduits containing
gth.er shielded
analog signal cables
to
other equipment. Do not run together with digital data busses
such as
RS232
or
RS485.
4. ANALOG OUTPUTS
o
A. OUTPUT VOLTAGE
Each analog output has
a 0 volt
to
+5.0 volt
DC range representing 0
to
1000 ppm
refrigerant concentration measured.
Sensor offsets (especially if not properly adjusted) can cause an analog output
to go
as
low as -0.10
voit.
The analog
oltputs
6an hot
go any lower
due
to a clamping circuit
in
each output.
Analog outputs can go higher
than +5.0
volts if refrigerant concentration exceeds
1000
ppm. The highest possible output voltage is
about
+ 10.5 volts.
A shorted analog output will not be damaged
(unless
it is shorted
to
a power
source.),
and will not interiupt ihe alarm and meter functions of the L D
S.
Unused (open circuit)
analog outputs also do not affect the alarms and the meter.
.
B.
COMMON
NEGATIVE, SIX POSITIVES
All six analog outputs share a common negative, marked 0V (zero volts). There are two
terminals
for
it.
The six analog outputs each have a separate terminal (on TB7) for the positive side.
The terminal block may be unplugged without removing wires from it if
desired.
lt
will
also fit through a hole
in
the bottom
of
the enclosure while wires are attached to
it.
o
C. CABLING
Shielded cable
is
recommended when using
the
analog
outputs.
One
of the
0V
terminals may be used for the common, and the other for the shield. The terminals
are
marked
(on
terminal block TB7) accordingly. See Fig.
1.
-4'