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 Compact
Admittance type level switch (PLATYPUS) |
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Intelligent and Self Checking |
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SAPCON 'PLATYPUS' is a
high-performance microprocessor-based level
limit switch working on the admittance
principle. It is intelligent and reliable. It
incorporates a special 3-element probe utilizing
the driven shield principle, so it can tolerate
certain amount of coating. It is immune to
material build-up. It is easy to calibrate with
the help of a push-button. It provides 4 or 20
mA and open collector (PNP) output for detection
of high and low process material levels. Probe
covered and/or uncovered delay can be programmed
as desired. Calibration keys can be locked to
avoid data tampering. |
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Salient Features |
Easy to calibrate, using a
push-button.
Rugged probe construction.
Compact size and short insertion
length, ideal for use in
constricted places.
Low maintenance with no moving
parts.
Modular construction, so low
down time.
Driven shield system. Can
tolerate certain amount of
coating.
Immune to build-up.
Easy installation with
verification by built-in LED's.
Selectable fail-safe condition
(high/low).
Programmable probe covered
and/or uncovered delay.
Visual indication for output
status (red LED) and power-on
(green LED).
4 or 20 mA output for detection
of high and low process material
levels.
Open collector (PNP) output.
Automatic
(microprocessor-controlled)
switch-point optimization.
Locking facility provided to
avoid data tampering.
Calibration error indication
(flashing red LED) in case of
wrong calibration.
Fault indication both gr een and
red LED flashing, in case of
sense-ground short and sense
shield short condition. |
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Application |
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Sapcon 'Platypus' is ideal for
use in constricted places due to
its compact size and short
insertion length. It can be used
for detecting level in vessels
containing solids that are
granular, powdery; liquids and
slurries. It can be used in
dusty plant environment. |
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System Description |
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The
sense
and
ground
element
of the
probe
form the
electrodes
of a
capacitor
with the
service
material
as the
dielectric.
When the
probe is
not
covered,
the
dielectric
is of
air,
whereas
when
covered,
it is
that of
the
service
material.
A change
in the
physical
level of
the
material
causes a
change
in the
dielectric
media
between
the two
electrodes,
thus
causing
a change
in the
measured
capacitance.
This
change
is
sensed
and
corresponding
outputs
(4/20mA
and open
collector
output
present/absent)
are
given
according
to the
fail-safe
condition.
Red LED
indicates
the
alarm
condition
(4mA and
open
collector
output
absent)
and
green
LED
indicates
the
power-on
condition.
Probe
covered
and/or
uncovered
delay,
can be
set as
desired.
Calibration
can be
done
easily
with the
help of
a
push-button.
The
switch-point
is
optimized
automatically,
with the
help of
a
microprocessor.
The
calibration
keys can
be
locked
to avoid
tampering
of data
by
unauthorized
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Technical Data |
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Evaluation Unit
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Power
supply |
15 -28V
DC |
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Outputs |
4/20mA
current
output
open
collector
(PNP)
output |
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Max.
Load at
24 V DC |
600 ohms
(for
4/20mA
current
output) |
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Max.
Load
current |
300mA
(for
open
collector
PNP
output) |
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Indication |
PILOT :-
Green
LED
(power-on)
ALARM :-
Red LED
(output/switching
status) |
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Fail-safe
mode |
High or
Low
(field
selectable) |
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Switching
delay |
Programmable
for
probe
covered
and/or
uncovered
condition |
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Housing |
Cast
aluminium
weather-proof |
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Cable
entry |
1 no. ½”
BSP |
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Sensor
mounting |
1” BSP /
NPT |
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Probe
Insertion
length |
100 mm |
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Enclosure
lid |
Transparent |
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Weight |
~1.300
Kg |
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