We call this series the “Intelligent Capacitance
Level switch series”. And we do so because this
level switch has a microprocessor that checks
the complete system (including itself) before
validating a signal. You will see a flashing
green LED that serves as heartbeat to indicate a
healthy system. In the case of a system fault
,which may result due to incorrect wiring, open
or short sensor connection, inadequate probe
insulation improper grounding or electronic
insert failure, the heartbeat stops fault LED
glows, display indicates “E---“ and the relay
contacts revert to their fail-safe condition.
The MP-SLC level switch is a highly reliable
liquid and solids level indicator. A two wire
Pulse Frequency Modulation (PFM) is used for
interference-free signal transmission between
probe and evaluation unit. Complete system is
checked before each measurement and the system
has a provision for auto-compensation for
temperature drift in the vicinity of a
pre-amplifier.
The MP-SLC... series exhibits a high degree
programmability. Important functions such as
operating mode (independent/pump control),
delayed switching for probe covered/uncovered
conditions, fail safe high/low, switching
sensitivity, switching delay and set point
calibration are programmable via a keypad. You
can store the programmed parameters in a
non-volatile memory indefinitely requiring no
battery backup.
Technical
Data
Evaluation Unit
Housing
: Cast
aluminium,
Weather-proof
Stoving
enamel
painted,
suitable
for
back panel/wall mounting.
Cable
Entries
: 3 Nos.
of ½”
BSP
Mains
: 110 V
or 230 V
AC (-10
to +10%)
50 Hz
(as
specified
in
order).
Power
Consumption
: 5 VA
approx.
Initial
Capacitance
Adjustment
: 30 pF
to 280
pF in
two
selectable
ranges.
Indication
: 2½
digit,
0.5 inch
Red LED
display;
2 inch
display
is also
available
in
separate housing
Operating
Temperature
: -20o
C
to +60o
C
Utilizable
Capacitance
Variation
: 10 pF
to 4500
pF in
three
selectable
ranges.
Accuracy
: ± 2%
of the
F.S.D.
Outputs
: 0
-100%
digital
display
0/4 -20
mA into
RL max.
400 Ohms
and 0 -5
V
DC for RL >25 KW for remote indicators and recorders.
Dimensions
: 185 mm
x 185 mm
x 85 mm
Weight
: 2.3 Kg
(approx.)
Electronic
Insert - LCD 312
Housing
:
Plastic
with
electronics
potted
in epoxy
resin.
Supply
: 20 V
DC max.
10 mA.
derived
from
Evaluation
Unit.
Measuring
Frequency
: 33 K
Hz
(approx.)
Operating
Temperature
: -20o
C
to + 60o
C.
Probe
Housing
: Cast
Aluminium
, SS,
FRP-coated,
HDPE.
Mounting
:
Flanged
or
Screwed
as per
requirement.
Length :
: 150 mm
to 3000
mm in
Rod,
Greater
than
3000 mm
in Rope.
Insulation
: Part
or full
PVC,
PTFE,
Ceramic
(Part
only)
depending
on
service
temperature
of 80o
C,
200o
C
or 400o
C
respectively.
Reference probe is required,
when the tank is non-metallic.
Grounding tube is required, when
the liquid is turbulent or tank
shape is curved.