This water level sensor is conducive for
liquids that have a conductivity of equal to or more than
25m Siemens. It is your best choice for
a water level switch. The system is economical
to install as no special cable is required for
signal transmission. The probe and the
evaluation unit can be connected using a long
cable. The AC is provided on the probe for
preventing electrode deterioration. You can
choose from among a variety of control and
installation systems such as
Two point for independent switching and
automatic control of pump.
Four point switching with two pump
control logic.
Three point switching: two for pump
control logic and one independent point with
or without a settable delay (for probe
covered or uncovered).
A variety of probes is available for
your specific process.
Applications
The SLW... series water
level switches work to maintain a constant level
avoiding material wastage in your process plant.
Common applications also include switching pumps
on and off to avoid overflow, dry running and
indicating liquid level in an empty tank to
avoid wear and tear and production stoppage.
Many of our customers in the Food, Power,
Chemicals, Sugar, Detergent, Steel, Minerals and
Textile industry have used the SLW... series
liquid level switch.
Principle
A low AC voltage is applied
between the probe electrode and the tank wall
(or reference electrode in case of insulated
tank). When the liquid comes in contact with the
electrode tip, a conductive path is established
between the sense electrode and the tank
wall/reference electrode. This current is
sensed, amplified and made to operate a relay
whose contacts in turn can be used for
annunciation/control.
Technical
Data
Evaluation Unit
Housing
: Cast aluminium,
Weather-proof Stoving
enamel painted suitable
for back panel/wall
mounting.
Cable Entries
: 3 Nos. of 1/2 “ BSP
Mains
: 110 or 230 V AC (-15
to + 10%) 50 Hz (as
specified in order).
Relay Output
: One set of potential
free change over
contacts rated at 6A 230
V AC, 50Hz for
non-inductive load.
Power Consumption
: 5 VA approx.
Fail-Safe Mode
: High or Low field
selectable.
Response Time
: 0.5 second
Switching Delay
: 0.5 to 20 seconds for
probe covered and
uncovered condition
Maximum Sensitivity
: 25m Siemens
Operating mode
: (A) Single point
switching.
(B) Two-point
switching with pump
control logic.
Indication
: Red LED for Alarm,
Green LED for Normal.
Mounting
: 1½” BSP screwed or
Flanged mounting.
Operating Temp.
: -20º C to + 60º C.
Weight
: ~2 Kg.
Probe
Voltage
: 12 V AC (across probe
& tank wall/ grounding
electrode)
Current
: <4 mA (between probe &
tank wall/grounding
electrode through
liquid)
Operating Temp.
: Up to 80º C (Standard
model)
: Up to 200º C
(Optional)
_14.jpg)
Water Level Sensor
