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Water Level SwitchThis water level sensor is conducive for
liquids that have a conductivity of equal to or
more than 25m Siemens. The system is economical to install as no
special cable is
required for signal transmission. The level 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 level control and
installation systems such as
Two point sensors 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 water level avoiding
material wastage in your process plant. Common applications
include switching pumps
on and off to avoid overflow, dry running and indicating water
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 water level indicator.
Principle
A low AC voltage is applied between the probe electrode and the
tank wall (or referenceelectrode in case of insulated tank). When
the water/liquid comes in contact with the
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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
25 Micro 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 1 BSP Screwed or Flanged mounting.
Operating Temp. -20 C to + 60 C.
Weight ~2 Kg.
Level Probe
Voltage 12 V AC (across probe & tank wall/ grounding
electrode)
Current
