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Automatic Water Level Controller (AWLC)

Paper Type: Free Essay Subject: Communications
Wordcount: 830 words Published: 11th Dec 2017

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Automatic Water Level Controller (AWLC) will automatically START the pump set as soon as the water level falls below the predetermined level (usually kept half or 2/3rd tank) and shall SWITCH OFF the pump set as soon as tank is full or water level in the lower tank is at below minimum level.


AWLC provides you the flexibility to decide for yourself the water levels for operations of pump set in upper/lower tanks.

Built in Indications for showing Full, Empty Levels in Upper Tank and Lower Tank Empty Indication.

MANUAL operation switch for special operations like watering the plants from pump set.

The AWLC ensure no overflows or dry running of pump there by saves electricity and water.

Low AC Voltage sensing circuit to avoid polarization of electrodes in water (requires very rare cleaning of electrode ends). Provided with special stainless steel conductive electrodes.


Consume very little energy, ideal for continuous operation.

Water Level Sensor


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 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.


The SLW… series water level switches work to maintain a constant water level avoiding material wastage in your process plant. Common applications also 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 /sensor.


A low AC voltage is applied between the probe electrode and the tank wall (or reference electrode in case of insulated tank). When the water/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


: aluminium, Weather-proof enamel painted suitable for back panel/wall mounting.

Cable Entries

: 3 Nos. of ½’ BSP


: 110 or 230 Volts AC (-15 to + 10%) 50 Hz.

Relay Output

: 50Hz for non-inductive load.

Power Consumption

: 5 VA .

Fail-Safe Mode

: High or Low field selectable.

Response Time

: 0.5 secs

Switching Delay

: 0.5 to 20 seconds

Maximum Sensitivity

: 25m Siemens

Operating mode

: (A) Single point switching.


: Red LED for Alarm, Green LED for Normal.

Operating Temp.

: -20º C to + 60º C.


: ~2 Kg.


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