Title of Invention	"A LEVEL INDICATOR DEVICE"
Abstract	This invention relates to a level indicator device comprising of plurality of electrodes (1) provided to be disposed at different heights in a container (2), containing liquid the outer ends of the said electrodes (1) are connected to a d.c amplifier (3) characterized in the said d.c. amplifier connected to the control system provided to supply peroidic current to said electrodes (1) so as to collect water level data and stored in memory (4) and to control system having a transistor capacitor (c), a diode and a pair of resistances to provide on or switch off to maintain the level of the liquid in the container (2), the input of an integrated circuit (IC-2) 4011 and the outputs of (IC2) 4011 are connected with the resistances (R). .

Title of Invention

"A LEVEL INDICATOR DEVICE"

Abstract

This invention relates to a level indicator device comprising of plurality of electrodes (1) provided to be disposed at different heights in a container (2), containing liquid the outer ends of the said electrodes (1) are connected to a d.c amplifier (3) characterized in the said d.c. amplifier connected to the control system provided to supply peroidic current to said electrodes (1) so as to collect water level data and stored in memory (4) and to control system having a transistor capacitor (c), a diode and a pair of resistances to provide on or switch off to maintain the level of the liquid in the container (2), the input of an integrated circuit (IC-2) 4011 and the outputs of (IC2) 4011 are connected with the resistances (R). .

Full Text	This invention relates to a level indicator cum for use with the tanks for maintaining the level of the liquid such as water or any other liquid material contained in the tanks. The level indicator is as such known in the art and comprises a pair of electrodes adapted to be disposed in the tank in wherein the level of the liquid is to toe determined. The outer ends of the electrodes are connected to a d.c. amplifier which is connected to an output state provided for supplying current/signals to the visual/ audio indication means. Similarly in the automatic level controllers the output stage is further connected to an activating switch provided to switch-on and switch off the motor so as to maintain the water level in the tank. This device works on the conductivity principle. There are disadvantages associated with the conventional device. One of the main disadvantage is that during the operation of the device the continuous flow of electric current is required between the level sensing electrodes through the liquid/water. As the electrodes have potential difference the chemical effects takes place and therefore, the electrodes are coated with electrically insulating deposits. In some cases, the electrodes are completely dissolved in the liquid/water over a period of time. Another disadvantage is that the electrodes have to be serviced every 2 or 3 months of the operation of the device. In some cases, the electrodes have to be replaced. Still another disadvantage is that the operational life of the device is very small and therefore prevents the under application of the device commercially. Therefore, the main object of this invention is to provide a level indicator cum-controller device which obviates the disadvantage associated with the prior art. Another object of this invention is to provide a level indicator cum-controller device wherein the flow of electric current in the liquid is required periodically. Yet another object of this invention is that the operational life of the device is substantially increased as the harmful depositional on the electrodes have been minimized. According to this invention there is provided a level indicator device comprising of plurality of electrodes provided to be disposed at: different heights in a container, containing liquid the outer ends of the said electrodes are connected to a d.c amplifier characterized in the said d.c. amplifier connected to the control system provided to supply peroidic current to said electrodes so as to collect water level data and stored in memory and to control system having a transistor capacitor (c), a diode and a pair of resistance to provide on or switch off to maintain the level of the liquid in the container, the input of an integrated circuit (IC-2) 4011 to indicate level control and the outputs of (IC2) 4011 are connected with the resistances (R). In accordance with this invention a plurality of electrodes are disposed into the container at the different heights to measure the level of the liquid in the container. Specifically in accordance with that invention electronic control means are provided to collect the water lever data periodically by supplying current to the electrodes, and to store the data in the memory. The water level data collection rate is vet to its lowest possible value appropriate for a given system application. The memory circuit is reset and readied for receiving fresh data as soon as a level data collection cycle commences. Thus, the continuous flow of the electric current required in the conventional level indicator has been avoided. A level indicator cum controller according to a preferred embodiment as herein described and illustrated in the accompanying drawings wherein*-Fig.l. shows the block diagram of the device Fig.2. shows block diagram of the device for a pair of containers Fig.3. shows the circuit diagram of the device. Referring to the drawings particularly fig.l, the device has a plurality of electrodes 1 adapted to be disposed into a container 2 at the different heights. The outer ends of the electrodes 1 are connected to a D.C. amplifier 3 provided to amplify the signals received from the electrodes 1. A memory 4 is connected to the DC amplifier 3. Memory 4 ie connected to the output stage 5 provided to activate visual audio, and switch control means (not shown) connected therewith. A data control 6 is connected to the memory 4. A power supply 7 is connected to the data control 6 and output stage 5 such to energies the device for its operation. During operation of the device the electric supply is provided to the power supply which energies the device. The current is supplied to the electrodes for a very short time to collect the information regarding the level of the water in the container and are stored in the memory. The informations so collected from the electrodes are updated in the memory and the signals are given to the output stage/switch for switching on and switching off the motor for supplying water to the tank. The signals are also provided to the audio and/or visual indicators connected with the output stage 5. Reference is now made to fig. 2 wherein the block diagram of the level indicator cum controller is shown for a plurality of water tanks preferably for a pair of water tanks. The construction of a device is the same as shown in fig. 1 and described hereinabove however the single unit of the data rate control and power supply is used in this device. Reference is now made to fig. 3 wherein the circuit diagram of the device is shown the upper ends of electrodes 1 are connected to inputs of 1C 1 4049 for date storage in memory. Another electrode 2 is provided in the container C for connecting the container to the ground in order to complete the circuit. Bias resistance BR5 & BR6 are provided between +Vdd Supply and the input terminal of integrated circuit (1C 1). The outputs of IC 1 are connected to a set of diodes 1 to 5 having capacitors C1 to C5 connected therewith in parallel. Resistances Rl to R5 are connected with the capacitor Cl to C5. Also resistances Rl to R5 are connected to an integrated circuit (IC-2) 4011 to indicate level. The outputs of IC2 4011 are connected with the resistances R25 to R29. The input ends of IC 2 4011 are connected to the input end of Resistance R7 which is connected to the transistor TR6. The other end of transistor TR6 used as a switch and is connected to a diodes 16 through a diode D6, capacitors C6 & Resistance R6 reset circuit gets activated. This unit constitute a memory circuit. The outputs of R25 to R29 are connected to the transistor TR1 to TR5. The transistors are connected to common regulated voltage. The output of each transistor is connected with the Resistance R16 to R2O respectively. The output of the transistor TR 3 is connected to a diode D1O which is connected to base of TR9 for activating alarm circuit. Diodes DS & D1O makesup an or circuit for alarm at maximum and minimum levels. Memory outs from levels 5 & 4 are connected to nand gates Nl & N2. Resistance R21 & R22 are connected to the base of a transistor TR 9. The Resistance R21 is grounded through a Resistance R22. The emitter of transistor 9 is grounded. The resistance R 24 via R-23 is connected to input of nand gate N4 which is connected to output of a nand gate N3 and one port of nand gate N2. Similarly the input base of the nand gate N 3 is connected to the output of nand gate Nl. The output of the nand gate N2 is also connected to the nand gate N3 input. Input to nand gate N4 is connected to the base of a transistor 10 through a resistance R23. The base of the transistor TR1O is grounded through a resistance R24. The transistor 10 also ground. This assembly constitute the output stage. The output of the resistance R16 to R20 are connected to the visual indicators 1 to 5. The transistor TR 9 is connected to the piezo buzzer which is connected to the power supply via ON/OFF Switch S2. The transistor TR1O is connected to a switch control consisting of diode D 11 having a relay connected therewith in parallel. The switch control is also connected a power supply. At the same terminal wherein the piezo buzzer connected. The pulsed Vdd supply is connected to ICI 4049 for data storage in the memory through a diode D7. The common terminal of the diode D6 and D7 are connected to a transistor TR8 of the date rate control. The input of the transistor TR8 is connected to the power supply. The base of TR8 is connected to the common terminal of the resistance R9 and R1O. The other end to Resistance R1O is connected to a transistor TR7 the -10- base of which is connected to an IC3 555 for date rate control through a resistance Rll. The other end of resistance R9 and TR8 are connected to positive supply. Resistance R12, the diode D8, capacitors C7 resistance R-13, R 14, R 15 and form the tuning circuit of IC 3 555. The Resistance R13 and R14 are also connected in a switching manner with the resistance R15. This assembly constitutes a data rate control. WE CLAIM: 1. A level indicator device comprising of plurality of electrodes (1) provided to be disposed at different heights in a container (2), containing liquid the outer ends of the said electrodes (1) are connected to a d.c amplifier (3) characterized in the said d.c. amplifier connected to the control system provided to supply peroidic current to said electrodes (1) so as to collect water level data and stored in memory (4) and to control system having a transistor capacitor (c), a diode and a pair of resistances to provide on or switch off to maintain the level of the liquid in the container (2), the input of an integrated circuit (IC-2) 4011 and the outputs of (IC2) 4011 are connected with the resistances (R). 2. A level indicator device as claimed in claim 1 wherein said control system has a memory (4) for storing water level data being connected between the d.c. amplifier (3) and output stage (5), a data control (6) adapted to be connected with the power supply (7) and memory (4) and as well as to the d.c. amplifier (3) to energizes the said device for its operation, a plurality of diodes 1 to 5 having a plurality of resistance ( R ) being connected in parallel with said capacitors (C 1 to C5). 3. A level indicator device substantially as herein described and illustrated.

Full Text

This invention relates to a level indicator cum for use with the tanks for maintaining the level of the liquid such as water or any other liquid material contained in the tanks.
The level indicator is as such known in the art and comprises a pair of electrodes adapted to be disposed in the tank in wherein the level of the liquid is to toe determined. The outer ends of the electrodes are connected to a d.c. amplifier which is connected to an output state provided for supplying current/signals to the visual/ audio indication means. Similarly in the automatic level controllers the output stage is further connected to an activating switch provided to switch-on and switch off the motor so as to maintain the water level in the tank. This device works on the conductivity principle.
There are disadvantages associated with the conventional device. One of the main disadvantage is that during the operation of the device the continuous flow of electric current is required between the level sensing electrodes through the liquid/water. As the electrodes have potential difference the
chemical effects takes place and therefore, the electrodes are coated with electrically insulating deposits. In some cases, the electrodes are completely dissolved in the liquid/water over a period of time.
Another disadvantage is that the electrodes have to be serviced every 2 or 3 months of the operation of the device. In some cases, the electrodes have to be replaced.
Still another disadvantage is that the operational life of the device is very small and therefore prevents the under application of the device commercially.
Therefore, the main object of this invention is to provide a level indicator cum-controller device which obviates the disadvantage associated with the prior art.
Another object of this invention is to provide a level indicator cum-controller device wherein the flow of electric current in the liquid is required periodically.
Yet another object of this invention is that the operational life of the device is substantially increased as the harmful depositional on the electrodes have been minimized.
According to this invention there is provided a level indicator device comprising of plurality of electrodes provided to be disposed at: different heights in a container, containing liquid the outer ends of the said electrodes are connected to a d.c amplifier characterized in the said d.c. amplifier connected to the control system provided to supply peroidic current to said electrodes so as to collect water level data and stored in memory and to control system having a transistor capacitor (c), a diode and a pair of resistance to provide on or switch off to maintain the level of the liquid in the container, the input of an integrated circuit (IC-2) 4011 to indicate level control and the outputs of (IC2) 4011 are connected with the resistances (R).
In accordance with this invention a plurality of electrodes are disposed into the container at the different heights to measure the level of the liquid in the container. Specifically in accordance with that invention electronic control means are provided to collect the water lever data periodically by supplying current to the electrodes, and
to store the data in the memory. The water level data collection rate is vet to its lowest possible value appropriate for a given system application. The memory circuit is reset and readied for receiving fresh data as soon as a level data collection cycle commences. Thus, the continuous flow of the electric current required in the conventional level indicator has been avoided.
A level indicator cum controller according to a preferred embodiment as herein described and illustrated in the accompanying drawings wherein*-Fig.l. shows the block diagram of the device
Fig.2. shows block diagram of the device for a pair of containers
Fig.3. shows the circuit diagram of the device.
Referring to the drawings particularly fig.l, the device has a plurality of electrodes 1 adapted to be disposed into a container 2 at the different heights. The outer ends of the electrodes 1 are connected to a D.C. amplifier 3 provided to amplify the signals received from the electrodes 1. A memory 4 is connected to the DC amplifier 3.
Memory 4 ie connected to the output stage 5 provided to activate visual audio, and switch control means (not shown) connected therewith. A data control 6 is connected to the memory 4. A power supply 7 is connected to the data control 6 and output stage 5 such to energies the device for its operation.
During operation of the device the electric supply is provided to the power supply which energies the device. The current is supplied to the electrodes for a very short time to collect the information regarding the level of the water in the container and are stored in the memory. The informations so collected from the electrodes are updated in the memory and the signals are given to the output stage/switch for switching on and switching off the motor for supplying water to the tank. The signals are also provided to the audio and/or visual indicators connected with the output stage 5.
Reference is now made to fig. 2 wherein the block diagram of the level indicator cum controller is shown for a plurality of water tanks preferably for a
pair of water tanks. The construction of a device is the same as shown in fig. 1 and described hereinabove however the single unit of the data rate control and power supply is used in this device.
Reference is now made to fig. 3 wherein the circuit diagram of the device is shown the upper ends of electrodes 1 are connected to inputs of 1C 1 4049 for date storage in memory. Another electrode 2 is provided in the container C for connecting the container to the ground in order to complete the circuit. Bias resistance BR5 & BR6 are provided between +Vdd Supply and the input terminal of integrated circuit (1C 1). The outputs of IC 1 are connected to a set of diodes 1 to 5 having capacitors C1 to C5 connected therewith in parallel. Resistances Rl to R5 are connected with the capacitor Cl to C5. Also resistances Rl to R5 are connected to an integrated circuit (IC-2) 4011 to indicate level. The outputs of IC2 4011 are connected with the resistances R25 to R29. The input ends of IC 2 4011 are connected to the input end of Resistance R7 which is connected to the transistor TR6. The other end of transistor
TR6 used as a switch and is connected to a diodes 16 through a diode D6, capacitors C6 & Resistance R6 reset circuit gets activated. This unit constitute a memory circuit. The outputs of R25 to R29 are connected to the transistor TR1 to TR5. The transistors are connected to common regulated voltage. The output of each transistor is connected with the Resistance R16 to R2O respectively. The output of the transistor TR 3 is connected to a diode D1O which is connected to base of TR9 for activating alarm circuit. Diodes DS & D1O makesup an or circuit for alarm at maximum and minimum levels. Memory outs from levels 5 & 4 are connected to nand gates Nl & N2. Resistance R21 & R22 are connected to the base of a transistor TR 9. The Resistance R21 is grounded through a Resistance R22. The emitter of transistor 9 is grounded. The resistance R 24 via R-23 is connected to input of nand gate N4 which is connected to output of a nand gate N3 and one port of nand gate N2. Similarly the input base of the nand gate N 3 is connected to the output of nand gate Nl. The output of the nand gate N2 is also connected
to the nand gate N3 input. Input to nand gate N4 is connected to the base of a transistor 10 through a resistance R23. The base of the transistor TR1O is grounded through a resistance R24. The transistor 10 also ground. This assembly constitute the output stage. The output of the resistance R16 to R20 are connected to the visual indicators 1 to 5. The transistor TR 9 is connected to the piezo buzzer which is connected to the power supply via ON/OFF Switch S2. The transistor TR1O is connected to a switch control consisting of diode D 11 having a relay connected therewith in parallel. The switch control is also connected a power supply. At the same terminal wherein the piezo buzzer connected. The pulsed Vdd supply is connected to ICI 4049 for data storage in the memory through a diode D7. The common terminal of the diode D6 and D7 are connected to a transistor TR8 of the date rate control. The input of the transistor TR8 is connected to the power supply. The base of TR8 is connected to the common terminal of the resistance R9 and R1O. The other end to Resistance R1O is connected to a transistor TR7 the

-10-
base of which is connected to an IC3 555 for date rate control through a resistance Rll. The other end of resistance R9 and TR8 are connected to positive supply. Resistance R12, the diode D8, capacitors C7 resistance R-13, R 14, R 15 and form the tuning circuit of IC 3 555. The Resistance R13 and R14 are also connected in a switching manner with the resistance R15. This assembly constitutes a data rate control.

WE CLAIM:
1. A level indicator device comprising of plurality of electrodes (1) provided to be disposed at different heights in a container (2), containing liquid the outer ends of the said electrodes (1) are connected to a d.c amplifier (3) characterized in the said d.c. amplifier connected to the control system provided to supply peroidic current to said electrodes (1) so as to collect water level data and stored in memory (4) and to control system having a transistor capacitor (c), a diode and a pair of resistances to provide on or switch off to maintain the level of the liquid in the container (2), the input of an integrated circuit (IC-2) 4011 and the outputs of (IC2) 4011 are connected with the resistances (R).
2. A level indicator device as claimed in claim 1 wherein said control system has a memory (4) for storing water level data being connected between the d.c. amplifier (3) and output stage (5), a data control (6) adapted to be connected with the power supply (7) and memory (4) and as well as to the d.c. amplifier (3) to energizes the said device for its operation, a plurality of diodes 1 to 5 having a plurality of resistance ( R ) being connected in parallel with said capacitors (C 1 to C5).
3. A level indicator device substantially as herein described and illustrated.

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Patent Number

226703

Indian Patent Application Number

483/DEL/1999

PG Journal Number

03/2009

Publication Date

16-Jan-2009

Grant Date

23-Dec-2008

Date of Filing

30-Mar-1999

Name of Patentee

HARBANS LAL DEVGON

Applicant Address

C-8/8756, VASANT KUNJ, NEW DELHI-110 070, INDIA.

Inventors:

#	Inventor's Name	Inventor's Address
1	HARBANS LAL DEVGON	NATIONAL OF C-8/8756, VASANT KUNJ NEW DELHI-110 070

PCT International Classification Number

G08B 21/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA