Title of Invention

A DEVICE FOR CONTROLLING THE LEVEL OF LIQUIDS

Abstract A device for controlling he level of a liquid in an overhead tank fed from a sump, comprising a switch furnishing electric power directly to a motor coupled to a pump for pumping liquid from a sump to an overhead tank; a control board to which the said switch on auto setting supplies electric power through a transformer; two sets of probes provided for the sump and the overhead tank respectively, each set including a lower probe, an upper probe and a common probe, said probes of the sets being connected to the control board; a relay connected to the output of the control board and to the said motor, whereby whenever the liquid in the sump reaches the level of the lower probe, the said probe senses the liquid level to trigger the control board to de-energise the relay, to switch off the motor; and whenever the liquid in the overhead tank either reaches the level of the upper probe or the level of the lower probe, the concerned probe senses the liquid level to trigger the control board and either de-energise the relay, to switch off or switch on the motor; a dry sensing probe for triggering the control board to de-energise the relay and switch off the motor whenever no liquid emerges from the delivery line of the pump over a predetermined interval of time; and audio and/or visual indication means which are activated by the control board whenever triggered by the dry sensing probe.
Full Text

This invention relates to a device for controlling the level of liquidsp more particularly, the level of liquids in overhead tanks fed from sumps and welIs.
The device proposed herein has a manua1 override by which the operator can manually switch on and switch off the motor which is coupled to the pump.
The said device has an automatic mode also by which the operator can allow the device to operate on its own. Thus whenever there is adequate liquid in the sumpp the motor is automatically switched on to pump liquid to the overhead tank, provided that the water level in the sump or well (hereinafter called the sump) is above the lower probe* When the overhead tank is ful1 the motor is automatically switched off, that is^ when the level of water reaches the upper probe of the overhead tank.
Similarlyf when the level of water in the overhead tank reaches the lower probe level,. the motor wil 1 be switched on automatically and when the level of water

in the sump goes below the lower probe^ the motor will be switched off automatically.
In case there is any interruption in the flow of liquid from the pump for a predetermined interval e.q.l#5 minutes^ the motor is automatically switched off. Simultaneously, there is an audio and /or visual indication to alert the operator.
The device, according to this invention, for controlling the level of a liquid in an overhead tank fed from a sump, comprises a switch which, on its manual setting^ furnishes electric power directly to an electric motor coupled to a pump, for pumping liquid from the sump to the overhead tank; a control board to which the said switch, on its auto setting, supplies electric power, through a transformer; two sets of probes provided for the sump and the over head tank respectively, each set including a lower probe, an upper probe and a common probe, said probes of the sets being connected to the control board; a relay connected to the output of the control board &n(^ to the

said motor, whereby whenever the 1iquid in the sump reaches the level of the lower/ tne said probe senses the liquid level to trigger the control board to de-energise the relay^ to switch off the motorand whenever the liquid in the overhead tank either reaches the level of the upper probe or the level of the lower probe^ the concerned probe senses the liquid level, to trigger the control board and either de-energise or energise the relay, to switch off or switch on the motors a dry sensing probe for triggering the control board to de-energise the relay and switch off the motorV whenever no liquid emerges from the delivery line of the pump over a predetermined interval of time; and audio/visual indication means which are activated by the control board, whenever triggered by the dry sensing probe.
Various other features of the device proposed hergin will be apparent from the further description given hereunder with reference to the accompanying drawings which illustrate, by way of example, one of possible

embodiments of the device proposed hereinp wherein
Fig-1 illustrates a layout of the device including the motor—pump set* the sump and overhead tank^ the probes and the control board
and
Fig.2 illustrates a block diagram of the operating system.
The embodiment illustrated is intended for controlling the level of a liquid in an overhead tank T fed from a sump S. The embodiment comprises a threeway toggle switch E which, on its manual setting ^ furnishes electric power directly to an electric motor M (coupled to a pump), for pumping liquid from the sump to the overhead tank.
The said switch Et. on its auto setting» supplies
electric power to a control board B^ through a
transformer F*
Two sets of probes mrm provided for the sump and the

over head tank respectively, each set including
a lower probe LI L2, a common probe CI C2 and an
upper probe Ul U2j said probes of the sets being
connected to the control board B.
A relay R is connected to the output of the control board B and to the said motor M, whereby whenever the liquid in the sump S reaches the level of the lower probe LI the said probe senses the liquid level to trigger the control board B.de-energise the relay. So also when the liquid in the overhead tank either reaches the level of the upper probe U2 or the level of-the lower probe L2y the concerned probe senses the liquid level to trigger the control board and de-energise or energise the relay, as the case may be. The relay when energised switches on the motor and when de-energisedgi switches off the motor.
At the end of the delivery pipeline of the pump, a dry sensing probe D is provided. Whenever the motor is on (that is when the pump is in operation) if no liquid

emerges at the said delivery endp o^/&r a predetermined interval of time e.g. 1.5 minutes, the dry sensing probe triggers the control board to de-energise the relay» thus switching off the motor. At the same time An audio and/or visvxstlsignal or both go into operation to alert the operator.
The terms and expressions in this specification Are of description and not of limitation« there being no intention in the use of such terms and expressions of excluding any equivalents of the features illustrated and describedp but it is understood that various other embodiments of the device proposed herein ^re possible without departing from the scope and ambit of this invention-





We Claims
1. A device for controlling the level of a liquid in an overhead tank fed from a sump^ comprising a switch which on its manual setting, furnishes electric power directly to an electric motor coupled to a pump for pumping liquid from the sump to the overhead tank a control board to which the said switch on its auto setting, supplies e1ec talc power through a transformer! two sets of probes provided for the sump and the over head tank respectively each set including a lower probe, an upper probe and a common probe„ said probes of the sets being connected to the control board! ^ relay connected to the output of the control board and to the said motor, whereby whenever the liquid in the sump reaches the level of the lower said probe senses the liquid level to trigger the control board to de-energies the relay, to switch off the motor and whenever the liquid in the overhead tank either reaches the level of the upper probe or the level of the lower probe,, the concerned probe senses the liquid level, to trigger the control board and

either de~energlse or energise the relay to switch off or switch on the motors a dry sensing probe for triggering the control board to de-energise the relay and switch off the motor^ whenever no liquid emerges from the delivery line of the pump over a predetermined interval of time; and audio and / or visual indication means which are activated by the control board, whenever triggered by the dry sensing probe-
2»A device as claimed in Claim 1 wherein the switch is a three way toggle switch^ with a manual switching position an off position and am auto position.
3.A device for control ling the level of a liquid in an overhead tank substantially as herein described with reference top and as illustrated in, the accompanying drawings.


Documents:

878-mas-1997-abstract.pdf

878-mas-1997-claims filed.pdf

878-mas-1997-claims granted.pdf

878-mas-1997-correspondnece-others.pdf

878-mas-1997-correspondnece-po.pdf

878-mas-1997-description(complete)filed.pdf

878-mas-1997-description(complete)granted.pdf

878-mas-1997-drawings.pdf

878-mas-1997-form 1.pdf

878-mas-1997-form 26.pdf

878-mas-1997-other documents.pdf

abs-878-mas-1997-1.jpg

abs-878-mas-1997-2.jpg


Patent Number 213902
Indian Patent Application Number 878/MAS/1997
PG Journal Number 13/2008
Publication Date 31-Mar-2008
Grant Date 23-Jan-2008
Date of Filing 28-Apr-1997
Name of Patentee V-GUARD INDUSTRIES LIMITED
Applicant Address LITTLE FLOWER CHURCH ROAD, KALOOR, COCHIN 682017,
Inventors:
# Inventor's Name Inventor's Address
1 CHITTILAPPALLY THOMAS KOCHOUSEPH V-GUARD INDUSTRIES LIMITED, LITTLE FLOWE CHURCH ROAD, KALOOR, COCHIN 682017,
PCT International Classification Number F01 M 11/06
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA