Title of Invention

A DEVICE FOR THE MEASUREMENT OF RESIDUAL CHLORINE USED AS A DISINFECTANT IN DRINKING WATER

Abstract A device for the measurement of residual chlorine used as a disinfectant in drinking water comprising a programmed microcontroller; a chamber provided with first, second and third valve means; said first valve means being operable by the microcontroller for introducing a predetermined quantity of a chlorine detecting chemical reagent into the chamber; said second valve means being operable by the microcontroller for allowing a predetermined quantity of the drinking water into the chamber to mix with the said chemical reagent in the chamber and thus colour the said drinking water to indicate the quantity of the chlorine present in the water; a light source for passing light through the coloured water in the chamber through entiy and exit windows provided on either side of the chamber; a spectrum analyser activated by the microcontroller to read and interpret the colour of the light emerging at the exit window and thereby display the quantity of chlorine present in the water in ppm (parts per million) on a digital display; and the said third valve means being operable by the microcontroller for draining off the coloured water in the chamber thereafter.
Full Text

This invention relates to a device for the measurement of residual chlorine used as a disinfectant in drinking water in water processing plants. The device is of low manufacturing and operational cost and capable of quick and easy implementation.
Chlorine monitoring systems known to the art are usually based on the use of electrochemical probes, whereas this invention is based on the measurement of residual chlorine absorption (colour) spectrum.
Conveniently, the device proposed herein will be connected to the treated water outlet of drinking water processing plants for determining the quantity of residual chlorine content. Once the quantity of residual chlorine is determined, the chlorine content can be controlled to lie within prescribed norms, by the use of known standard apparatus, to avoid any harm to the human body.
The device proposed herein will now be described with reference to the accompanying drawings which illustrate in
Fig. 1 a chart indicating residual chlorine absorption spectrum (color) and related presence of chlorine in ppm (parts per million)
Fig. 2, by way of example and not by way of limitation, a general layout of the embodiment.

A programmed micro controller M electrically operates solenoid valve S2 to open (keeping the other two electrically operable solenoid valves SI and S3 closed) for introducing a predetermined quantity of drinking water from the outlet of a water processing plant into a chamber C. The quantity of water is predetermined by a level detector LD which activates the solenoid valve S2 to shut off further ingress of water into the chamber on the predetermined level within the chamber being reached.
The micocontroller M then activates the solenoid valve S3 to allow the water in the chamber to drain out completely, thus cleaning the chamber C for carrying out the residual chlorine measurement operation.
Next, the microcontroller M keeping the solenoid valves S2 and S3 closed, opens the solenoid valve SI to allow a measured quantity of the chemical reagent into the chamber C. Thereafter, keeping solenoid valves SI and S3 closed, the microcontroller M opens the solenoid valve S2 to allow drinking water from the outlet of the water processing plant, into the chamber C until the entry of water is limited to a predetermined quantity by the level detector LD, which then closes the solenoid valve S2. The water thus introduced into the chamber, mixing with the said reagent, now acquires a colour of a shade corresponding to the percentage of chlorine present in the water.
Next, the microcontroller M switches on a light source L for passing light through the coloured water in the chamber

through entry and exit quartz windows W provided on either side of the chamber, allowing the spectrum analyzer, 5/\ activated by the microcontroller, to read and interpret the colour of the light emerging at the exit window and thereby display the quantity of chlorine present in the water in ppm (parts per million) on a digital display.
Thereafter, the microcontroller opens the solenoid valve S3 to allow the test specimen of water in the chamber to drain off. The solenoid valve S3 is then closed by the microcontroller M and the solenoid valve S2 opened to allow fresh drinking water to fill the chamber to the level determined by the level detector LD hereafter the water is drained off by the microcontroller M by opening the solenoid valve S3 for washing the chamber including the quartz window W clean, thus keeping the chamber ready for the next measurement.
The terms and expressions herein which are of description and not of limitation, do not exclude any equivalents of the features illustrated and described but it is understood that various other embodiments are possible without departing from the scope and ambit of this invention.










We Claim:
1. A device for the measurement of residual chlorine used as a disinfectant in drinking water comprising a programmed microcontroller; a chamber provided with first, second and third valve means; said first valve means being operable by the microcontroller for introducing a predetermined quantity of a chlorine detecting chemical reagent into the chamber; said second valve means being operable by the microcontroller for allowing a predetermined quantity of the drinking water into the chamber to mix with the said chemical reagent in the chamber and thus colour the said drinking water to indicate the quantity of the chlorine present in the water; a light source for passing light through the coloured water in the chamber through entiy and exit windows provided on either side of the chamber; a spectrum analyser activated by the microcontroller to read and interpret the colour of the light emerging at the exit window and thereby display the quantity of chlorine present in the water in ppm (parts per million) on a digital display; and the said third valve means being operable by the microcontroller for draining off the coloured water in the chamber thereafter.
2.A device as claimed in Claim 1 wherein the quantity of water received in the chamber is predetermined by a level limiter which closes the second valve means when the level of the liquid in the chamber reaches a predetermined level.

3.A device as claimed in Claim 1 or Claim 2 wherein the valve means are solenoid valves.
4.A device as claimed in any one of the preceding Claims wherein the windows are made of quartz.
5. A device for the measurement of residual chlorine used as a disinfectant in drinking water substantially as herein described with reference to, and as illustrated in, the accompanying drawings.


Documents:

3098-che-2007-claims.pdf

3098-che-2007-correspondnece-others.pdf

3098-che-2007-description(complete).pdf

3098-che-2007-form 1.pdf

3098-che-2007-form 18.pdf

3098-che-2007-form 26.pdf


Patent Number 243383
Indian Patent Application Number 3098/CHE/2007
PG Journal Number 42/2010
Publication Date 15-Oct-2010
Grant Date 11-Oct-2010
Date of Filing 26-Dec-2007
Name of Patentee CENTRE FOR DEVELOPMENT OF ADVANCED COMPUTING
Applicant Address VELLAYAMBALAM, THIRUVANANTHAPURAM 695033, KERALA, INDIA.
Inventors:
# Inventor's Name Inventor's Address
1 GEORGE PEREIRA VELLAYAMBALAM, THIRUVANANTHAPURAM 695033, KERALA, INDIA.
2 VELAYUDHAN PILLAI MURALIDHARAN CENTRE FOR DEVELOPMENT OF ADVANCED COMPUTING VELLAYAMBALAM, THIRUVANANTHAPURAM 695033, KERALA, INDIA.
3 SAMUEL NADAR ROMINUS VALSALAM CENTRE FOR DEVELOPMENT OF ADVANCED COMPUTING VELLAYAMBALAM, THIRUVANANTHAPURAM 695033, KERALA, INDIA.
4 SARAJ MURALEEDHARAN CENTRE FOR DEVELOPMENT OF ADVANCED COMPUTING VELLAYAMBALAM, THIRUVANANTHAPURAM 695033, KERALA, INDIA.
PCT International Classification Number G01N 27/26
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA