DESC:FIELD OF INVENTION
The present invention relates to a portable and IoT enabled multi-parameter water quality analyser. Particularly, the present invention relates to an apparatus and method for performing analysis of water for multiple parameters that include pH, conductivity, turbidity, concentration of pollutants (chemical elements) and temperature. More particularly, the present invention is an optical and ion selective electrode based measurement analyser to determine the concentration of essential analytical parameters as well as the turbidity of a water sample for Laboratory and field use.

BACKGROUND OF INVENTION
Water is essential for human survival. Drinking water is generally derived from both groundwater and surface water, making water monitoring a critical concern for ensuring access to potable water. Modernization in major areas and urban cities with concentrated human activity is currently causing significant water contamination, which is regarded one of the most serious environmental issues. As a result, it is essential to monitor and detect pollutants in water. There is a need for portable water quality testing devices that can analyse the essential key parameters. On-the-spot to assess the drinking water quality refers to the chemical, physical, and biological properties of water.

A range of products are currently used to monitor and measure water quality parameters such as pH, turbidity, EC-TDS, temperature and essential elements. Current products can only determine a limited number of water quality criteria since they only have access to a limited number of sensors and techniques. Other products such as a fluorometer, colorimeter, and turbidity meter are used to measure limited key elements in water quality testing.

This forces the user to choose more products in order to determine the profile of the water quality, which is both time-consuming and costly. The main drawback of current commercial products is their inability to measure all critical key parameters with a single instrument for drinking water quality testing.

The main disadvantages of traditional methods are requiring too much manpower and material resources, time consuming, limitations of sample collecting, aging of experiment equipment, less reliable, lack of water quality information, no on field monitoring, and relatively high costs (labour, operation, and equipment). Other drawback of electrodes includes short life span, frequently replacement, fragile, and operational orientation.

US20140299471A1discloses a pH sensor of improved classical configuration comprising a reference electrode, halogen sensors, pH sensors, TDS sensors, and related methods, which more particularly to electrochemical sensors for measuring certain characteristics of aqueous liquids, and components of such sensors.

US5497091 describes a pH sensor that employs an antimony electrode in combination with a ceramic reference electrode, but provides no clear description of the ceramic reference electrode. However, known antimony-based pH sensors typically employ a polished antimony surface for enhanced sensitivity and so suffer from deteriorating sensitivity as they lose polish. In addition, known antimony-based pH sensors typically also suffer from substantial drift as the quality of the polish diminishes over time, and frequent recalibration and limited life time due to gradual dilution of the filling solution and similar with the other pH sensors dependent on ion exchange between the fluid being tested and the filling solution. Moreover, since they employ a liquid fill solution, they must be maintained in a vertical position. Thus, the state of the art reference electrodes for pH monitors are unsuitable for frequent, accurate, pH measurements with low drift especially those in which a durable, inexpensive and readily available (or easy to manufacture) probe.

Several types of electronic sensors are used in automated measurement systems. The most common is an oxidation reduction potential sensor, an example of which is discussed in US4224154. Said type of sensor employs an electrode that is most affected by cyanuric acid.

US3959087 teaches an electrode assembly wherein both electrodes comprise copper and wherein a buffer solution is not required between pH 5 and pH 9. However, this arrangement has been found to be very susceptible to the amount of chloride-based salt in the water.

US8094294B2 discloses apparatus and methods for assessing occurrence of a hazardous agent in a sample by performing multipoint analysis of the sample.

Antimony pH sensors use polycrystalline rod material with various methods used to seal the interface between the antimony and the sensor housing as disclosed in US4681116 and US3742594. However, these electrodes do not address the oxidation issues and also suffer from all the attendant difficulties associated with bare antimony.

Various solutions have been proposed to address the problem of electrode erosion and degradation. US4818.365 disclosed dip coated electrodes in a Nafion solution and cured and then annealed. It was found with respect to antimony that the coatings resulting from this process were not only highly variable regarding their pH response but also retained insufficient adhesion and uniformity to the metal surface.

US7276142B2 disclosed combination glass pH electrodes, the standard potential of which is stabilized by means of one or more of the structural modifications.

Based on the present investigation, the limits of existing commercial products, and traditional methodologies, there is potential to develop an advanced portable water quality monitoring device with features of autonomous, low cost, reliable and flexible for testing complete measurements of water quality essential parameters in the lab and in the field.

The present invention overcome the challenges of available instruments by disclosing a portable and affordable instrument for measuring all critical water quality parameters, as well as the transition from traditional manual to more technologically advanced methods.

Accordingly, there exists a need for a portable multi-parameter water quality analyser to overcome the afore-mentioned drawbacks.

OBJECTS OF INVENTION
One or more of the problems of the conventional prior art may be overcome by various embodiments of the system and method of the present invention.

It is the primary object of the present invention to provide a portable and IoT enabled water quality analyser that assesses critical water quality parameters on-the-spot without the usage of multiple products and overcoming the constraints of traditional methods.
It is another object of the present invention to provide a portable and IoT enabled multi-parameter water quality analyser that integrates multiple-techniques that include potentiometric, electro-conductivity, nephelometric and colorimetric to determine pH, conductivity, turbidity, concentration of chemical elements, and temperature as well as improved chemical methods and advanced network techniques.

It is another object of the present invention, wherein the portable multi-parameter water quality analyser by integrating data acquisition procedures, wireless communication, network architectures and power management schemes allows for monitoring, fast data transmission rates, data storage, alerts management, low power consumption and low maintenance.

SUMMARY OF INVENTION
Thus, according to the basic aspect of the present invention, there is provided a portable and IoT enabled multi-parameter water quality analyser, comprising of:
a single unit optical sensor module comprising of a colorimeter, and a turbidity module;
a composite electrode probe; and
a data processing unit,
wherein the colorimeter comprises of a white light LED source module to illuminate a test sample; an optical lens to collimate the light received from the LED source module; a filter wheel module; a sample module containing a test sample; a photodetector module for detecting the light passed through the test sample; and an optical lens for focusing light onto the photodetector module after said light passes through the filter wheel module and test sample,
wherein the turbidity module comprises of an infrared LED source; an optical lens for collimating the light received from the LED source; an orthogonal photodetector for measuring both transmitted and orthogonal scattered light; and the optical lens which collects and focus scattered light from sample path onto the photodetector,
wherein the composite electrode probe houses a pH electrode; an EC-TDS (Electrical Conductivity-Total Dissolved Solids) electrode; and a resistive temperature sensor for simultaneous measurement of pH, EC-TDS and temperature of the test sample,
wherein the data processing unit comprises of a signal conditioner and driver module; a user interface unit; a communication peripheral; and a battery module,
wherein the signal conditioner and driver module includes an analog circuit; an analog front end electronics circuitry; a MCU-1 (microcontroller unit) for processing of analytical parameters; a MCU-2 for communication peripherals; and a power supply unit,
wherein the data processing unit processes all the data received from the colorimeter, turbidity module, and composite electrode probe of the test sample and send to the MCU-2, and
wherein a Single-Board Computer (SBC) unit of the user interface unit sends command and receives data from the MCU-1 and MCU-2 and resultant data of the test sample is displayed on a display device.

It is another aspect of the present invention, wherein the filter wheel module supports multiple optical filters for selecting desired wavelength.

It is another aspect of the present invention, wherein the filter wheel module is connected to a geared stepper motor and an optical switch which are used to determine the homing position and filter wheel position for each test sample analysis.

It is another aspect of the present invention, wherein the sample module is used in both the colorimeter and turbidity module and it accommodates path length of 24mm for measuring the concentration of analytical parameters and turbidity of the test sample.

It is another aspect of the present invention, wherein the turbidity module measures turbidity within a range of 0-200 Nephelometric Turbidity Unit (NTU) with high resolution and accuracy and a 0-1000 NTU range with lower resolution and high accuracy.

It is another aspect of the present invention, wherein when the analyser is switched on, in the colorimeter,
the light from white light LED source module passes through the optical lens, optical filter and falls on the sample module,
the sample module absorbs some light and remaining light is sent to the photodetector module,
the photodetector module produces electrical output with respect to input light,
the photodetector output is transmitted to the data processing unit, said unit converts the analog to digital data and calculates the data as per requirement, and
the resultant data is displayed on the display device.

It is another aspect of the present invention, wherein when the analyser is switched on, in the turbidity module,
the light from the infrared LED source illuminates the sample module through the optical lens and the orthogonal photodetector measures both transmitted and orthogonal scattered light,
the photodetector signal is sent to the data processing unit, said unit converts the analog to digital data and calculates the data as per requirement, and
the resultant data is displayed on the display device.

It is another aspect of the present invention, wherein when the analyser is switched on, in the composite electrode probe,
the pH electrode; EC-TDS electrode; and resistive temperature sensor measures pH and electrical conductivity (EC-TDS) of a water sample simultaneously,
the pH and EC-TDS electrodes convert the pH and conductivity into electrical signals and sent to the data processing unit, said unit converts the analog to digital data and calculates the data as per requirement, and
the resultant data is displayed on the display device.

It is another aspect of the present invention, wherein the MCU-1 processes the data and controls the LED source, optical switch, optical filters, geared stepper motor, photodetector gain, and power supply unit and the MCU-2 transfers the data via communication peripherals.

It is another aspect of the present invention, wherein the portable and IoT enabled multi-parameter water quality analyser is configured with mode selection for analysing the test sample namely on-the-spot mode and in-the-laboratory mode, wherein in the on-the-spot mode selection, the analyser captures current geographic coordinates and is tagged with the water sample, wherein in-the-laboratory, the analyser reads sample from NFC tag, perform analysis using pre-programmed calibration and reagent methods, and analysis results are stored into local data storage.

It is another aspect of the present invention, wherein the analyser is configured to automatically upload the test sample analysis results to a cloud server along with the respective water sample profile, high sample’s data integrity, data transfer/export in Comma Separated Values (CSV) or a pre-defined format over Universal Serial Bus (USB), Wireless Fidelity (Wi-Fi), GSM and BLE interfaces.

It is another aspect of the present invention, wherein the portable and IoT enabled multi-parameter water quality analyser measures analytical parameters in the test sample that include pH, TDS, Turbidity, Chloride, Total Alkalinity, Total Hardness, Sulphate, Iron, Fluoride, Nitrate, Arsenic, Ammonia, Zinc, Lead, Cyanide, Copper, Chromium, Nickel, Cadmium, Manganese, Phosphate, Aluminium, Phenol, and Free Residual Chlorine.

BRIEF DESCRIPTION OF DRAWINGS
Figure 1: illustrates block diagram of portable multi-parameter water quality analyser according to the present invention.
Figure 2: illustrates ray geometry of optical sensor module of the portable multi-parameter water quality analyser according to the present invention.
Figure 3: illustrates cross sectional view of composite electrode probe of the portable multi-parameter water quality analyser according to the present invention.
Figure 4: illustrates electronics block diagram of the portable multi-parameter water quality analyser according to the present invention.
Figure 5: is a flow chart illustrating operating method of the portable multi-parameter water quality analyser according to the present invention.
Figure 6: illustrates structural representation of the portable multi-parameter water quality analyser according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO ACCOMPANYING DRAWINGS:
The invention as herein described relates to a simple, low-cost, portable and IoT enabled water quality analyser that assesses critical water quality parameters on the spot without the usage of multiple products and overcoming the constraints of traditional methods. The present invention is an optical and ion selective electrode based measurement analyser for determining the concentration of essential analytical parameters as well as the turbidity of a water sample for Laboratory and field use. The analyser by integrating data acquisition procedures, wireless communication, network architectures and power management schemes allows for monitoring, fast data transmission rates, data storage, alerts management, low power consumption and low maintenance. The present invention is advantageous over existing products in terms of cost, portability, and applicability.

Referring to Figure 1, the portable and IoT enabled multi-parameter water quality analyser [100] comprises of an optical sensor module [200]; a composite electrode probe [300]; and a data processing unit [400]. Referring to Figures 1 and 2, the optical sensor module [200] comprises of a colorimeter [220], and a turbidity module [240]. The optical sensor module [200] is a single unit cell for measuring colour and turbidity of test sample. The colorimeter [220] comprises of a white light LED source module [222] to illuminate a test sample; an optical lens [224a] to collimate the light received from the LED source module [222]; a filter wheel module [226]; a sample module [228] containing a test sample; and a photodetector module [230] for detecting the light passed through the test sample; an optical lens [224c] for focusing light onto the photodetector module [230] after it passes through the filter wheel module [226] and test sample, said filter wheel module [226] supports multiple optical filters for selecting desired wavelength. The filter wheel module [226] is connected to a geared stepper motor and an optical switch which are used to determine the homing position and filter wheel position for each sample analysis. One filter was chosen and held stationary during the test based on the target sample. Colorimeter is light-sensitive equipment that can be used to assess a test water sample's transmittance (%T), absorbance (Abs.), and concentration (mg/L).

The turbidity module [240] comprises of an infrared LED source [242]; an optical lens[224b] for collimating the light received from the LED source [242]; an orthogonal photodetector [230] for measuring both transmitted and orthogonal scattered light; and the optical lens [224c] which collects and focus scattered light from the sample path onto the photodetector [230]. In an aspect, 850nm infrared LED source is used to illuminate the test sample. The sample module [228] is used in both the colorimeter [220] and turbidity module [240] and it accommodates a path length of 24mm for measuring the concentration of analytical parameters and turbidity of a water sample. The turbidity module [240] is capable of measuring turbidity within a range of 0-200 Nephelometric Turbidity Unit (NTU) with high resolution and accuracy and a 0-1000 NTU range with lower resolution and high accuracy.

Referring to Figures 1 and 3, the composite electrode probe [300] houses a pH electrode [320]; an EC-TDS (Electrical Conductivity-Total Dissolved Solids) electrode [340]; and a resistive temperature sensor [360] for simultaneous measurement of pH, EC-TDS and temperature of a water sample. The composite electrode probe [300] is attached through a DIN connector.
In an embodiment, the pH electrode [320] is a general type of combination pH electrodes which consists of glass Hydrogen Ion (H+) sensitive electrode and an additional reference electrode (Ag/Agcl) all-in-one housing. The pH electrode [320] measures the amount of alkalinity and acidity in test water sample by measuring the difference in potentials between the two sides in the glass electrode. The EC-TDS electrode [340] measures electrical conductivity for determining the amount of total dissolved particles (TDS) and how well a medium conducts electricity (EC) in the test sample by employing two electrode probes. An analog circuit [422] is required for the interfacing of pH, EC-TDS, RTD sensor and analog to digital converter. The digital data is transmitted through Serial Peripheral Interface (SPI) and Fine Time Measurement (FTM) communication respectively.

Referring to Figures 1 and 4, the data processing unit [400] comprises of a signal conditioner and driver module [420]; a user interface unit [440]; a communication peripheral [460]; and a battery module [480]. Referring to Figure 4, the signal conditioner and driver module [420] comprises of an analog circuit [422]; an analog front end electronics circuitry [424]; an LED driver circuitry [426]; a photodiode analog front end electronics circuitry [428]; a filter wheel monitor circuitry [430]; a MCU-1 (microcontroller unit) [432] for processing of analytical parameters; a MCU-2 [434] for communication peripherals; and a power supply unit [436]. The analog front end circuitry [424] is an electrical conductivity (EC) and temperature sensor analog front end electronics circuitry. The signal conditioner and driver module [420] amplifies the analog signal and drive the current to the LED sources [222 and 242] and the filter wheel module [226]. The user interface unit [440] includes a Single-Board Computer (SBC) unit [442] for data transfer and analyser control and touch screen displays[444] and [502] with a keypad [504] for data processing and easy user interface; and an optional keypad [506] for selecting and performing required species analysis. The SBC unit [442] sends command and receives data from the MCU-1 [432] and MCU-2 [434]. The MCU-1 [432] processes the data and controls the LED source [222 and 242], optical switch, optical filters, geared stepper motor, photodetector gain, and power supply unit [436]. The MCU-2 [434] transfers the data via communication peripherals that include the touch screen displays [444], and [502] with a keypad [504] and higher-level communication peripherals [460] that include Near Field Communication (NFC) and Radio-Frequency Identifier (RFID) [462], Global System Module (GSM) and Global Position System (GPS) [464], Wi-Fi [466], Bluetooth Low Power Energy (BLE) [468], MCU-1 [432]and MCU-2 [434], and associated power supply unit [436]. The data processing unit [400] includes a data acquisition module which acts as an interface between the MCU-1[432] and analog signals. Said data acquisition module used to digitize the incoming analog signals and provide in readable form to the MCU-2 [434]. The battery module [480] includes a rechargeable battery [482] which is used to operate the analyser [100] in the field in the absence of electrical power; and a battery monitoring module [484] to monitor the status of the rechargeable battery [482].

The portable multi-parameter water quality analyser [100] is built with efficient application software that includes user interface for user friendly operations, high-level authentication services based on levels of user security, and an integrated workflow solution from samples collection to generating water quality report. Referring to Figure 5, a method of analyzing the essential key elements of a water sample is as follows: The analyser is switched on. The user log in and starts the application by selecting the targeted element. The user selects the mode. The mode includes on-the-spot mode and in-the-laboratory mode. In an aspect, if the on-the-spot mode is selected, the analyser captures the current geographic coordinates and is tagged with the water sample. In-the-laboratory mode, the analyser reads sample from NFC tag. The analysis is performed using pre-programmed calibration and reagent methods, and analysis results are stored into local data storage. The analyser is IoT enabled for automatically uploading the sample analysis results to a cloud server along with the respective water sample profile, high sample’s data integrity, data transfer/export in Comma Separated Values (CSV) or a pre-defined format over Universal Serial Bus (USB), Wireless Fidelity (Wi-Fi), GSM and BLE interfaces. The sample analyses results are printed in a pre-defined report format or sent vide Short Message Service (SMS) to a set of configured mobile numbers and effective surveillance. If for example, in-the-laboratory mode is selected, sample is created with Geo-tag, performs analysis using built-in pre-programmed calibration and reagent methods based on Novice mode or Profile mode, perform data measurements and data acquisition. In an aspect, GPS and NFC based module are used for Geo-tagging of the water sample. Geo-coordinates of the water sample location are acquired using GPS and the sample profile data with unique identity are stored into RFID chip tagged with a sample container. Using NFC reader, the stored data is retrieved from RFID chip and attached with the sample record. The sample analysis results are stored into local data storage. The analyser is IoT enabled for automatically uploading the sample analysis results to a cloud server along with the respective water sample profile, high sample’s data integrity, data transfer/export in Comma Separated Values (CSV) or a pre-defined format over USB, Wi-Fi, GSM and BLE interfaces. The sample analyses results are printed in a pre-defined report format or sent vide SMS to a set of configured mobile numbers and effective surveillance. The effective surveillance helps to detect and respond to the anomalous observations while analyzing water sample and thus avoids potential risk to public health. The portable multi-parameter water quality analyser uses pre-defined and user defined methods to measure the analytical essential parameters in the water that include pH, TDS, Turbidity, Chloride, Total Alkalinity, Total Hardness, Sulphate, Iron, Fluoride, Nitrate, Arsenic, Ammonia, Zinc, Lead, Cyanide, Copper, Chromium, Nickel, Cadmium, Manganese, Phosphate, Aluminium, Phenol, and Free Residual Chlorine.
Figure 6 illustrates the structural representation of the portable multi-parameter water quality analyser [100] that includes an enclosure [500] that provides waterproof and robust case for field use, communication ports that includes USB [508], GSM [510], GPS [512], a printer [514] for data communication and to print the resultant data, a charger port [516] for recharging the internal battery, an electrode connection port [520] for interfacing the combined electrode to the analyser, a power switch [518]to power the analyser.

Working of the portable multi-parameter water quality analyser:
In the colorimeter [200], the light from the white light LED source module [222] passes through the optical lens [224a], optical filter and falls on the test sample module [228]. The sample module [228] absorbs some light and remaining light is sent to the photodetector module [230]. The photodetector module [230] produces the electrical output with respect to input light. The photodetector signal is transmitted to the data processing unit [400]; said data processing unit [400] converts the analog to digital data and calculates the data as per requirement. The SBC unit [442] sends command and receives data from the MCU-1 [432] and MCU-2 [434] and the resultant data is displayed on the display device [444]. In the turbidity module [240], the light from the infrared LED source [242] illuminates the sample module [228] through the optical lens [224c] and the orthogonal photodetector [230] measures both transmitted and orthogonal scattered light. The photodetector signal is sent to the data processing unit [400]. Said data processing unit [400] converts the analog to digital data and calculates the data as per requirement. The SBC unit [442] sends command and receives data from the MCU-1 [432] and MCU-2 [434] and the resultant data is displayed on the display device [444]. Similarly, the pH electrode [320]; EC-TDS electrode [340]; and resistive temperature sensor [360] in the composite electrode probe [300] are used to measure pH and electrical conductivity (EC-TDS) of a water sample simultaneously. The pH and EC-TDS electrodes convert the pH and conductivity into electrical signals and sent to the data processing unit [400]. Said data processing unit [400] converts the analog to digital data and calculates the data as per requirement. The SBC unit [442] sends command and receives data from the MCU-1 [432] and MCU-2 [434] and the resultant data is displayed on the display device [444]. The data processing unit [400] processes all the data from the colorimeter [200], turbidity module [240], and composite electrode probe [300] and send to the communication peripherals. The SBC unit [442] sends command and receives data from the MCU-1 [432] and MCU-2 [434] and the resultant data is displayed on the display device [444].

Thus the integration of all the sensors into a single multi-parameter water quality analyser opens up new possibilities for analysing critical water quality parameters, and it has a great potential as a stand-alone tool for lab and field use across a wide range of water sources.
,CLAIMS:WE CLAIM:
1. A portable and IoT enabled multi-parameter water quality analyser [100], comprising of:
a single unit optical sensor module [200] comprising of a colorimeter [220], and a turbidity module [240];
a composite electrode probe [300]; and
a data processing unit [400],
wherein the colorimeter [220] comprises of a white light LED source module [222] to illuminate a test sample; an optical lens [224a] to collimate the light received from the LED source module [222]; a filter wheel module [226]; a sample module [228] containing a test sample; a photodetector module [230] for detecting the light passed through the test sample; and an optical lens [224c] for focusing light onto the photodetector module [230] after said light passes through the filter wheel module [226] and test sample,
wherein the turbidity module [240] comprises of an infrared LED source [242]; an optical lens [224b] for collimating the light received from the LED source [242]; an orthogonal photodetector [230] for measuring both transmitted and orthogonal scattered light; and the optical lens [224c] which collects and focus scattered light from sample path onto the photodetector [230],
wherein the composite electrode probe [300] houses a pH electrode [320]; an EC-TDS (Electrical Conductivity-Total Dissolved Solids) electrode [340]; and a resistive temperature sensor [360] for simultaneous measurement of pH, EC-TDS and temperature of the test sample,
wherein the data processing unit [400] comprises of a signal conditioner and driver module [420]; a user interface unit [440]; a communication peripheral [460]; and a battery module [480],
wherein the signal conditioner and driver module [420] includes an analog circuit [422]; an analog front end electronics circuitry [424]; a MCU-1 (microcontroller unit) [432] for processing of analytical parameters; a MCU-2 [434] for communication peripherals; and a power supply unit [436],
wherein the data processing unit [400] processes all the data received from the colorimeter [200], turbidity module [240], and composite electrode probe [300] of the test sample and send to the MCU-2 [434], and
wherein a Single-Board Computer (SBC) unit [442] of the user interface unit [440] sends command and receives data from the MCU-1 [432] and MCU-2 [434] and resultant data of the test sample is displayed on a display device [444].

2. The portable and IoT enabled multi-parameter water quality analyser [100] as claimed in claim 1, wherein the filter wheel module [226] supports multiple optical filters for selecting desired wavelength.

3. The portable and IoT enabled multi-parameter water quality analyser [100] as claimed in claim 2, wherein the filter wheel module [226] is connected to a geared stepper motor and an optical switch which are used to determine the homing position and filter wheel position for each test sample analysis.

4. The portable and IoT enabled multi-parameter water quality analyser [100] as claimed in claim 1, wherein the sample module [228] is used in both the colorimeter [220] and turbidity module [240] and it accommodates path length of 24mm for measuring the concentration of analytical parameters and turbidity of the test sample.

5. The portable and IoT enabled multi-parameter water quality analyser [100] as claimed in claim 1, wherein the turbidity module [240] measures turbidity within a range of 0-200 Nephelometric Turbidity Unit (NTU) with high resolution and accuracy and a 0-1000 NTU range with lower resolution and high accuracy.

6. The portable and IoT enabled multi-parameter water quality analyser [100] as claimed in claim 1, wherein when the analyser is switched on, in the colorimeter [200],
the light from white light LED source module [222] passes through the optical lens [224a], optical filter and falls on the sample module [228],
the sample module [228] absorbs some light and remaining light is sent to the photodetector module [230],
the photodetector module [230] produces electrical output with respect to input light,
the photodetector output is transmitted to the data processing unit [400], said unit [400] converts the analog to digital data and calculates the data as per requirement, and
the resultant data is displayed on the display device [444].

7. The portable and IoT enabled multi-parameter water quality analyser [100] as claimed in claim 1, wherein when the analyser is switched on, in the turbidity module [240],
the light from the infrared LED source [242] illuminates the sample module [228] through the optical lens [224b] and the orthogonal photodetector [230] measures both transmitted and orthogonal scattered light,
the photodetector signal is sent to the data processing unit [400], said unit [400] converts the analog to digital data and calculates the data as per requirement, and
the resultant data is displayed on the display device [444].

8. The portable and IoT enabled multi-parameter water quality analyser [100] as claimed in claim 1, wherein when the analyser is switched on, in the composite electrode probe [300],
the pH electrode [320]; EC-TDS electrode [340]; and resistive temperature sensor [360] measures pH and electrical conductivity (EC-TDS) of a water sample simultaneously,
the pH and EC-TDS electrodes convert the pH and conductivity into electrical signals and sent to the data processing unit [400], said unit [400] converts the analog to digital data and calculates the data as per requirement, and
the resultant data is displayed on the display device [444].

9. The portable and IoT enabled multi-parameter water quality analyser [100] as claimed in claim 1, wherein the MCU-1 [432] processes the data and controls the LED source [222 and 242], optical switch, optical filters, geared stepper motor, photodetector [230] gain, and power supply unit [436] and the MCU-2 [434] transfers the data via communication peripherals.

10. The portable and IoT enabled multi-parameter water quality analyser [100] as claimed in claim 1 is configured with mode selection for analysing the test sample namely on-the-spot mode and in-the-laboratory mode, wherein in the on-the-spot mode selection, the analyser captures current geographic coordinates and is tagged with the water sample, wherein in-the-laboratory mode, the analyser reads sample from NFC tag, perform analysis using pre-programmed calibration and reagent methods, and analysis results are stored into local data storage.

11. The portable and IoT enabled multi-parameter water quality analyser [100] as claimed in claim 10, wherein the analyser is configured to automatically upload the test sample analysis results to a cloud server along with the respective water sample profile, high sample’s data integrity, data transfer/export in Comma Separated Values (CSV) or a pre-defined format over Universal Serial Bus (USB), Wireless Fidelity (Wi-Fi), GSM and BLE interfaces.

12. The portable and IoT enabled multi-parameter water quality analyser [100] as claimed in claim 1 measures analytical parameters in the test sample that include pH, TDS, Turbidity, Chloride, Total Alkalinity, Total Hardness, Sulphate, Iron, Fluoride, Nitrate, Arsenic, Ammonia, Zinc, Lead, Cyanide, Copper, Chromium, Nickel, Cadmium, Manganese, Phosphate, Aluminium, Phenol, and Free Residual Chlorine.