WO2009153799A1

WO2009153799A1 - Engineered ozone system for indoor air quality improvement

Info

Publication number: WO2009153799A1
Application number: PCT/IN2008/000382
Authority: WO
Inventors: Vishal Waindeskar
Original assignee: Vishal Waindeskar
Priority date: 2008-06-18
Filing date: 2008-06-18
Publication date: 2009-12-23

Abstract

Very low density ozone is generated by corona discharge on dual side of ceramic plate (dielectric medium) with mesh on both the side of ceramic plate contained in the stainless steel box which is duct mounted in HVAC ducts by applying control voltage & low frequency not exceeding 50 Hz over both sides of ceramic ozone plates for overall reduction of VOC in occupied spaces in indoor air quality. The air flow over the ceramic plates will be horizontal & vertical. So for generation of ozone no extra air preparation is required. Voltage to the ozone plates is varied in accordance with the VOC in occupied space to maintain the VOC at the minimum level. Safety measures for high ozone & VOC sensor cable breakage protection is considered with AHU fen interlock.

Description

Title: "ENGINEERED OZONE SYSTEM FOR INDOOR AIR QUALITY IMPROVEMENT".

Field of invention:

This invention relates to air purifier systems. More particularly this invention relates to the indoor air quality improvement system having ozone generators.

Background of Invention:

Ozone is a powerful oxidizing agent that can react with long molecules that are characteristic of odor that the human nose can detect, thus neutralizing these long molecules by breaking them up into "shorter" molecules, and the order is "purified".

Ozone is a word that is derived from the Greek word "smell". It is more commonly known in air purification as "Activated Oxygen". Ozone occurs when a discharge, such as Lightning bolt or water fall, then molecularly disassociates a stable molecule (02) and splits them apart leaving two atoms that are unstable, i.e.. (01) oxygen. The three atoms are unstable and now seek to be stable, in order to be stable they connect to surrounding oxygen molecules (01) thus creating ozone (03).

Ozone is used to oxidize many odors in the home and odors such as Cooking Odors, Pet Odors, Garbage Odors, Cigarette Smoke Odors, Mildew Basement Odors, etc.

Comparison with Prior Art:

In the existing system as given in United States Patent 6726885 document wherein apparatus and method for ozone generation and a method for generating ozone by exposing oxygen to high frequency alternating current with high voltage over a dielectric is described. The apparatus comprises a pressure compensation admitting unit joined together by at least two plates of a dielectric material and there between a present electrode on which high frequency alternating current with high voltage is applicable, and two sealed spaces for generation of ozone on opposite sides of the unit, whereby the respective sealed space, on the opposite side of said plate of dielectric material, is delimited by an earthed and cooled electrode, through which oxygen gas or gas rich in oxygen is supplied to the space and ozone is conducted out of the same. By means of this apparatus, oxygen gas or gas rich in oxygen can be conducted under pressure into sealed chambers on opposite sides of the pressure compensation admitting unit. However in our invented system , We are not using any particular feed gas as oxygen where as In our system we are only using the ambient oxygen available in the air flow through ducts to produce ozone. Also, we are using line frequency i.e. 50 Hz, no modulation of frequency in our case. And no pressure compensation unit is required; we are using the system pressure.

In another existing system as given in United States Patent 5417936 document which is related to a plate-type ozone generator having a discharge cell including a box-shaped casing formed by using a dielectric of a quartz containing silicon dioxide having a purity of not less than 99.9%, a discharging gap defined by the interior of the casing, and a flow passage for a material gas defined in the discharging gap by a partition made of a quartz. A material gas inlet section and an ozone outlet section are provided on the discharge cell for communicating with the discharging gap. Each section has a quartz tube and a stainless steel tube joined together by a fused joint made of a covar glass and a covar alloy. The ozone generator does not employ a gasket made of an organic compound or the like, and is capable of stably generating high-concentration high-purity ozone for a long period of time without the risk of leakage.

However, in our invented system, no particular discharge is being used to generate ozone., no quartz containing silicon dioxide is being used in our system we are using ceramic as a dielectric. Also, no discharge gap is defined in our system and there is no gas inlet or outlet sections for ozone are defined. In our system ozone is generated by flow of air in any direction over ceramic ozone plates.

In another existing system as given in United States Patent 5211919 document, a flat plate corona cell for generating ozone with a generally convergent radial gas flow is desribed. The net gas flow direction through the corona gap is from the outer edges of the cell inward towards an exit port in the approximate center of the cell. This eliminates parasitic arcing at the perimeter, greatly increases the life of the perimeter seal, and provides a homogenous gas flow which increases ozone output. The cell design allows both electrodes to be operated at high voltage, therefore reducing the effective kilovolts with respect to ground by half. However in our invented system , though the flat plate is being used in our system but the flow multidirectional there is no convergent radial gas flow. The net gas / air flow will not be 100% through or over the plates. Part of the total air flow; flowing in the HVAC duct will pass over ozone plate to produce low density corona discharge ozone. Also, Irrespective of the flow over ozone plates the generation of ozone remains constant. And Our system does not use any kind of perimeter seal.

In another existing system as given in United States Patent 5,573,730 document related to a method and apparatus for treating airborne residues wherein An ozone generator is disclosed in which ozone production is controlled through corona voltage and airflow. The ozone from the generator converts perchloroethylene vapor in dry cleaning effluents into environmentally acceptable compounds. Ozone generation is controlled in response to the perchloroethylene vapor concentration in the mixture that is discharged from a mixing chamber in the apparatus. Other features include an inflatable retention chamber for allowing the ozone and perchloroethylene reaction to go to completion and improved means for cleaning the glass plates in the ozone generator by sliding the plates out of the generator structure. In this system the method described is particularly for oxidation of perchloroethylene. However, in our invented our system is particularly designed for overall reduction of VOC (volatile organic carbon) in centralized air conditioned system. Also , there is no retention chamber in our apparatus/system. And We are using ceramic plates not glass plates. We are controlling the ozone generation by VOC sensor readings which will be different for different indoor application like viz. Malls, restaurant, bar. For each case VOC & ozone generation will differ. Also we are not allowing the ozone level to cross the OSHA (Occupational safety & health assessment ) limit. The ozone generator will stop generation of ozone once the set point of ozone in sensor is reached & once again will restart once the ozone is depleted by consumption of VOC .

Summary of the Invention:

This invention is related to Indoor Air Quality treatement system wherein Very low density ozone is generated by corona discharge on dual side of ceramic plate (dielectric medium) with mesh on both the side of ceramic plate contained in the stainless steel box which is duct mounted in HVAC ducts by applying control voltage & low frequency not exceeding 50 Hz over both sides of ceramic ozone plates for overall reduction of VOC in occupied spaces in indoor air quality. The air flow over the ceramic plates will be horizontal & vertical. So for generation of ozone no extra air preparation is required. Voltage to the ozone plates is varied in accordance with the VOC in occupied space to maintain the VOC at the minimum level. Safety measures for high ozone & VOC sensor cable breakage protection is considered with AHU fan interlock.

The Plate type ozone Generators are provided with the primary aim of achieving reduction in Volatile Organic Compounds (VOC), hydro carbon gases, and organic odors, in Indoor Environment. They also serve purpose of depleting and inhibiting growth and propagation of microbial organisms and micro flora, commonly found in indoor environments, HVAC ducts, cooling coils and on air filters. VOC reduction is achieved by oxidation of VOC by ozone. Depletion of microbial colonies is achieved by inhibiting their growth and propagation.

Brief description of drawings:

Fig.l illustrates OZONE GENERATORS - Plate type, low density corona discharge. Fig.2 illustrates VOC SENSOR, CONTROLLER

Fig.3 illustrates INTELLIGENT GENERATOR CONTROLLER- GUIDOZONE

Fig.4 illustrates OZONE CONCENTRATION SENSOR, MONITOR AND CUTOUT SWITCH WITH TEMPERATURE / HUMIDITY DETECTION

Fig.5 illustrates CO2 monitor / controller Fig 6 illustrates Control block diagram Fig 7 illustrates V/F control and setting Fig 8 illustrates terminal wiring

Specifications of "GUIDOZON" with, auto VOC / C02 controllers and ozone monitors cum cut out switch.

IAQ treatment with ozone; the system has following components:

1. Plate type Ozone generator

2. VOC sensor, controller.

3. Intelligent generator controller - GUIDOZON

4. Ozone concentration sensor, monitor and cutout switch with temperature/humidity detection

5. C02 monitor / controller (optional) & damper.

.0 OZONE GENERATORS - Plate type, low density corona discharge.

1a) Plate type ozone Generators are provided with the primary aim of achieving reduction in Volatile Organic Compounds (VOC), hydro carbon gases, and organic odors, in Indoor Environment. They also serve purpose of propagation of microbial organisms and micro flora, commonly found in indoor environments, HVAC ducts, cooling coils and on air filters. VOC reduction is achieved by oxidation of VOC by ozone. Depletion of microbial colonies is achieved by inhibiting their growth and propagation.

1b) The aim is to ensure the VOC are kept below the TLV (Threshold Limit Value) for occupied areas, as recommended by OSHA.

1 c) The maximum residual concentration of ozone in the indoor environment will never allowed to exceed 50 PPB (v/v). PPB is Parts per Billion.

1d) Ozone Generators shall be provided where called for, with number of corona discharge plates as listed in the schedules.

1 e) These plate type Ozone Generators shall be compact, self contained units in SS316 L with all components factory mounted in one neat, compact package. The 'VRS¹ type to be mounted inside the duct. 1f) Parts of the generators in contact with air stream are kept to as minimum as required. 1g) Components in contact with air stream are enclosed in stainless steel casing 18 G SS316L thick, with sufficient stamped integral openings to allow adequate flow of air over the corona discharge plates. 1 h) The generator plates shall be mounted on generator head fabricated out of materials that repel accumulation and formation of sediments by tar, nicotine and grease. This is an extremely important prerequisite to enhance the operational reliability and ease of maintenance of the generator plates. 1 i) The generators are suitable for mounting in ducts with air flow in horizontal, vertical or angular directions. 1j) The generator operates effectively with air flow in either direction that is left to right or vice versa in horizontal ducts, and top to bottom or vice versa in vertical ducts. 1 k) Generators can be electrically interlocked with motor of the air handling unit fan. This will prevent start of the generator unless the fan motor is energized. 11) Generator is mounted inside the ducts. It will be provided with flange suitable for mounting on a metal frame, to be installed inside the duct. 1 m) Openings in the ducts are made with sheet metal shears or cutters. Metal saw or grinding machine shall not be used, except to make an initial cut to permit use of metal shear. This precaution is taken to prevent metal debris from falling into the ducts. n) When mounted on the supply air duct, it is importantly ensured that the chosen location does not have carry over moisture from cooling coil or humidifier, or any other moisture emitting device. o) Care is taken to ensure the generator is mounted on a straight run of duct with steady flow of air. Installation on bends, elbows, transition pieces, or close to dampers is not recommended. p) Generation of ozone is only by principles of corona discharge. Multiple numbers of corona discharge plates used to provide the necessary quantity of ozone. All the corona discharge plates shall be housed \n one common stainless steel enclosure. q) Only multiple plate type corona surfaces shall be used for ozone generation.

Production density of ozone per sq inch (or sq cm) of surface area of corona surface shall be as low as possible. Rate of variation of production of ozone shall foHow approximately the rate of variation of VOC in the indoor environment This is in view to ensure residual tevei of ozone in the indoorr) environment remains low while ensuring residual VOC level also remains low. s) Annual type of corona or corona mounted outside the air stream with ozone tubed to the duct shall not be used-t) Ozone and VOC is detected in the same gaseous stream, and ozone production is in this stream. To ensure this, ozone generator is of duct mounted type. Portable type generators that produce ozone outside the

HVAC air stream are not acceptable in IAQ treatment u) Ozone generator does not require any consumable for its operation, except for use of electricity. v) The system does not rely on initial or replacement of filters of any sort to remove odors and chemicals. w) The ozone generators are capable of operating on 220 to 240 Volts, single phase power supply, 50 Hz. They are properly grounded. Ease of maintenance is important consideration. They are manufactured to permit easy withdrawals and refitting on the ducts, with minimum use of tools of hardware to remove or refit the generators to the ducts.

SENSOR MODULE:

IAQ is a comprehensive index, including room temperature; humidity, fresh air, and diverse low concentrations air contaminants. Monitoring IAQ is very important to guarantee healthy life and work.

TVOC is specially used to detect indoor air quality in occupied spaces.

TVOC controller provides RS485 network interface and independent base address to PC or other control system, so each room of the whote ventilating system can be managed and controfted intelligently.

• Ambience air quality detection and alert

• Ventilation control

• Air quality monitors

• Odor monitors.

2a) Regulation of IAQ device is automatically controlled by Auto TVOC Sensor and Microprocessor based Intelligent Generator Controller.

2b) Sensor and Controller rs rated for continuous operation.

2c) Sensor is suitable for mounting \n space, duct, plenum, or process chamber. If not space mounted, it can be provided with Air Aspiration enclosure (Optional) Sampling air can be aspirated to the enclosure and released.

2ό) The Sensor is factory calibrated to lsobutylene gas 100 PPM for full span and controlled dean air for zero span. Factory stamped calibration certificate with date of calibration shall be provided with each Sensor if required.

2e) The TVOC Sensor is capable of detecting broad range of commonly occurring TVOC in indoor applications. Each gas sensed is related by the sensor to its corresponding concentration value to isobutylene.

2f) The sensor provides linear signals, from Clean to High levels of concentration of the polluting TVOC. The Sensor has LCD displays to provide visual indicating for the TVOC levels. The sensor provides 0 to 10 VDC Linear output.

2g) In the event of power failure, or if the system is turned off_v the Sensor retains the pre- set sensitivity.

2h) Factory supplied interconnecting cable is provided, for communication between Sensor and Load Controller.

2i) Sensor controller is manufactured by Omniscient Treatment Technologies

Pvt Ltd, Nagpur, India or equivalent-

Features:

Real time monitoring ambience air quality with 0~30ppm complex detection range. LCD displaying air contaminants with temperature and humidity (optional) at the same time.

Also as the controller of IAQ including temperature and humidity (optional).

Locale adjustable JAQ: 0~30ppm; Temperature: 5~45 Deg Centigrade ;

Humidity:5 to 95%RH

RS-485 communication interface, 15KV antistatic protection, independent base address setting.

Semiconductor sensor inside, 5~7 years tang We Low power consumption

Microprocessor control with quickly response.

Providing IxCMOV analog output and up to Ixrelay dry-contact outputs.

Analog output with two alternatives: linear zed over full range output or PID control output

The relays can be selected to control IAQ, temperature or humidity

(programmable setting).

Timers of tumtπg-off function from 0.5 to 12 hours for the auxrftary (optional).

Specifications:

*

.0 MICROPROCESSOR BASED INTELLIGENT GENERATOR CONTROLLER- GUIDOZONE

3a) Controller is solid state, mounted in rugged stainless steei enclosure in

SS316L 3b) It is fully factory assembled. Field provided connections are limited to power wiring. 3c) The Controller is suitable for accepting signals from the Sensor Based on the signals received, it provides variable output to operate IAQ devices. 3d) Input voltage to controller is 220 to 240 Volts, 1 Ph, 50 Hz (Factory set). It is suitable for toad rating of 10 Amps. 3e) Controller is provided with terminal block to connect incoming power, variabte outgoing power, and for interlock to AHU motor or other air moving device, and to safety device such as high ozone cut out switch. 3f) The Controller is provided with receptacle to accept easy plug in cable connector, for communication to Sensor. 3g) Controller is provided with rocker switch to choose Automatic or Manual

Mode of operation. In the Manual Bypass Mode, voltage output of the

Controller shall be 100% of input voltage, regardless of the level of VOC. 3h) Cable connector between Controller and Sensor, length not less than 25ft

(7.5 M) is factory provided. This is complete with cables to provide power to

Sensor and transfer signals for the different levels of VOC from Sensor to

Controller, 3i) Controfter is manufactured by Omniscient Treatment Technologies (I) Pvt.

Ltd., Nagpur, tndia. 3j) Output Voltage from the controller to generator is linear; Output can be controlled precisely with respect of sensor input 3k) Controller should have extra input for interlocking of any auxiliary device to be added in future.

31) Controller accepts both signals 0-1 OV DC and 4-2OmA. 3m) Controller has at least one programmable relay output contact for faults such as overload, over voltage trip, fow voltage trip, sensor fault 3n) Controller is facilitated to add more ozone generators & sensors.

4a) Ozone concentration monitor cum sensor is provided for the occupied areas. At feast one Monitor/Sensor is provided for generators in the AHU serving the area. 4b) The monitor shafl be installed in a side stream duct and not in the main duct.

This is to ensure the sensor efement is not exposed to high velocity of air found typicatty in aft HVAC ducts. This ensures accuracy of sensor readings, and prolongs life of the sensor element 4c) The sensor, monitor and a!! components is mounted in one neat and compact case, suitable for wafl mounting. 4d) The monitor shall have electrical leads to provide an open contact In the event concentration of ozone reaches the set alarm value, 'Normally Open' changes to 'Normally Close' position. This will be used to electrically cut out the ozone generator, when concentration reaches the set value. 4e) Additionally, if required it can also be provided an audible alarm, which is activated if the concentration reaches the set level. Switch shall be provided on the case of the monitor, to turn off the alarm, at the option of the user. 4f) The alarm can be factory set at 50 PPB. However, it shall be possible to change this setting in the field to any desired level & also be locked programmable so as to safeguard the system. 4g) The monitor provides a linear 0 to 10 Votts DC output voltage, proportional to concentration of ozone. This wiN be interfaced with the BMS to record continuously concentration in PPB or PPM, and also to produce hard copy printouts. This will also enable shutting down the ozone generators through the BMS, if the set high level is reached. 4h) The monitor is capable of interfacing with BMS. Necessary transponders to enable this will be provided by others. 4i) It is also possible to set the high ozone cut out level through the BMS, and to shut down the ozone generators through BMS, in the event the set alarm is reached; If required.

4j) The monitor is suitable for continuous operation. 4k) Input power source is 24 volts, DC, provided. Suitable adaptor for this is provided with the Monitor. 4I) Sensor controller is manufactured by Omniscient Treatment Technologies

(I) Pvt Ltd., Nagpur, India.

FEATURES:

• Real time detecting ozone gas, wide detection range.

• Real time detecting temperature also

• Humidity detection can be selectable

• Wall mount with LCD display Measured range ozone: 1 Qppb~100Oppb; temperature:5~45 Deg. Centigrade ; humidity:5~95%RH

Sensor shall be semiconductor base, should have high sensitivity to ozone gas, Sensor shall detect ozone gas, temperature & numϊdity in occupied spaces.

Provide an analog output with a linear over full range output

Low power consumption

Microprocessor control with quick response

Shall have 1X relay dry-contact output for an ozone generator.

Providing IXanafog output (0-1 OVDC) to correspond with ozone level( also as a transmitter )

RS-485 communication interface to PC or other DDC/BMS, 15KV antistatic protection, independent base address setting

SPECIFICATIONS:

Application:

C02 is used to monitor and control CO2 concentration in occupied spaces as well as room temperature and humidity, providing one 0-1 OVDC analog output and One dry contact output. It can be as a programmable logical controller to control CO2 level, temperature or humidity, and also as a transmitter to other device, DDC/PLC controller or other automation system. It provides RS485 communication with independent address to PC or other control systems.

Features:

• Wall mounted, LCD display, real-time detecting CO2 concentration, temperature and %RH (humidity detection is optional)

• Infrared CO2 sensor inside and supply three detection range to select for almost all application.

• 15 years lifetime of CO2 sensor

• Should also work as transmitter of COZ or as the controffer of CO2, temperature and humidity

• Microprocessor control, quick response, high precision.

• Analog output with two alternatives : linearized over full range output or PID control output

• Locale adjustable range CO2: 0 to 20,000 ppm or 0 to 50,000 ; Temperature: 5 to 45 deg. Cen. Humidity 5 to 95 % RH.

• Should have ABC Logic with patented Self Calibration Algorithm to make end users use it for 15 years without calibration amending. That is suitable for where concentrations will drop to outside ambient conditions (about 400ppm) at least 3 times in a 14 day period

• RS-485 communication interface, 15KV antistatic protection, independent base address setting

• Sensor Controller is manufactured by Omniscient Treatment Technologies (I) Pvt. Ltd., Nagpur, India.

Specifications:

PWM: Pulse width modulation output waveform of controller which is directly connected to transformer.

Accel/Decel is Acceleration time/Deceleration time :- It is the time taken to reach the full output voltage & Deceleration time is time taken to reach 0 voltage from full output voltage, These is used for smooth starting & stopping of generator.

Terminal wiring refers to the connection of controller with external inputs such as VOC Controller, Ozone sensor, Transformer etc.

Internal architecture of other components like 1. Plate type Ozone generator

2. VOC sensor, controller.

3. Intelligent generator controller - GUlDOZON

5. C02 monitor / controller (optional) & damper.)

Detail description of the invention:

IAQ (Indoor Air Quality) treatment with ozone wherein the system has following components:

1. Plate type Ozone generator

2. VOC sensor, controller.

3. Intelligent generator controller - GUIDOZOM

5. C02 monitor / controller (optional) & damper.

Claims

I Claim:Claim (1 ). The system for IAQ (Indoor Air Quality Jtreatmeπt with ozone capable of reducing the Volatile Organic Compounds (VOC), hydro carbon gases, and organic odors, in Indoor Environment and depleting and inhibiting growth and propagation of microbial organisms and micro flora, commonly found in indoor environments, HVAC ducts, cooling coils and on air filters, said system comprising of :

1. Plate type Ozone generator

2. VOC sensor, controller.

3. Intelligent generator controller - GUiDOZON

5. C02 monitor / controller (optional) & damper

Claim (2). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 wherein the VOC reduction is achieved by oxidation of VOC by ozone.

Claim (3). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 wherein the Depletion of microbial colonies is achieved by inhibiting their growth and propagation.

Claim (4). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 wherein the ozone generator plates are mounted on generator head fabricated out of materials that repel accumulation and formation of sediments by tar, nicotine and grease.

Claim (5). The system for JAQ (Indoor Air QυaVrty) treatment with ozone as claimed in claim-1 wherein the parts of the ozone generators in contact with air stream are kept to as minimum as required.

Claim (6). The system for IAQ (Indoor Air Quality )treatment with ozone as claimed in claim-1 wherein the ozone generators are suitable for mounting in ducts with air flow in horizontal, vertical or angular directions.

Claim (7). The system for IAQ (Indoor Air Quality )treatment with ozone wherein the plate type Ozone Generators are compact, self contained units in SS316 L with all components factory mounted in one neat, compact package i.e. the 'VRS' type to be mounted inside the duct.

Claim (8). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 wherein the components of ozone generators in contact with air stream are enclosed in stainless steel casing 18 G SS316L thick, with sufficient stamped integral openings tα allow adequate flow of air over tfte corona discharge plates.

Claim (9). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 wherein the said ozone generator operates effectively with air flow in either direction that is left to right or vice versa in horizontal ducts and top to bottom or vice versa in vertical ducts.

Claim (10). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 wherein the said ozone generator is having multiple numbers of corona discharge plates used to provide the necessary quantity of ozone.

Claim (11). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 wherein the said ozone generator is mounted on a straight run of duct with steady flow of air.

Claim (12). The system for IAQ (Indoor Air Quality )treatment with ozone as claimed in claim-1 wherein the said ozone generator is electrically interlocked with motor of the air handling unit fan to prevent start of the ozone generator unless the fan motor is energized.

Claim (13). The system for IAQ (Indoor Air Quality )treatmeπt with ozone as claimed in claim-1 wherein the said VOC controller provides RS485 network interface and independent base address to PC or other control system, so each room of the whole ventilating system can be managed and controlled intelligently.

Claim (14). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 wherein the said VOC Sensor is factory calibrated to lsobutylene gas 100 PPM for full span and controlled clean air for zero span. Claim (15). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 wherein the said VOC Sensor is suitable for mounting in space, duct, plenum, or process chamber-

Claim (16). The system for IAQ (Indoor Air Quality )treatment with ozone as claimed in claim-1 wherein the said VOC Sensor is capable of detecting broad range of commonly occurring VOC in indoor applications and each gas sensed is related by the sensor to its corresponding concentration value to isobutylene.

Claim (17). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 wherein the said VOC Sensor provides linear signals, from Clean to High levels of concentration of the polluting VOC. Claim (18). The system for IAQ (Indoor Air Quality )treatment with ozone as claimed in claim-1 wherein the said VOC Sensor has LCD displays to provide visual indicating for the VOC levels from 0 to 10 VDC Linear output.

Claim (19). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 wherein the said Intelligent generator eoπtroller is suitable for accepting signals from the Sensor and based on the signals received, it provides variable output to operate IAQ devices.

Claim (20). The system for IAQ (indoor Air Quality )treatment with ozone as claimed in claim-1 wherein the said Ozone concentration monitor have electrical leads to provide an open contact and ϊn the event concentration of ozone reaches the set alarm value, 'Normatty Operf changes to 'Normally Close' position to electrically cut out the ozone generator, when concentration reaches the set value.

Claim (21). The system for IAQ (Indoor Air Quality) treatment with ozone as claimed in claim-1 to 20 and as described herein with reference to the accompanying drawings.