POM, Personal Ozone Monitor, Serial #001 and
Contents
1. Personal Ozone Monitor Manual Rev D 412. Every analytical instrument is subject to some drift and variation in response making it necessary to periodically check the calibration Dynamic calibration is a multipoint check where gas samples of known concentrations are sampled by the instrument in order to determine a calibration relationship For more information on calibration of ozone monitors refer to the Code of Federal Regulations Title 40 Part 50 Appendix D and the EPA s Technical Assistance Document for the Calibration of Ambient Ozone Monitors Calibration is the process of adjusting the gain and offset of the Personal Ozone Monitor against some recognized standard The reliability of the data collected from any analytical instrument depends on the accuracy of the calibration which is largely dependent upon its analytical traceability to a reference material or reference instrument calibration Because of the instability of ozone the certification of ozone concentrations in a compressed gas cylinder is impossible due to loss of ozone over time When ozone concentration standards are required the ozone must be generated and certified on site The following are based on EPA requirements for calibrations of ozone monitors for monitoring in compliance with the Clean Air Act Similar procedures are recommended for other applications as well Ozone standards can be classified into two basic types 1 A Primary Ozone Standard is the combination of an ozone generator and an ozon
3. a few ppb can be corrected for by changing the offset calibration parameter Z from the front panel as described below 3 4 Collecting Data over the Serial Port in Real Time To transmit data to a computer over the serial port in real time connect the Personal Ozone Monitor to the serial port of the computer using the stereo plug to D9 serial cable provided Start your data acquisition software preferably using the 2B Technologies Display and Graphing Software free download from http twobtech com software htm Other terminal emulation software such as HyperTerminal a program provided with Windows or Tera Term Pro may be used as well Personal Ozone Monitor Manual Rev D The ozone mixing ratio internal cell temperature cell pressure time and date are sent as comma delimited ASCII text to the serial and USB ports 19200 baud as selected in the menu 8 bits no parity 1 stop bit every ten seconds 1 minute 5 minutes or 1 hour depending on the averaging time selected from the microprocessor menu Time is provided in 24 hour military format and the date is given in European style day month year A typical data line would read 3 2 307 4 608 1 1 2740 12 1 4001 27765 10513 0308 1591 20 1 23 03 12 16 39 14 where Ozone 3 2 ppb Cell temperature 307 4 K Cell pressure 608 1 torr 1 atm 760 torr Photodiode Voltage 1 2740 volts Power Supply Voltage 12 1 volts Latitude 4001 27765 Longitude 1051
4. Viewing GPS coordinates via the front panel sse 17 6 LAMP TEST 18 7 QUIET MODE 19 8 SERIAL MENU 19 9 USB INSTALLATION 21 9 1 Items Required ite ero eel tte eee btt ree le e EO beet ete 21 9 2 Driver instala t e ie dete de aee ge ete e Pe bd neta 21 10 USING THE USB CONNECTION 24 10 1 Determine the connection port sisi 24 10 2 Using the Connection eet etae ert le e hen tuae hse Oed fans ets nl 25 Personal Ozone Monitor Manual Rev D ii 11 CALIBRATION 26 TAA Equipment Regulred 21 occi p tte vc Beta e eo teta Prec vc Cb See ree te ceo 27 1152 Instrument Preparations oce teret ente eroe ete i eet eer pe obse teta ee Reds 27 11 3 Calibration Setup Preparatiorn cer nte e alta Dn ic gera 28 11 4 Setup Check tette cc bte aaan RENEE E EAA SARENA IAEE ELTE ERE ELE REL EHE lent TL 28 11 5 Ozone LOSS Teste e te neat ete ido tbe tere pis i ead teen 28 11 6 Linearity Check ird pete ea fee ete tte cu deste eer pes abe eee ea etd eeu 28 T1 7 Intercomparisom Test epe i ee n tete e tbe o ie eee dia 29 12 CALIBRATION PROCEDURE 29 12 1 Instrument Preparation siennes 30 12 2 Measurement of Zero Air essen eese nnne nnne E enne innen 30 12 3 Measurement of Ozone Standards 30 12 4 Calibration CUVE gt i ete REOR ERREUR OU RIEN GUIDE EE nire eens herede 31 12 5 Periodic Zero and Span Checks iii 31 13 MAINTENANCE TROUBLESHOOTING 32 14 LABELLED PARTS 36 15 PARTS LIST 39 16 SERVICE LOG
5. 11 3 Calibration Setup Preparation As indicated in the EPA Technical Assistance Document there are several tests that should be performed prior to calibration to ensure the accuracy of the measurements These tests include Setup check Ozone loss test Linearity check Intercomparison test 11 4 Setup Check A visual inspection of the calibration setup should be performed before calibration to verify that the setup is in proper order All plumbing connections should be checked and verified to follow the manufacturer s instructions Any obvious leaks should be fixed and the manifold and sampling lines should be checked for general cleanliness For more information refer to the manufacturer s User Manual for the primary ozone standard or ozone transfer standard 11 5 Ozone Loss Test Some ozone may be lost in the calibration setup due to reaction with the walls of the manifold and sampling lines Any significant loss of ozone must be measured and be subsequently applied to correct the calibration measurements For more information refer to the manufacturer s User Manual for the primary ozone standard or ozone transfer standard 11 6 Linearity Check Since the Personal Ozone Monitor is inherently linear over several orders of magnitude a linearity check provides a test that the instrument is operating properly Instrument linearity can be checked by comparison to an ozone standard see Calibration Procedure Calibration Curve or by
6. 40 111 Personal Ozone Monitor Manual Rev D IDENTIFICATION RECORDS Record the following information for future reference Serial number Warranty start date date of receipt Personal Ozone Monitor Manual Rev D PRINTING HISTORY New editions are complete revisions of the manual and incorporate all previous update pages and write in instructions This manual will be revised as necessary Revisions can be in the form of new editions update pages or write in instructions PROVISION A ure eee ole O epe EEA E March 2012 PROVISION BS TEE A EE January 2014 pi oig TET EE February 2014 A O O I e M E April 2015 TRADEMARKS amp PATENTS 2B Technologies 2B Tech 2B Personal Ozone Monitor and POM are trademarks of 2B Technologies Inc CONFIDENTIALITY The information contained in this manual may be confidential and proprietary and is the property of 2B Technologies Inc Information disclosed herein shall not be used to manufacture construct or otherwise reproduce the goods disclosed herein The information disclosed herein shall not be disclosed to others or made public in any manner without the expressed written consent of 2B Technologies Inc O Copyright 2012 2B Technologies Inc All rights reserved Personal Ozone Monitor Manual Rev D WARRANTY STATEMENT 2B Technologies Inc warrants its products against defects in materials and workmanship 2B Technologies will at its option repair or replace
7. Hz Frequency Response Time 100 of Step Change 20 s 10 points Averaging Times 2s 10 s 1 min 5 min 1 hr 8 192 lines 2s avg 4 5 hrs 10 s avg 1 day 1 min avg 1 wk 5 PEE SAEC min 1 mo 1 hr avg 1 yr Ozone Units ppb ppm pphm ug m mg m Pressure Units mbar torr Temperature Units C K T and P Corrected Yes Operating Temperature 0 to 50 Range Power Requirement Supplied by battery or 110 220 VAC Power Pack 7 14 V dc nominally 250 mA at 12 V 3 0 watt External Battery 7 4 Volt 1 6 amp hour Lithium Polymer Battery 5 8 hr Size 4 0 x 3 0 x 1 5 inches 10 2 x 7 6 x 3 8 cm Personal Ozone Monitor Manual Rev D 3 OPERATION Please read all the following information before attempting to install the Personal Ozone Monitor For assistance please call 2B Technologies at 1 303 273 0559 NOTE Save the shipping carton and packing materials that came with the Personal Ozone Monitor If the Personal Ozone Monitor must be returned to the factory pack it in the original carton Any repairs as a result of damage incurred during shipping will be charged 3 1 Shipping Box Contents Open the shipping box and verify that it contains all of the items on the shipping list If anything is missing or obviously damaged contact 2B Technologies immediately 3 2 Operation of the Personal Ozone Monitor To operate the Personal Ozone Monitor con
8. The GPS quality indication can be translated as 0 fix not available 1 Non differential GPS fix available 2 Differential GPS WAAS fix available and 6 Estimated Personal Ozone Monitor Manual Rev D 5 FRONT PANEL MENU 5 1 Menu Tree The following diagram summarizes the complete instrument Menu accessed via the LCD Select and Move buttons Lmp JOE D T 10 32 21 14 10 2009 Figure 2 Instrument Menu Personal Ozone Monitor Manual Rev D 11 5 2 Data Averaging and Data Logging Using the Menu When first turned on the instrument will start making measurements at a rate of once every 10 s Data may be logged in the internal data logger Up to 8 192 data lines containing log number ozone mixing ratio internal cell temperature internal cell pressure photodiode voltage power supply voltage GPS latitude GPS longitude GPS altitude GPS signal quality time and date may be stored in internal memory corresponding to an operational time of 22 75 hours Averaging times of 1 min 5 min and 1 hr also may be selected from the menu thereby increasing the logging capacity to 5 6 days 28 days and 341 days respectively before filling the memory 5 3 Navigating the Front Panel Menu The front panel consists of a 2 row by 16 character LCD screen and 2 push buttons that are located below the LCD screen see Fig 14 1 below The curved arrow or Select button functions
9. deviation of the measurement itself displayed in the above example as 1 2 ppb for the electronic offset and 1 85 for the standard deviation The standard deviation is a quantitative measure of the lamp and associated electronic noise Electronic offsets should normally be 5 to 5 ppb equivalent After running the lamp test for a few minutes values above 2 50 for the standard deviation usually indicate an excessively noisy lamp Lamps seldom burn out but may become noisy with time and need to be replaced Some lamps become noisy after only a short period while others will be extremely stable for years If your lamp fails the lamp test during the first year of operation contact us for a new lamp under the instrument warranty Personal Ozone Monitor Manual Rev D 18 Contamination of the detection cell may also cause a high standard deviation in which case the flow path should be cleaned with methanol and the internal ozone scrubber replaced Please contact us for detailed procedures if you want to perform these operations on site 7 QUIET MODE The POM firmware allows the user to select a quite mode where the pump will be throttled down to decrease the high pitch frequency sound output This can be done one of two ways The user can press and hold the Select button while powering on the POM to display Pump Mode Quiet Fast where the user can select Quiet which will slow the pump down and change the instrument flush cvcle tim
10. download it see below before starting logging Select Yes if you are sure you want to start logging new data This will return you to the Dat Menu Select lt to return to the main Menu and select lt again to exit the Menu and start making measurements Note that lt always takes you up one level in the menu The Personal Ozone Monitor will then alternate every 5 seconds between displaying the most recent 10 s measurement and the current average value For example the display might read O3 3 2 ppb T 33 3 P 989 7 where the current 10 s measurement is 3 2 ppb by volume the internal cell temperature is 33 3 C and the internal cell pressure is 989 7 mbar 1f 10 second averaging no averaging has been selected five seconds later this display might be followed by 03 2 2 ppb 19 55 23 05 2015 showing that the time of the measurement is 7 55 pm and the date is 23 May 2015 If averaging has been selected the above display will be replaced by Avg 03 24 1 ppb 19 55 23 05 2015 Personal Ozone Monitor Manual Rev D for example where the most recent average value of ozone computed is 24 1 ppb If data are being logged the log number and number of new measurements made for the next average minus 1 are displayed in place of the data and time e g Avg 03 24 1 ppb Log 193 4 where Avg 03 is the average ozone value most recently written to the logger and the current log number is 193 The 4 in 193 4 refers t
11. solution to this often ignored problem is unique to 2B Tech instruments In principle the measurement of ozone by UV absorption requires no external calibration it is an absolute method However non linearity of the photodiode response and electronics can result in a small measurement error Therefore each instrument is compared with a NIST traceable standard ozone photometer in the laboratory over a wide range of ozone mixing ratios These results are used to calibrate the POM with respect to an offset and slope gain or sensitivity The corrections for offset and slope are recorded in the instrument Birth Certificate These calibration parameters are entered into the microprocessor prior to shipment The user may change the calibration parameters from the front panel if desired lt is recommended that the instrument be recalibrated at least once every year and preferably once every six months The offset may drift due to temperature change or chemical contamination of the absorption cell As discussed below an accurate offset correction can be measured from time to time using the external ozone scrubber Zeroing Cartridge supplied with the instrument An animated video explaining how a UV absorbance ozone monitor works is posted on the 2B Tech website at http twobtech com videos general htm Personal Ozone Monitor Manual Rev D 1 2 Adaptive Filter The POM firmware processes sample concentration data through a built in adaptive filte
12. the Personal Ozone Monitor Manual Rev D concentration of molecules M in the detection cell Ozone in units of ppb is then given by 109101 499 MAT y To Ozlppp 10 Air 10 Plo Im 2 2 Where Na is Avagadro s number 6 02214129 x 10 molec mol R is the gas constant 82 05746 cm atm K mol T is the absolute temperature in K and P is the cell pressure in atmospheres The instrument displays and records the cell temperature and pressure in addition to the ozone mixing ratio The cell pressure is displayed and logged in units of mbar or torr and the cell temperature in units of either C or K Shown on Fig 1 is the DewLine which serves to make the humidity entering the detection cell identical during and measurements Please see our website for a technical discussion of the DewLine and its importance to ozone measurements www twobtech com dewline htm Briefly water vapor adsorbed to the inner wall of the detection cell changes the reflectivity of the cell If humidity is not the same during and measurements an offset in the ozone measurement will occur and can be up to several tens of ppb for sudden changes in ambient humidity The offset will change with time as the internal ozone scrubber equilibrates with water vapor Even for fixed site ozone monitors an offset measurement error will occur if the instrument is zeroed with dry tank air and then used to measure ozone in humid air The DewLine
13. 3 0308 Altitude 1591 20 GPS Quality 1 Date March 23 2012 Time 4 39 14 pm If outputting logged data the output serial data line will be preceded by the log number e g 2893 3 2 307 4 608 1 1 2740 12 1 4001 27765 10513 0308 1591 20 1 23 03 12 16 39 14 where 2893 is the log number In addition to data lines messages are written to the serial port when logging is begun or ended when transmission of data from the logger is begun and ended when data collection is interrupted e g due to a power failure and when the averaging time is changed Personal Ozone Monitor Manual Rev D 4 GPS The POM contains an on board GPS unit which incorporates the well known u blox 6 GPS position engine and an efficient antenna system to provide highly accurate and precise location data with each ozone measurement To acquire satellite signals go outdoors away from tall buildings and trees Acquiring satellite signals may take 1 5 minutes For best results stand still in an open area with the POM powered on until an asterisk appears on the LCD as shown below The asterisk denotes a valid satellite connection O3z 2 7 ppb T 31 4 P 982 3 As described in the section Viewing GPS coordinates via the front panel below it is possible to view the GPS data in real time on the LCD by navigating to the GPS submenu GPS coordinates along with the GPS quality indication are also logged with each measurement when the POM is set to log
14. 4 32 21 17 10 2010 meaning that it is 21 seconds after 2 32 p m on October 17 2010 military time and European date To change a number in the date and time move the cursor to underline the numeral you want to change Pressing the Select button then causes a blinking cursor to cover that numeral The number can then be changed by pressing the Move button Once the number is correct press the Select button to turn off the blinking cursor You may now use the Move button to choose another numeral to change Once the time and date is correct selecting will set the internal clock to that time and return the display to the Cfg menu As in setting a digital watch the seconds should be set in advance of the real time since the clock starts to run again only when the set time is entered in this case by selecting 5 11 Viewing the Power Supply Voltage via the front panel To view the power supply voltage in real time select Bat from the Cfg Menu Exit this view by pressing the Select button 5 12 Viewing GPS coordinates via the front panel To view real time Latitude Longitude and Altitude data select GPS from the Cfg Menu Latitude and Longitude are constantly shown and Altitude is Personal Ozone Monitor Manual Rev D 17 available by pressing and holding the Move button Exit this view by pressing the Select button 6 LAMP TEST If the instrument is excessively noisy standard deviation greater than 2 ppb or always
15. Personal Ozone Monitor M 2B Technologies Inc OPERATION MANUAL Model POM O Copyright 2015 2B Technologies Inc All rights reserved Personal Ozone Monitor Manual Rev D Table of Contents IDENTIFICATION RECORDS iv PRINTING HISTORY v WARRANTY STATEMENT vi WARNINGS viii 1 PERSONAL OZONE MONITOR INTRODUCTION 1 121 Theoty ot Operator a e A 1 t2 Adaptive Fite o iii Er E A AS TRIER O 4 2 SPECIFICATIONS 5 2 1 Table of Personal Ozone Monitor Specifications 5 3 OPERATION 7 3 1 Shipping Box Content in sere 2 te oru eter ot Ure ete dte tU RP na dc ae DER na 7 3 2 Operation of the Personal Ozone Monitor us 7 3 3 Measurement of the Zero Offset iii 8 3 4 Collecting Data over the Serial Port in Real Time nn nn 8 4 GPS 10 5 FRONT PANEL MENU 11 m UNICI EU 11 5 2 Data Averaging and Data Logging Using the Menu sse 12 5 3 Navigating the Front Panel Menu sise 12 5 4 Entering the Front Panel Menu sise 12 5 5 To Begin Logging Data iore ette be e da eet rn abel gees 13 5 16 To Stop Logging Data annee nm Re Re ne en n Gere e res 14 aTe To Average Data der f ose t a un deri ree 15 5 8 Capturing the transmitted logged data using the USB or Serial Port essssussss 15 5 9 To Set the Calibration Parameters ir 16 5 10 To Set the Time and Date iii 17 5 11 Viewing the Power Supply Voltage via the front panel 17 5 12
16. chtigt werden DUTCH A OPGELET ledere handeling binnenin het toestel kan beschadiging veroorzaken Om iedere mogelijk gevaarlijke shock te vermijden moet de aansluiting met het net verbroken worden v r het openen van het toestel OPGELET Het symbool A geeft aan dat de gebruiker de instructies in de handleiding moet raadplegen OPGELET Indien het toestel niet gebruikt wordt volgens de richtlijnen van 2B Technologies Inc USA gelden de veiligheidsvoorzieningen niet meer Personal Ozone Monitor Manual Rev D 1 PERSONAL OZONE MONITOR INTRODUCTION The 2B Technologies Personal Ozone Monitor POM is designed to enable accurate measurements of ozone in air over a wide dynamic range extending from a limit of detection of 4 parts per billion by volume ppb to an upper limit of 10 parts per million ppm based on the well established technique of absorption of ultraviolet light at 254 nm Note that throughout this manual and in the instrument output ppb identical to ppbv refers to parts per billion by volume not weight The Personal Ozone Monitor is small 4 0 x 3 0 x 1 5 10 2 x 7 6 x 3 9 cm light weight 0 75 Ib 0 34 kg and has a low power consumption 3 0 watt relative to conventional instruments and is therefore well suited for applications such as e long term monitoring at remote locations where power is highly limited e monitoring and control of ozone in industrial settings e monitoring of expos
17. cipal wavelength of light emitted by the mercury lamp An air pump draws sample air into the instrument at a flow rate of approximately 0 75 L min A solenoid valve switches so as to alternately send this air directly into the absorption cell or through an ozone scrubber and then Temperature Sensor Mirror Mirror DewLine Ozone Pressure Sensor Scrubber Air Inlet Air Pump Solenoid Hg Lamp l Valve Photodiode Figure 1 1 Schematic Diagram of the Personal Ozone Monitor into the absorption cell The intensitv of light at the photodiode is measured in air that has passed through the ozone scrubber 7 and air that has not passed through the scrubber Ozone concentration Os in units of molecules cm is calculated from the measurements of 7 and 1 according to the Beer Lambert Law 03 Zin 2 1 where is the path length 15 cm and c is the absorption cross section for ozone at 254 nm 1 15 x 10 cm molecule or 308 atm cm which is known with an accuracy of approximately 190 The 2B Technologies instrument uses the same absorption cross section extinction coefficient as used in other commercial instruments In order to convert this concentration to a mixing ratio fraction of total air molecules that are ozone we also measure the cell temperature and pressure which determines the total concentration of air molecules From the temperature and pressure we use the ideal gas law to calculate
18. ctions The following are indications of various instrument malfunctions Air Pump Failure The instrument will not make a humming sound Also the circuit breaker may prevent the instrument from powering up if the motor in the air pump develops a short Lamp Failure The ozone measurements will be erratic and the Lamp Test will show 0 0 volts for the photodiode voltage Solenoid Valve Failure The ozone readings will be low and average to close to zero if the solenoid valve is not switching Partial switching of the solenoid valve will cause the instrument to read low but not zero Contaminated Flow Path The instrument will typically have a large positive or negative offset and the ozone readings will be low once corrected for the measured offset Help with trouble shooting is provided in the following table Corrective actions listed may be performed by the user however we recommend first contacting 2B Tech for more detailed instructions or returning the instrument for repairs Personal Ozone Monitor Manual Rev D 32 Table 13 1 Troubleshooting the Personal Ozone Monitor for performance problems Problem symptom Likely cause Instrument does not turn on Instrument turns on then powers off Readings are noisy with standard deviations greater than 2 5 ppb Required calibration parameters are large 29 ppb offset and or gt 19 slope when calibrated using a standard ozone source or reliable ozone instrume
19. dilution of an ozone measurement To check the instrument linearity by dilution of an ozone measurement generate and measure a concentration of ozone near the upper range of ozone concentrations to be measured using the POM Additional ozone concentrations should be generated by accurately diluting the ozone flow with zero air and each concentration should be measured once the instrument Personal Ozone Monitor Manual Rev D 28 reaches a stable response The accuracy of the linearity test relies on the accuracy of the flow meters used to perform the dilution The percent of non linearity is calculated from the formula F R F TES Que ES R 100 where H Dilution ratio F Ozone generator flow Fa Diluent zero air flow E Linearity error in percent C Measured concentration of original concentration C Measured concentration of diluted concentration The linearity error should not be greater than 5 If the error is greater than 596 the accuracy of the flow dilution should be checked before assuming that the instrument is not linear Note that the inherent linearity of the POM is better than the error calculated in this linearity check due to the uncertainty introduced by the flow measurements 11 7 Intercomparison Test Comparison of the calibration setup with other ozone standards is a good check of the overall accuracy of the setup If measurements from another ozone standard are found to deviate from t
20. e POM to sample zero air until the response is stable 3 Record the average zero air response 12 3 Measurement of Ozone Standards 1 Generate an ozone concentration slightly less than the concentration range of interest and allow the ozone generator to warm up for at least 5 minutes The same zero air supply used for making zero air measurements must be used in the ozone generator 2 Allow the Personal Ozone Monitor to sample the ozone concentration standard until a stable response is measured 3 Record the average response of the Personal Ozone Monitor as well as either the average response of the UV photometer the transfer standard 4 Generate several other ozone concentration standards At least 5 ozone concentration standards are recommended over the range of interest 5 For each ozone concentration standard record the response of the Personal Ozone Monitor as well as either the response of the UV photometer or the transfer standard Personal Ozone Monitor Manual Rev D 30 12 4 Calibration Curve Plot the POM Monitor responses x axis versus the corresponding standard ozone concentrations y axis Fit the data to a straight line y 2 mx b using the linear regression technique to determine the calibration relationships Determine if any points deviate significantly from the line which is an indication of an error in determining the calibration curve The error may be due to the calibration setup or the Personal Oz
21. e from 2 seconds to 4 seconds This setting will also change the 10 second averaging time to 20 seconds Changing back to Fast will reset the flush time to 2 seconds The other way to change to the quiet mode is through the serial menu as described in the next section 8 SERIAL MENU Measurements and logging tasks can be accessed via the serial port or the USB using a terminal emulator such as Tera Term Pro or HyperTerminal running on an attached computer Commands can be sent using the terminal emulator set with the properties listed in the section of this manual entitled Collecting Data over the Serial Port in Real Time Listed below are the lower case letters that are commands for performing certain operations while the instrument continues to measure Start logging and write over existing logged data t Transmit logged data e End logging h Output serial data line header m Serial menu If the letter m is sent as a command menus will be displayed in the terminal emulator window When the serial menu is accessed the instrument is no Personal Ozone Monitor Manual Rev D 19 longer making measurements it is waiting for the next command to be entered The following is the list of menu items accessible from this point t zz p N oa 50 Start logging and write over existing logged data Transmit logged data End logging Output serial data line header Displays list of possible averaging times and the numbe
22. e monitor based on UV absorbance a UV photometer that has been setup in accordance with the procedures prescribed by the U S Environmental Protection Agency EPA under Title 40 of the Code of Federal Regulations Part 50 Appendix D 40 CFR Part 50 2 An Ozone Transfer Standard is a system a portable ozone monitor and or a portable ozone generator which can produce accurate ozone concentration standards which are quantitatively related to a primary ozone standard An example of an ozone transfer standard is the 2B Technologies Model 306 Ozone Calibration Source Ozone transfer standards must be certified before use in accordance with the procedures prescribed by the U S Environmental Protection Agency EPA under Title 40 of the Code of Federal Regulations Part 50 Appendix D 40 CFR Part 50 Personal Ozone Monitor Manual Rev D 26 11 1 Equipment Required The equipment that is needed to carry out the calibration is commercially available or it can be assembled by the user Calibration using a primary ozone standard involves the generation of ozone concentrations that are simultaneously measured by a primary ozone standard and the instrument undergoing calibration This procedure requires the following equipment Zero air source Ozone generator Sampling manifold inert material such as PTFE or FEP only Sampling lines inert material such as PTFE or FEP only UV Photometer Dieu O Use of a certified transfer standard fo
23. ed Click Next to continue Ce JL ne 7 Navigate to folder where you unzipped the cdc NTXP Found New Hardware Wizard Please choose your search and installation options SS Y Search for the best driver in these locations Use the check boxes below to limit or expand the default search which includes local paths and removable media The best driver found will be installed Search removable media floppy CD ROM C Include this location in the search O Don t search will choose the driver to install Choose this option to select the device driver from a list Windows does not guarantee that the driver you choose will be the best match for your hardware 8 Select Continue Anyway when this window appears Personal Ozone Monitor Manual Rev D 22 Hardware Installation The software you are installing for this hardware USB to UART has not passed Windows Logo testing to verify its compatibility with Windows lt P Tell me why this testing is important Continuing your installation of this software may impair or destabilize the correct operation of your system either immediately or in the future Microsoft strongly recommends that you stop this installation now and contact the hardware vendor for software that has passed Windows Logo testing Continue Anyway STOP Installation 9 After a few seconds the driver will be finished installing Found New Hardware Wizard Comp
24. ere effettuato sullo strumento pu essere potenzialmente pericoloso a causa della corrente elettrica Il cavo di alimentazione deve essere staccato dallo strumento prima della sua apertura ATTENZIONE Il simbolo A sullo strumento avverte l utilizzatore di consultare il Manuale di Istruzioni alla sezione specifica ATTENZIONE Se questo strumento viene utilizzato in maniera non conforme alle specifiche di 2B Technologies Inc USA le protezioni di cui esso e dotato potrebbero essere alterate ESPANOL du TENCION Cualquier operaci n que requiera acceso al interior del equipo puede causar una lesi n Para evitar peligros potenciales desconectarlo de la alimentaci n a red antes de abrir el equipo ATENCION Este s mbolo A en el instrumento indica que el usuario deberia referirse al manual para instrucciones de funcionamiento ATENCION Si este instrumento se usa de una forma no especificada por 2B Technologies Inc USA puede desactivarse la protecci n suministrada por el instrumento DEUTSGH A marnomwas Vor dem Offnen des Ger tes Netzstecker ziehen WARNHINWEIS Dieses Das dem Ger t weist darauf hin dab der Anwender zuerst das entsprechende Kapitel in der Bedienungsanleitung lesen sollte WARNHINWEIS Wenn das Ger t nicht wie durch die Firma 2B Technologies Inc USA vorgeschrieben und im Handbuch beschrieben betrieben wird k nnen die im Ger t eingebauten Schutzvorrichtungen beeintr
25. evice Manager button 4 Press the sign next to Ports Device Manager File Action View Help Em amp lt Disk drives 2 DYD CD ROM drives Floppy disk controllers IDE ATAJATAPI controllers amp IEEE 1394 Bus host controllers gt Keyboards Mice and other pointing devices BB Network adapters BB 1394 Net Adapter BB Intel R PRO 100 VE Network Connection Bg ORINOCO Wireless LAN PC Card 3 3 volt S E Other devices PCI Modem Video Controller VGA Compatible E PCMCIA adapters Ports COM amp LPT A Communications Port COMI Y ECP Printer Port LPT1 Y USB to UART COMS MR Processors 7 0 Sound video and game controllers Personal Ozone Monitor Manual Rev D 24 5 In Parenthesis next to the USB to UART listing is the assigned COM port number This number will be used for the settings for the 2B Tech software or terminal emulator used to read data from the POM 10 2 Using the Connection e Plug the USB cable in after the powering the POM to ensure correct functionality e When setting up your software or terminal emulator choose the correct com port listed in the Device manager e Use these baud rate settings 19200 8 bits no parity 1 stop bit e Use 2B Technologies Display and Graphing Software free download from http twobtech com software htm to read measurement data from the POM Personal Ozone Monitor Manual Rev D 25 11 CALIBRATION
26. he calibration setup greater than the instrument specifications one of the calibration setups is not accurate 12 CALIBRATION PROCEDURE A multipoint calibration should be performed within the calibration frequency any time major disassembly of components is performed or any time the zero or span checks give results outside of the acceptable limits Personal Ozone Monitor Manual Rev D 29 12 1 Instrument Preparation 1 Turn on the Personal Ozone Monitor and allow it to stabilize for a minimum of one hour 2 Enter the calibration menu Main Menu Cfg Cal O3 and set the zero Z value to 0 and the slope S value to 1 00 3 Connect the Personal Ozone Monitor to the manifold on the ozone calibration setup If a particle filter will be used in normal operation the calibration must be performed through the filter The manifold must be vented to atmosphere so that pressure does not build up in the calibration setup Connection of the POM directly to a pressurized output of any device can damage the instrument 4 Verify that the flow rate into the manifold is greater than the total flow required by the Personal Ozone Monitor plus any other flow demand drawing from the manifold such as a UV photometer or ozone transfer standard 12 2 Measurement of Zero Air 1 Verify that the zero air supply is on and the ozone generator is off The same zero air supply used in the ozone generator must be used in the ozone generator 2 Allow th
27. ld be within the instrument specifications If the measurements are not within specifications this is an indication of problem in the calibration setup or the POM being checked The most likely causes of problems in the POM are leaks a malfunctioning ozone scrubber a contaminated valve or contamination in the optical setup See the Troubleshooting section of the manual Personal Ozone Monitor Manual Rev D 31 13 MAINTENANCE TROUBLESHOOTING The Personal Ozone Monitor is designed to be nearly maintenance free The only component that requires routine maintenance is the ozone scrubber which should be changed at least once every six months of operation Also the inlet filter user supplied should be changed as recommended by the filter manufacturer To change the internal ozone scrubber remove the top cover by removing the four bolts that hold it in place The scrubber is connected to the inlet and the long end of the solenoid valve see Figure 6 below This scrubber can easily be replaced by disconnecting the silicone attached to each end and connecting a new one in its place Other components with a limited lifetime are the air pump 73 000 hours lamp 920 000 hours and solenoid valve rarely fails It is recommended that the instrument we returned to 2B Technologies if any of these components fail Alternatively the user may install these components at their own risk In that case please contact 2B Technologies for instru
28. lect that parameter for change and activate a blinking cursor Once S or Z is selected its value can be changed by pressing the Move button to increase the value The value will roll over to negative values after reaching the maximum allowable offset After choosing the desired value press the curved arrow to exit stop editing mode The cursor can then be moved by pressing the right pointing arrow to the S to edit the slope or to lt to exit the submenu Once the values of Z and S are set selecting 4 will return the display to the Cfg menu and again selecting lt will return to Menu The Personal Ozone Monitor Manual Rev D 16 calibration parameters reside in non volatile memory and are not affected by power failures In order to adjust the zero offset after the instrument has warmed up for at least 20 minutes attach the external ozone scrubber and make measurements for a few minutes If the average of those measurements is 4 4 ppb for example subtract 4 from the current value of Z i e if Z was set to 3 during the measurements change Z to 1 For more details about calibrating the Personal Ozone Monitor against another instrument or calibrated ozone source see the Calibration section of this manual or refer to Tech Note No 15 at http www twobtech com tech notes TNO15 pdf 5 10 To Set the Time and Date From the Main Menu select the Cfg submenu Next select the D T submenu The display will read for example D T 1
29. leting the Found New Hardware Wizard The wizard has finished installing the software for E USB to UART E Cliek Finish to close the wizard Personal Ozone Monitor Manual Rev D 23 10 USING THE USB CONNECTION 10 1 Determine the connection port After installation is complete determine which COM port the connection is using This can be done by the following procedure 1 If using Windows XP Vista 7 go to the control panel and select System 2 Click on the Hardware tab T System Properties System Restore Automatic Updates Remote General Computer Name Hardware Advanced Device Manager The Device Manager lists all the hardware devices installed ETT AD on your computer Use the Device Manager to change the properties of any device Administrative Automatic Date and Time Tool Updat in dates e 9 e 29 Internet Keyboard Mail Options Drivers E Driver Signing lets you make sure that installed drivers are compatible with Windows Windows Update lets you set up how Windows connects to Windows Update for drivers d Ga Y Driver Signing J L Windows Update E Power Options Printers and Regional and Scanners and Faxes Language Cameras Hardware Profiles a Hardware profiles provide a way for you to set up and store e2 ES diferent hardware configurations Speech System Taskbar and User Accounts Hardware Profiles ps Start Menu 3 Click the D
30. m 2B Technologies to the customer in order to return the product to operation within stated specifications If such support is not efficient and effective the product may be returned to 2B Technologies for repair or replacement Prior to returning the product a Repair Authorization Number RA must be obtained from the 2B Technologies Service Department We will provide you with a simple Repair Authorization Form to fill out to return with the instrument Personal Ozone Monitor Manual Rev D vi Shipping 2B Technologies will pay freight charges for replacement or repaired products shipped to the customer site Customers shall pay freight charges for all products returning to 2B Technologies Conditions The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance adjustment calibration or operation by customer Maintenance adjustment calibration or operation must be performed in accordance with instructions stated in this manual Usage of maintenance materials purchased from suppliers other than 2B Technologies will void this warranty Limitation of Remedies and Liability The remedies provided herein are the Customer s sole and exclusive remedies In no event shall 2B Technologies be liable for direct indirect special incidental or consequential damages including loss of profits whether based on contract tort or any other legal theory The Personal Ozone Monitor manual is believed to be acc
31. nect it to an external power source and power the instrument by switching the power switch on The instrument requires a 7 24 V DC source which can be supplied by 1 the 100 240 V AC power adapter 2 a cigarette lighter adapter plugged into a 12 V DC source such as found in an automobile or many light aircraft or 3 a 7 24 V battery The source can be in the range 7 24 V DC without any detrimental effects on the measurement When using a battery be certain to attach the positive red and negative black wires correctly Batteries and battery chargers are available from 2B Technologies A circuit breaker and diode are installed on the circuit board in case of an electrical short or incorrect battery attachment If activated the breaker will reset itself after a few minutes Once turned on the instrument will display the version number of the software installed on the microprocessor After a few seconds the instrument will start displaying readings for ozone The first dozen readings requiring about two minutes will be spurious with large positive and negative swings due to the rapid warmup of the lamp and electronics Also ozone readings may be Personal Ozone Monitor Manual Rev D inaccurate during the 10 20 minutes required for the lamp photodiode and internal temperature of the absorption cell to stabilize Inlet tubing may be attached to the white fitting on the front of the instrument The inlet tubing should be made of PTFE Tefl
32. nly 0 75 Ib 340 g It has a built in GPS so that ozone measurements may be logged continuously along with geographic location By folding the optical path in the shape of a U it was possible to achieve the same path length in the POM as in the Models 202 205 and 106 L and thus have similar precision and accuracy 2 ppb or better Personal exposure monitoring for studies of health effects of air pollutants Health and safety monitoring at industrial sites using ozone Citizen science and educational measurements such as GO3 Treks Vertical profiling using balloons kites RPVs and light aircraft where space and weight are highly limited Long term monitoring at remote locations where power is highly limited Urban arrays of ground based detectors 2 1 Table of Personal Ozone Monitor Specifications Measurement Principle UV Absorption at 254 nm Linear Dynamic Range 2 0 ppb to 10 ppm Resolution 0 1 ppb Personal Ozone Monitor Manual Rev D Precision 10 rms noise Greater of 2 0 ppb or 296 of reading Accuracy Greater of 2 0 ppb or 2 of reading Limit of Detection 20 4 0 ppb NIST Traceable Calibration Yes Measurement Interval 10 s Data averaging options 2s 10 s 1 min 5 min 1 hr Flow Rate nominal 70 8 Liter min Flow Rate Requirement 20 5 L min 2 ppb day Baseline Drift 5 ppb year nh p lt 1 day Sensitivity Drift lt 3 year Measurement Time 10 s 0 1
33. nt Power not connected properly or circuit breaker open Burned out air pump Lamp output is weak below 0 6 V on Lamp Test Flow path contaminated Ozone scrubber is contaminated Flow path is contaminated 33 Check external power connection for reverse polarity or a short and wait a few minutes for the thermal circuit breaker to reset Remove top cover and unplug air pump Turn instrument on if it remains running then the air pump motor is burned out and shorting Replace air pump Remove top cover and check lamp connection to circuit board Run Lamp Test from menu If photodiode voltage is less than 0 6 V replace lamp Clean flow path with methanol according to the Cleaning Procedure Replace ozone scrubber Be sure to use an inlet filter to remove particulate matter Clean flow path with methanol following the Cleaning Procedure Personal Ozone Monitor Manual Rev D Solenoid valve is Remove top cover contaminated and not unplug pump turn opening and closing instrument on and listen properly for clicking of solenoid valve every 2 seconds If solenoid valve is clicking remove tubing connections and test solenoid valve to confirm that air always flows through common and alternately through normally open and normally closed states Replace solenoid valve if not working properly This requires soldering Air pump is not drawing As a first check hold sufficient flow
34. o the number of 10 s data points that have been measured so far for inclusion in the next average to be displayed and logged If 1 min averaging is used this number will increment from 0 to 5 for 5 min averaging the number will increment from 0 to 29 and for 1 hr averaging it will increment from O to 359 This number is displayed so that the user will know how many more 10 s measurements need to be made before a new average is displayed and logged If there is a power failure while the instrument is in the logging mode logging will resume after power is restored A note of Data Interruption will be written to the logger prior to writing the first new data line The instrument can accommodate multiple data interruptions due to power failures For example one can purposely switch the instrument off move to another location and restart logging simply by turning the instrument back on Data sets will be separated by the data interrupt message 5 6 To Stop Logging Data Hold in the Select button to obtain the Menu Go to the Dat submenu by clicking on Dat Select the End function This will end data logging You may now return to the Dat menu to transmit the data to a computer by selecting Xmt see below The stored data will reside in memory even when new measurements are being made and can be transmitted using the Xmt function as often as you like Note All stored data are lost once logging is started again using the Log function Thu
35. on PFA FEP PVDF or some other inert material that does not destroy ozone and that does not desorb plasticizers and other organics that can contaminate the flow path The length of tubing should be kept as short as possible preferably not more than a few feet to minimize ozone destruction within the inlet tubing Tygon polypropylene which may look like Teflon and metal tubing should not be used FEP lined Tygon tubing which is used inside the instrument provides the flexibility of Tygon with the inertness of FEP A Teflon or PVDF inlet filter is highly recommended to prevent internal contamination of the tubing and absorption cell by particulate matter The filter should be tested for ozone loss by measuring ambient ozone with and without the filter attached Filters and filter holders are available through 2B Technologies Although the instrument compensates for temperature drift if strong temperature fluctuations are expected as in vertical profiling applications using balloons the instrument should be placed in a thermally insulated box 3 3 Measurement of the Zero Offset The electronic zero of the instrument may be measured by attaching an ozone zeroing scrubber part no ZEREXTPOM or other ozone destruction cartridge to the air inlet for a period of 5 10 minutes For an accurate measurement the instrument must have been turned on long enough for the internal temperature to stabilize The observed offset which can amount to
36. one Monitor being calibrated The most likely causes of problems for the POM are leaks a malfunctioning ozone scrubber a contaminated valve or contamination in the optical setup See the Troubleshooting section of the manual The slope of the line is the gain factor S and the intercept is the offset Z that need to be applied to the instrument response to calibrate it to the primary ozone standard If the intercept is outside of the range from 10 to 10 or the slope is outside of the range from 0 90 to 1 10 this is an indication of a problem in the calibration setup or the instrument being calibrated The most likely cause of errors in the POM are leaks a malfunctioning ozone scrubber a contaminated valve or contamination in the optical setup See the Troubleshooting section of the manual Enter the calibration menu Main Menu Cfg Cal in the instrument firmware and set the calibration parameters 12 5 Periodic Zero and Span Checks To ensure the quality of the Personal Ozone Monitor data periodic zero and span checks can be performed by following the steps below 1 2 3 A zero check is performed by sampling zero air with the POM following the Measurement of Zero Air section above A span check is performed bv sampling an ozone concentration at the high end of the concentration range of interest following the Measurement of Ozone Standards section above Average measurements from the zero check or span check shou
37. or this reason frequent zeroing of the instrument using an external ozone scrubber to determine the offset is recommended Any change in the slope gain of the instrument is likely due to a serious problem such as contamination an air leak obstruction of air flow or loss of catalytic activity by the internal ozone scrubber but it also can be adjusted Once the zero of the instrument is corrected the slope may be adjusted so that the instrument readout agrees with a standard ozone source such as the 2B Technologies Model 306 Ozone Calibration Source or with the readout from another instrument whose calibration is considered to be accurate To change the calibration parameters choose the Cfg submenu from the main Menu and click on Cal to obtain the display Cal Menu Z 3 S 1 01 Here Z is the offset applied in this case 3 ppb and S is the slope applied in this case 1 01 The value of Z is added to the measured ozone value and the value of S is then multiplied by the measured ozone value During calibration Z is set to O and S set to 1 00 if the instrument reads an average of 3 ppb with the external scrubber in place the value of Z should be set to 3 If after correction for the zero the instrument consistently reads 296 low the value of S should be set to 1 02 When the Cal Menu first appears the Z will be underlined with a cursor You may move the cursor to choose the calibration parameter S or Z Selecting S or Z will se
38. orms usually in Start All Programs Accessories Communications Hyper Terminal or Terra Term Pro which can be downloaded at http logmett com index php download tera term 486 freeware html The correct settings for receiving data are chosen baud rate 19200 8 bits no parity 1 stop bit Enter the Main Menu Go to the Dat submenu by clicking on Dat Next select Xmt The message Logged Data will be written to the serial port followed by a carriage return and all of the lines of logged data After all data are transmitted the message End of Logged Data and a carriage return are written After transmission is complete you can return to any position in the menu or resume ozone measurements The logged data continues to be available for transmission until a new data log is started Personal Ozone Monitor Manual Rev D 5 9 To Set the Calibration Parameters The instrument is calibrated at the factory where slope S and offset Z parameters are entered into the instrument s memory These preset calibration parameters are given in the instrument s Birth Certificate and recorded on the calibration sticker on the back of the instrument However the calibration parameters may be changed by the user Because of noise and or an inherent offset some measured values will be below zero at very low ozone mixing ratios or while zeroing the instrument with an external scrubber Also the instrument zero may drift by a few ppb over time F
39. products which prove to be defective The warranty set forth is exclusive and no other warranty whether written or oral is expressed or implied 2B Technologies specifically disclaims the implied warranties of merchantability and fitness for a particular purpose Warranty Periods The warranty period is one 1 year from date of receipt by the purchaser but in no event more than thirteen 13 months from original invoice date from 2B Technologies Inc Warranty Service Warranty Service is provided to customers via web ticket email and phone support Monday Friday from 9 00 a m to 5 00 p m Mountain Time USA The preferred method of contacting us is through our web ticketing software at www twobtech com techsupport This way all technical staff at 2B Tech will be alerted of your problem and be able to respond When you receive an email reply please click on the Ticket link provided to continue to communicate with us directly over the internet The web ticket approach to customer service allows us to better track your problem and be certain that you get a timely response We at 2B Tech pride ourselves on the excellent customer service we provide You may also contact us by email at techsupportOtwobtech com or by phone at 41 303 273 0559 In either case a web ticket will be created and future communications with you will be through that ticket Initial support involves trouble shooting and determination of parts to be shipped fro
40. r During operation the firmware may automatically switch between two different filters lengths based on the conditions at hand During the measurement of stable concentrations the firmware by default computes an average of the last 30 raw measurements or approximately 1 minute This provides smooth and stable readings by averaging out a considerable amount of random noise to improve the precision If the filter detects rapid changes in concentration the filter reduces the averaging to only 10 samples or about 20 seconds to allow the analyzer to respond more quickly Two conditions must be simultaneously met to switch to the short filter First the instantaneous concentration must differ from the average in the long filter by at least 15 ppb Second the instantaneous concentration must differ from the average in the long filter by at least 596 of the average in the long filter The lengths of the long and short filter can be changed as well as the minimum difference and percent difference This can be done via the serial or USB connection as outlined in the Serial Menu section in this manual To disable the adaptive filter set the short filter length to 1 the difference to 0 and the percent to O Personal Ozone Monitor Manual Rev D 2 SPECIFICATIONS 2B Tech has taken the next step in miniaturization of UV based ozone monitors by developing the Personal Ozone Monitor or POM The POM has dimensions of 4 x 3 x 1 5 inches and weighs o
41. r calibration involves the generation of ozone concentrations using the calibrated ozone generator that are measured by the instrument undergoing calibration This procedure requires the following equipment Zero air source Certified Transfer Standard Sampling manifold inert material such as PTFE or FEP only Sampling lines inert material such as PTFE or FEP only gni ud oda Zero air can be generated either from compressed cylinders or from scrubbed ambient air If ambient air is used contaminants such as ozone and nitric oxide must be removed Detailed procedures for generating zero air are in the EPA s Technical Assistance Document for the Calibration of Ambient Ozone Monitors 11 2 Instrument Preparation Prior to calibration follow the steps below 1 Turn on the Personal Ozone Monitor and allow it to stabilize for a minimum of one hour 2 Connect the instrument to the manifold on the ozone calibration setup f a particle filter will be used in normal operation the calibration must be performed through the filter The manifold must be vented to atmosphere so that pressure does not build up in the calibration setup Connection of the POM directly to a pressurized output of any device can damage the Personal Ozone Monitor 3 Verify that the flow rate into the manifold is greater than the total flow required by the instrument and any other flow demand drawing from the manifold Personal Ozone Monitor Manual Rev D 27
42. r that must be entered to change to the desired averaging time Displays current zero calibration setting and waits for new setting followed by a carriage return Displays current slope calibration setting and waits for new setting followed by a carriage return Clock menu displays current date and time and waits for d or t to be entered From clock menu d Asks to enter date in DDMMYY format t Asks to enter time in HHMMSS format Outputs GPS data sentences as read from GPS device Outputs the serial number of the instrument Sets pump mode to FAST 2 second cycles Sets pump mode to QUIET 4 second cycles Displays current Adaptive filter difference and waits for new setting followed by a carriage return Displays current Adaptive filter percent and waits for new setting followed by a carriage return Displays current Adaptive filter long average length and waits for new setting followed by a carriage return Displays current Adaptive filter short average length and waits for new setting followed by a carriage return Exit menu and return to measuring Personal Ozone Monitor Manual Rev D 20 9 USB INSTALLATION The following procedure describes how to install the USB connection for the Model Personal Ozone Monitor 9 1 Items Required peto qe Personal Ozone Monitor USB Cable supplied with POM PC Computer with Windows 2000 XP Vista 7 or 8 USB to UART Driver Disk or download from 2B Tech website here http twob
43. re 14 3 Inside View Personal Ozone Monitor Manual Rev D 37 Scrubber Valve NO Connection Ozone Scrubber Inlet Connection Scrubber Valve NC Connection Figure 14 4 Inside view without Nafion Photodiode Absortion Cell Pressure Sensor Clock Battery 3 3V Temperature Sensor Figure 14 5 Inside view without Scrubber or Nafion Personal Ozone Monitor Manual Rev D 38 15 PARTS LIST The following list includes those parts that are user serviceable They may be ordered online 2B Technologies from our website here htto twobtech com shop html Or contact us at sales twobtech com Part Number SGRBINTPOM ZEREXTPOM OZLAMPPOM OZPUMPPOM PDASSVPOM OZCELPOM SERCABLPOM USBCABL 12VADP TEFTYG SILTUB Description Ozone scrubber internal Ozone zeroing scrubber external Lamp and inverter Air pump Photodiode assembly Absorption cell Serial port cable to computer USB Cable 12 V DC cigarette lighter adapter Teflon lined Tvgone tubing Silicone tubing Personal Ozone Monitor Manual Rev D 39 16 SERVICE LOG Date Calibrated Cleaned New Oz New Pump New Hours Scrubber main Lamp SU Personal Ozone Monitor Manual Rev D 40 Date Calibrated Cleaned New O New Pump New Other Hours Scrubber main Lamp
44. reads near zero in the presence of ozone it is useful to perform the lamp test to make sure that the lamp is turning on and does not fluctuate too rapidly Before performing the lamp test allow the instrument to warm up for at least twenty minutes Choose Lmp from the main Menu The display will momentarily read Lamp Test The photodiode voltage will then be displayed and after a few lamp measurements have been made the electronic offset and standard deviation also will be displayed as for example PDV 0 89801 V 1 24 1 85 The photodiode voltage PDV is a measure of the lamp intensity and should be in the range 0 6 2 2 volts Since absorbance is a ratio measurement the absolute value of the voltage is not particularly important However above 2 5 volts which could occur if the instrument is allowed to become too hot the photodiode is saturated and the calculated ozone concentration will be zero Photodiode voltage less than 0 6 volts is indicative of either a weak lamp or a dirty detection cell and may result in a noisy measurement The photodiode voltage will typically increase as the instrument warms up Lamp drift is continuously monitored and corrected for in the firmware and thus has very little effect on the measured ozone concentration Once the instrument is warmed up fluctuations in photodiode voltage should be limited primarily to the last digit displayed The lamp test also calculates an electronic offset and standard
45. s you should always transmit your data to a computer before restarting logging If you fail to End logging prior to transmitting the data using the Xmt function the instrument will automatically execute the End function for you prior to transmitting the data Personal Ozone Monitor Manual Rev D 5 7 To Average Data Hold down the Select button to obtain the Menu Select Avg to obtain the Avg menu Avg Menu 2s 10s 1m 5m 1h lt Use the Move button to move the cursor to 2s 10s 1m 5m or 1h for averaging times of 2 s no averaging 10 s 1 min 5 min or 1 hr averaging respectively Then select the averaging time you want to use You will be returned to the main Menu To exit the Main Menu and start acquiring data select lt again While in averaging mode the current 10 s measurement 2 s if selected 2 second in averaging menu is displayed alternately with the average value at 5 s intervals as discussed above Averaged data may be logged thereby greatly extending the length of time that the data logger can be used 5 8 Capturing the transmitted logged data using the USB or Serial Port Connect the USB or serial port of the instrument to your computer using the appropriate cable Enable a data acquisition program on the computer such as the 2B Technologies Display and Graphing Software which can be downloaded at http twobtech com software htm Alternativelv HvperTerminal can be used available on most Windows platf
46. tech com downloads software htm 9 2 Driver Installation Insert USB to UART Driver Disk in the computer s CD ROM drive or download the Model POM USB Driver from the 2B Tech website The installation files are located in a zip folder Navigate to the folder labeled cdc NTXP and double click on it Unzip the contents to a folder on the desktop or any area you wish With the POM off attach USB cable from the POM to a USB port on the computer Turn on POM The install wizard should pop up as follows Select No not this time and click Next Found New Hardware Wizard Welcome to the Found New Hardware Wizard Windows will search for current and updated software by looking on your computer on the hardware installation CD or on the Windows Update web site with your permission Read our privacy policy Can Windows connect to Windows Update to search for software O Yes this time only O Yes now and every time connect a device No not this time Click Next to continue 6 Select the Install from a specific location option and click Next Personal Ozone Monitor Manual Rev D 21 Found New Hardware Wizard This wizard helps you install software for 106 RS232 If your hardware came with an installation CD E or floppy disk insert it now What do you want the wizard to do O Install the software automatically Recommended B Install from a list or specific location Advanc
47. to enter and exit menus and for selecting values The right pointing arrow or Move button functions to move the cursor from left to right 5 4 Entering the Front Panel Menu The menu is accessed via the Select button curved arrow on the front panel of the instrument To reach the menu hold in the Select button until Menu is displayed then release the Select button After a few seconds the menu will appear Menu Dat Avg Cfg Lmp c where Dat Avg Cfg and Lmp are submenus that may be selected A blinking cursor will show across the D of the Dat submenu Clicking on the Move button will move the cursor under the first letter of one of the other submenus To select a particular submenu move the cursor under the first letter of a submenu by pressing the Move button and press the Select button to select the submenu To exit the Main Menu and begin making measurements again move the cursor to left arrow and press the Select button Personal Ozone Monitor Manual Rev D 5 5 To Begin Logging Data Select the Dat submenu from the Main Menu using the Select button The display will now show Dat Menu Xmt Log End To start logging data move the cursor to Log and click to select the logging mode Vou will then receive the prompt Overwrite Data No Ves E Warning If you start logging all data previously stored in the logger will be irretrievably lost If you have data in the logger that you want to keep be sure to
48. urate at the time of publication and no responsibility is taken for any errors that may be present In no event shall 2B Technologies be liable for incidental or consequential damages in connection with or arising from the use of the Personal Ozone Monitor manual and its accompanying related materials Warranty is valid only for the country designated on the 2B Technologies quote or invoice Personal Ozone Monitor Manual Rev D vii WARNINGS ENGLISH A WARNING Anv operation requiring access to the inside of the equipment could result in injury To avoid potentially dangerous shock disconnect from power supply before opening the equipment WARNING This symbol A on the instrument indicates that the user should refer to the manual for operating instructions WARNING If this instrument is used in a manner not specified bv 2B Technologies Inc USA the protection provided bv the instrument mav be impaired FRANCAIS AF TTENTION Chaque op ration l int rieur de l appareil peut causer du pr judice Afin d viter un shock qui pourrait tre dangereux disconnectez l appareil du r seau avant de l ouvrir ATTENTION Le symbol A indique que l utilisateur doit consulter le manuel d instructions ATTENTION Si l instrument n est pas utilis suivant les instructions de 2B Technologies Inc USA les dispositions de s curit de l appareil ne sont plus valables ITALIANO A ATTENZIONE Qualsiasi intervento debba ess
49. ure to individuals in the workplace e personal exposure monitoring for studies of health effects of air pollutants For aircraft flights where high temporal and spatial resolution is desired the Model 205 Ozone Monitor is recommended 1 1 Theory of Operation Absorption of UV light has long been used for measurements of atmospheric ozone with high precision and accuracy The ozone molecule has an absorption maximum at 254 nm coincident with the principal emission wavelength of a low pressure mercury lamp Fortunately few molecules found at significant concentrations in the atmosphere absorb at this wavelength However interferences such as organic compounds containing aromatic rings can occur in highly polluted air For additional information about UV absorbing interferences and how to estimate their contributions see Tech Note 040 Figure 1 1 is a schematic diagram of the Personal Ozone Monitor Ozone is measured based on the attenuation of light passing through a 15 cm absorption cell fitted with quartz windows The 15 cm cell length is accomplished by using a U shaped cell with mirrors in the corners to transmit light from the lamp at one end to the detector at the other A low pressure mercury lamp is located on one side of the absorption cell and a photodiode is located on the opposite side of the absorption cell The photodiode has a built in interference filter Personal Ozone Monitor Manual Rev D centered on 254 nm the prin
50. your finger over the air inlet to determine whether air is being drawn in If there is flow measure the flow rate by attaching a high conductance flow meter to the air inlet Air flow should be greater than 0 6 L min If flow is lower check for leaks If there are no leaks replace air pump 2B Technologies offers reasonably priced customer service for instrument repairs The calibration service includes cleaning of the entire flow path with methanol testing of all components for proper function installation of a new internal ozone scrubber and calibration against a NIST traceable standard The best way to contact us for service is to log a customer service ticket at www twobtech com techsupport Normally you will hear back from us by email within a few hours Or call us at 1 303 273 0559 Personal Ozone Monitor Manual Rev D 34 There is a great deal of technical information about our instruments posted as technical notes at www twobtech com downloads tech notes htm Manuals brochures software cleaning procedures and scientific papers may be downloaded at www twobtech com downloads POM htm Personal Ozone Monitor Manual Rev D 35 14 LABELLED PARTS GPS Antenna Battery Holder Figure 14 1 Front Cover of the POM Personal Ozone Monitor Manual Rev D 36 USB Connector Serial Port Figure 14 2 Top View Cell pump Connection Nafion Cell Connection Nafion Valve Connection Figu
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