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2B Technologies POM, Operation Manual

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Personal Ozone Monitor Manual Rev. E-2 

i 

 

 

 

 

Personal Ozone Monitor

™ 

 

2

B

 

Technologies, Inc.

 

 

 

 

 
 

OPERATION MANUAL 

 

Model POM

™

 

 
 

© Copyright 2016, 2B Technologies, Inc. 

All rights reserved. 

 

 

Technical Support:  

www.twobtech.com/techsupport 

 [email protected]

 

+1(303)273-0559 

 

Summary of Contents for POM

Page 1: ...nual Rev E 2 i Personal Ozone Monitor 2B Technologies Inc OPERATION MANUAL Model POM Copyright 2016 2B Technologies Inc All rights reserved Technical Support www twobtech com techsupport techsupport twobtech com 1 303 273 0559 ...

Page 2: ...NU 10 5 1 Menu Tree 10 5 2 Data Averaging and Data Logging Using the Menu 11 5 3 Navigating the Front Panel Menu 11 5 4 Entering the Front Panel Menu 11 5 5 Acquiring Data without Logging 11 5 6 To Begin Logging Data 12 5 7 To Stop Logging Data 13 5 8 To Average Data 14 5 9 Capturing the Transmitted Logged Data Using the USB or Serial Port 14 5 10 To Set the Calibration Parameters 15 5 11 To Set t...

Page 3: ...e Loss Test 27 11 4 3 Linearity Check 27 11 4 4 Intercomparison Test 28 12 CALIBRATION PROCEDURE 28 12 1 Instrument Preparation 28 12 2 Measurement of Zero Air 28 12 3 Measurement of Ozone Standards 29 12 4 Calibration Curve 29 12 5 Periodic Zero and Span Checks 29 13 MAINTENANCE TROUBLESHOOTING 31 14 LABELED INSTRUMENT PHOTOS 34 15 PARTS LIST 37 16 SERVICE LOG 38 Appendix A Using the 2B Technolog...

Page 4: ... Manual Rev E 2 iv IDENTIFICATION RECORDS Record the following information for future reference Serial number ______________________________________ Warranty start date _______________________________________ date of receipt ...

Page 5: ... to Equation 2 on page 2 added information in Sections 5 6 5 8 and 5 10 minor formatting changes TRADEMARKS 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 ma...

Page 6: ...t 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 prov...

Page 7: ...B 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 accur...

Page 8: ...IS Vor dem Öffnen des Gerätes Netzstecker ziehen WARNHINWEIS Dieses auf dem Gerät weist darauf hin dab der Anwender zuerst das entsprechende Kapitel in der Bedienungsanleitung lesen sollte WARNHINWEIS Wenn das Gerät nicht wie durch die Firma 2B Technologies Inc USA vorgeschrieben und im Handbuch beschrieben betrieben wird können die im Gerät eingebauten Schutzvorrichtungen beeinträchtigt werden IT...

Page 9: ...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 occu...

Page 10: ...fficient 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 the concentration of molecules M in the detection cell Ozone in uni...

Page 11: ...orption 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...

Page 12: ...bout 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 5 of the average in the long filter The lengths of the long an...

Page 13: ...e same path length in the POM as in the Models 202 205 and 106 L and thus have similar precision and accuracy 1 5 ppb or better The POM s many possible applications include 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 b...

Page 14: ...ft 1 day 3 year Measurement Time Frequency 10 s 0 1 Hz Fast mode 2s 0 5 Hz Response Time 100 of Step Change For 10 s output 20 s 2 data points For 2 s output 4s 2 data points Data Averaging Options 1 min 5 min 1 hr Data Storage 8 192 lines 2 s fast mode 4 6 hrs 10 s meas mode 1 day 1 min avg 6 days 5 min avg 1 mo 1 hr avg 1 yr Ozone Units ppb Pressure Units torr Temperature Units K T and P Correct...

Page 15: ...al 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 Also for safety purpo...

Page 16: ...been turned on long enough for the internal temperature to stabilize The observed offset which can amount to a few ppb can be corrected for by changing the offset calibration parameter Z from the front panel as described in Section 5 10 below 3 4 Collecting Data over the USB Port or Serial Port in Real Time To transmit data to a computer over the USB port or the serial port in real time connect th...

Page 17: ...ard GPS unit that 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 ...

Page 18: ...EL MENU 5 1 Menu Tree The following diagram summarizes the complete instrument Menu accessed via the LCD Select and Move buttons Main Menu Dat Avg Cfg Lmp 1h 10s 5m Log End Xmt D T Cal Bat Gps D T 10 32 21 14 10 2009 Cfg 1m 2s Figure 5 1 Instrument Menu ...

Page 19: ... by 16 character LCD screen and two push buttons that are located below the LCD screen see Fig 14 1 below The curved arrow or Select button is used to enter and exit menus and for selecting values The right pointing arrow or Move button is used 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 i...

Page 20: ...e seconds later this display might be followed by O3 31 1 ppb 19 55 23 05 16 showing that the time of the measurement is 7 55 pm and the date is 23 May 2016 If averaging of 1 min 5 min or 1 hr has been selected see Section 5 8 below the above display will be replaced by Avg O3 24 1 ppb 19 55 23 05 16 for example where the most recent average value of ozone computed is 24 1 ppb At the end of an ave...

Page 21: ... more 10 s measurements need to be made before a new average is displayed and logged Note that entering the menu will interrupt the averaging interval that is in progress and the averaging interval will start over when the menu is exited and measuring is resumed 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 Interr...

Page 22: ...9 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 See Appendix A for a description of working with this software Alternat...

Page 23: ...s 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 0 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 consistentl...

Page 24: ...ral 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 adv...

Page 25: ...age 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 deviation of the m...

Page 26: ... accessed via the serial port or the USB using the 2B Technologies Data Display software see Appendix A or a terminal emulator such as Tera Term 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 USB Port or Serial Port in Real Time Section 3 4 Listed below ...

Page 27: ...r x to return to the menu and then to measuring n Outputs the serial number of the instrument f Sets pump mode to FAST 2 second cycles q Sets pump mode to QUIET 4 second cycles b Displays current Adaptive filter difference and waits for new setting followed by a carriage return Factory default setting is 15 i Displays current Adaptive filter percent and waits for new setting followed by a carriage...

Page 28: ...ware htm 9 2 Driver Installation 1 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 2 The installation files are located in a zip folder Navigate to the folder labeled cdc_NTXP and double click on it 3 Unzip the contents to a folder on the desktop or any area you wish 4 With the POM off attach USB cable from the POM to a US...

Page 29: ...Personal Ozone Monitor Manual Rev E 2 21 7 Navigate to folder where you unzipped the cdc_NTXP 8 Select Continue Anyway when this window appears ...

Page 30: ...Personal Ozone Monitor Manual Rev E 2 22 9 After a few seconds the driver will be finished installing ...

Page 31: ... 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 10 XP Vista 7 8 go to the control panel and select System 2 Click on the Hardware tab 3 Click the Device Manager button 4 Press the sign next to Ports ...

Page 32: ... the POM 10 2 Using the Connection Plug the USB cable in after the powering the POM to ensure correct functionality When setting up your software or terminal emulator choose the correct COM port listed in the Device manager Use these baud rate settings 19200 8 bits no parity 1 stop bit Use 2B Technologies Display and Graphing Software free download from http twobtech com downloads_software htm to ...

Page 33: ...e to loss of ozone over time When ozone concentration standards are required the ozone must be generated and certified on site The following information is based on EPA requirements for calibrations of ozone monitors for monitoring in compliance with the U S Clean Air Act Similar procedures are recommended for other applications as well Ozone standards can be classified into two basic types 1 A Pr...

Page 34: ...e 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 3 Instrument Preparation Prior to calibration follow the steps below 1 Turn on the Personal Ozone Monit...

Page 35: ...dard 11 4 3 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 Section 12 4 Calibration Procedure Calibration Curve or by dilution of an ozone measurement To check the instrument linearity by dilut...

Page 36: ...ice Alternatively the user may perform the calibration using the suggested procedure below 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 setu...

Page 37: ...ndication of an error in determining the calibration curve The error may be due to the calibration setup or the Personal Ozone 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 this manual Section 13 4 The inverse of the slope of the line 1 m...

Page 38: ...e Measurement of Ozone Standards Section 12 3 above 3 Average measurements from the zero check or span check should 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...

Page 39: ...he 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 Pa...

Page 40: ...cleaning Required calibration parameters are large 9 ppb offset and or 9 slope when calibrated using a standard ozone source or reliable ozone instrument Internal ozone scrubber is contaminated Flow path is contaminated Solenoid valve is contaminated and not opening and closing properly Air pump is not drawing sufficient flow Return the instrument to 2B Tech for replacement of the internal ozone s...

Page 41: ...ibration 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 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...

Page 42: ...Personal Ozone Monitor Manual Rev E 2 34 14 LABELED INSTRUMENT PHOTOS Figure 14 1 Front Cover of the POM Select Scroll LCD Inlet Exhaust Battery GPS Antenna Battery Holder ...

Page 43: ... Ozone Monitor Manual Rev E 2 35 Figure 14 2 Top View Figure 14 3 Inside View DewLineTM Cell Connection DewLineTM Valve Connection Power Switch USB Connector Serial Port Power In Belt Clip Cell pump Connection ...

Page 44: ...hout Nafion DewLineTM Figure 14 5 Inside view without Scrubber or Nafion DewLineTM Inlet Connection Ozone Scrubber Scrubber Valve_NO Connection Scrubber Valve_NC Connection Photodiode UV Lamp GPS Clock Battery 3 3V Pump Absorption Cell Temperature Sensor Pressure Sensor ...

Page 45: ...or a full and updated list of parts and pricing for the Personal Ozone Monitor http twobtech com parts online html It is recommended that the instrument be sent to 2B Technologies servicing of any internal parts Part Number Description ZEREXTPOM Ozone zeroing scrubber external SERCABLPOM Serial port cable to computer USBMNICABL Mini USB Cable to computer 12VADP 12 V DC cigarette lighter adapter TE...

Page 46: ...Personal Ozone Monitor Manual Rev E 2 38 16 SERVICE LOG Date Hours Calibrated Cleaned New O3 Scrubber New Pump main New Lamp Other ...

Page 47: ...Personal Ozone Monitor Manual Rev E 2 39 Date Hours Calibrated Cleaned New O3 Scrubber New Pump main New Lamp Other ...

Page 48: ...tware Follow the instructions doing the two installations if needed and choosing to save the setup exe file Double click the setup exe download to launch the 2B Data Display application Connecting Devices Connect to a Monitor 1 Select the device you are connecting to from Settings Select Device 2 Click OK 3 Select the Connection you will be using from Settings Connection Choose the settings as fol...

Page 49: ...ther Link menu A window will appear and the software will try to retrieve the weather station data If the connection is good weather data will be displayed in the window If not an error message will appear Try a different com port if the error message appears You may move this window so it is out of the way or you may close it The weather data is updated every 5 seconds Since the Monitor and the W...

Page 50: ...ta Grid or the Charts click on the Buffer tab to view the serial data If the correct device is not selected no data will be displayed in the Data Grid or the Charts but data will be displayed in the Buffer window Saving Data Saving Data to a txt File 1 Click the Start button in the Instrument Data Section to begin collecting data from the instrument 2 A window will pop up to prompt for the name an...

Page 51: ...you must open the corresponding CSV file 4 Choose the correct device associated with the file a If you are unsure open the file in a text editor or Excel to determine which device Serial and USB Commands The menu commands are the same as given in Section 8 of this manual ...

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