Teledyne T265 manual Principles Of Operation, NO  O3  NO2*  O2, NO2*  NO2  hv

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5. PRINCIPLES OF OPERATION

5. PRINCIPLES OF OPERATION

The Teledyne API Model T265 analyzer is designed to measure the concentration of ozone using the chemiluminescence reaction below. The signal comes from the light emitted by the gas phase reaction of nitric oxide (NO) and ozone (O3) as follows:

NO O3  NO2* O2

NO2*  NO2 hv

The reaction of ozone with NO results in electronically excited NO2* molecules as shown in the first equation. The excited NO2* molecules release their excess energy by emitting a photon hν and dropping to a lower energy level as shown in the second equation. It has been shown that the number of emitted photons is directly proportional to the O3 concentration in the sample stream.

Calibration of the instrument is performed in software and usually does not require physical adjustments to the instrument. During calibration, the microprocessor measures the photo multiplier tube (PMT) signal when gases with known amounts of O3 are supplied, and stores these results in memory. The microprocessor uses these calibration values, along with the signal from the sample gas, the pressure readings for both the reaction cell and sample gas and box temperature in order to calculate a final concentration.

The product requires a cylinder of NO balanced in N2, which acts as the reagent gas. Both the electronic and pneumatic platforms are built using the current T series hardware. An additional precision regulator is added to keep the NO pressure constant, prior to the reaction cell. The internal pump draws sample through the sample dryer, removing ambient moisture, into the reaction cell. Periodically, an AutoZero valve switches the sample stream to the vacuum manifold, allowing the reaction cell to be evacuated and the analyzer to read zero background. The AutoZero readings are subtracted from the concentration readings, which improves zero baseline stability.

The analyzer uses two temperature-controlled critical orifices to deliver sample O3 and reagent NO into the reaction cell. See diagram of the pneumatic design in Figure 3-4.

07337B DCN6324

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Contents Model T265 Chemiluminescence Ozone Analyzer Manual AddendumTELEDYNE ADVANCED POLLUTION INSTRUMENTATION 9480 CARROLL PARK DRIVE SAN DIEGO, CA USAPage Phone IMPORTANT SAFETY INFORMATIONCustomer Service Department Email: api-customerservice@teledyne.comCONSIGNES DE SÉCURITÉ Description of Changes ABOUT THIS MANUALREVISION HISTORY 2011 December 07, Model T265 AddendumThis page intentionally left blank TABLE OF CONTENTS 07337B DCN6324 1.1 OVERVIEW 1. INTRODUCTIONIntroduction 2.SPECIFICATIONS, APPROVALS, & CERTIFICATIONS Table 2-1.Model T265 Specifications 2.2APPROVALS AND CERTIFICATIONS 2.3 WARRANTY2.2.1 Safety 2.1 EPA DESIGNATIONSpecifications, Approvals, & Certifications COULD DAMAGE INSTRUMENT AND VOID WARRANTY 3. GETTING STARTED3.1 UNPACKING Lift the cover straight up 3.2 INSTRUMENT LAYOUT 3.2.1 Front PanelFigure 3-1.Front Panel Figure 3-2.Rear Panel 3.2.2 Rear PanelFigure 3-3.Internal Chassis Layout 3.2.3 Internal Chassis Layout3.3.1Electrical and Pneumatic Connections 3.3 CONNECTIONS AND SETUPFigure 3-4.T265 Pneumatics, Basic Configuration 3.4.1 Startup 3.4.2Initial Calibrationcomponents to heat to operating temperature Step ActionComment Step 4. MAINTENANCE 4.1 MAINTENANCE SCHEDULE4.2MAINTENANCE ITEMS SPECIFIC TO THE MODEL T265 Maintenance 5. PRINCIPLES OF OPERATION NO  O3  NO2*  O2NO2*  NO2  hv Principles of Operation APPENDIX A Models T265 and 265E Menu Trees 07337B DCN6324 Press to cycle through the active warning 1Only appears when warning messages are active· · · · · · · · · · · · · · · · · APPENDIX A-1 Software Menu Trees Sample Menu07337B DCN6324 APPENDIX B - Spare Parts 07337B DCN6324 T265 Spare Parts List PARTNUMBERDESCRIPTION DESCRIPTION T265 Spare Parts ListReference 07388 06/01/2011 PARTNUMBERDESCRIPTION T265 Spare Parts ListReference 07388 06/01/2011, 15 PARTNUMBER07337B DCN6324 EMAIL api-customerservice@teledyne.com Appendix C Warranty/Repair QuestionnaireM265E and T265 Values are in the Signal I/OAppendix C Warranty/Repair Questionnaire M265E and T265APPENDIX D - Wire List and Electronic Schematics 07337B DCN6324 T265 INTERCONNECT LIST 07337B DCN6324 T265 INTERCONNECT LIST07337B DCN6324 T265 INTERCONNECT LIST07337B DCN6324 T265 INTERCONNECT LIST07337B DCN6324
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