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5 Maintenance

Model 7300A

5-6

Teledyne Analytical Instruments

5.6

Troubleshooting

5.7 General

This section contains information on the assembly and the electronic sections
of the Model 7300A Infrared Analyzer. The sample-handling sections of the
system are statistically low failure items and only require the maintenance as
pertinent to sample system operation (plugging, flowrates, leaks, etc.). Flow
system “failures” are usually of the nature that are easily resolved by
personnel familiar with basic mechanics of the Model 7300A flow system or
sample system.

The electronic sections are more complex, requiring the assistance of
personnel trained in electronics in the event of failure. The electronics
sections of the analyzers include advanced solid-state and digital circuitry
which requires a thorough understanding of circuit theory and
troubleshooting techniques.

NOTE
It is recommended that only qualified electronic technicians
troubleshoot electronic failures within the analyzers. Although
both analyzers contain plug-in printed circuit panels, service
personnel should be familiar both with the analyzer theory of
operation and the basics of analog circuit theory before
troubleshooting.

All basic customer electronic adjustments and calibrations of the analyzer
can be accomplished with a DC volt-ohm meter (preferably with a digital
readout). All circuit boards are of the plug-in replaceable type and only
require a DC voltmeter for set-up.

The following is a listing of parts needed for electronic calibration and
troubleshooting of the analyzers:
Accurate DC volt-ohm meter (digital readout) with clip-type leads

Miniature clip-type jumper leads (12" long)
Small blade screwdriver (TAI P/N S-190)

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Содержание 7300A

Страница 1: ...TINTHISMONITORINGSYSTEM PERSONALPROTECTIVEEQUIPMENTMAYBEREQUIREDWHENSERVICINGTHISSYSTEM HAZARDOUSVOLTAGESEXISTONCERTAINCOMPONENTSINTERNALLYWHICHMAYPERSISTFORA TIMEEVENAFTERTHEPOWERISTURNEDOFFANDDISCONNECTED ONLY AUTHORIZED PERSONNEL SHOULD CONDUCT MAINTENANCE AND OR SERVICING BEFORE CONDUCTINGANYMAINTENANCEORSERVICINGCONSULTWITHAUTHORIZEDSUPERVISOR MANAGER DANGER 7300 SERIES INFRA RED ANALYZER ...

Страница 2: ...ht of any parts in so far as such alterations do not adversely affect our warranty ImportantNotice This instrument provides measurement readings to its user and serves as a tool by which valuable data can be gathered The information provided by the instrument may assist the user in eliminating potential hazards caused by his process however it is essential that all personnel involved in the use of...

Страница 3: ...he analyzer APPLICATION IMPURITY OF INTEREST __________________ RANGE 1 FROM____________ TO___________ PPM circle one RANGE 2 FROM____________ TO___________ PPM circle one RANGE 3 FROM____________ TO___________ PPM circle one RANGE 4 FROM____________ TO___________ PPM circle one FILTER __________________ CALIB_FACTOR __________________ HARD_OFFSET_C __________________ HARD_OFFSET_F _______________...

Страница 4: ...iv Model 7300A Teledyne Analytical Instruments ...

Страница 5: ...i Table of Contents Teledyne Analytical Instruments OPERATING INSTRUCTIONS Model 7300A Infrared Gas Analyzer Table of Contents General Purpose ...

Страница 6: ...2 3 Calibration Gases 2 2 2 2 4 Pipe Connection 2 3 2 2 5 Sample Delivery System 2 3 2 2 6 Venting the System 2 3 2 3 Electrical Connections rear Panel 2 3 2 3 1 Primary Input Power 2 4 2 3 2 Fuse Installation 2 4 2 3 3 50 Pin Equipment Interface Connector 2 4 2 3 3 1 Analog Outputs 2 4 2 3 3 2 Alarm Relays 2 6 2 3 3 3 Digital Remote Cal Input 2 7 2 3 3 4 Range ID Relays 2 9 2 3 3 5 Network I O 2 ...

Страница 7: ...Controls 4 2 4 2 1 Mode Function Selection 4 2 4 2 1 1 Analysis Mode 4 2 4 2 1 2 Setup Mode 4 4 4 2 2 Data Entry 4 5 4 2 2 1 Enter 3 5 4 2 2 2 Escape 3 5 4 3 2 Setting up Auto Cal 4 6 4 3 3 Password Protection 4 7 4 3 3 1 Entering the Password 4 7 4 3 3 2 Installing or Changing the Password 4 8 4 3 4 Logging Out 4 9 4 3 5 System Self Diagnostic Test 4 9 4 3 6 The Model Screen 4 10 4 3 7 Checking L...

Страница 8: ...n 4 29 4 8 2 2 Manual Mode Linearization 4 30 4 8 2 3 Auto Mode Linearization 4 31 4 9 Special Function Setup 4 32 4 9 1 Offset Output Reverse Output 4 32 4 9 1 1 Output Signal Reversal 4 32 4 9 1 2 Output Signal Offset 4 33 4 9 2 Polarity Reversal 4 33 4 9 3 Gain Preset 4 34 5 Maintenance 5 0 Fuse Replacement 5 1 5 1 Routine Maintenance 5 2 5 2 Filter 5 2 5 3 NDIR Analyzer Measurement Cell 5 3 5 ...

Страница 9: ... Combustion and flue gas processes CO2 0 2 to 0 100 Pulp and paper CO 0 10 to 0 100 Vapor recovery systems CH4 0 10 to 0 100 Enhanced oil recovery C2 to C5 0 5 to 0 100 Food agriculture medical Liquid Analysis Metals ceramics and heat treating atmospheres Aromatics 0 5 up to 0 100 Landfill gas power stations MTBE ETBE TAME 0 20 Emissions testing part of the mobile stations Methanol Ethanol 0 15 Ca...

Страница 10: ...or spanning Auto Ranging allows analyzer to automatically select the proper preset range for a given measurement Manual override allows the user to lock onto a specific range of interest Twoadjustableconcentrationalarmsandasystemfailurealarm Extensive self diagnostic testing at startup and on demand with continuouspower supplymonitoring RS 232 serial digital port for use with a computer or other d...

Страница 11: ...rement of a compound using the 7300A is based on the Beer Lambert Law where the intensity of a beam of monochromatic radiation transmitted through a sample decreases exponentially as the con centration of the absorbing sample increases The use of two filters and detectors allows cancellation of energy changes due to turbidity dirty sample cell windows aging of the source and sudden temperature cha...

Страница 12: ...1 4 1 Introduction Model 7300A Teledyne Analytical Instruments ...

Страница 13: ...dinanareawherethe ambienttemperatureisnotpermittedtodropbelow32 Fnorriseabove100 F Inareasoutsidethesetemperatures auxillaryheating coolingmustbesupplied The7300A enclosureisoilanddustresistantthoughdesignedtoresistmoisture mustnotbeconsideredcompletelywater tight Mountingtowallsorracksmust be made securely Avoid locations that are subject to extreme vibration and sway Sufficientspacemustbeprovide...

Страница 14: ...ine neutral If you have the B option you will require 220 or 240 VAC 50 60 Hz power Check the analyzer input output diagram power schematic outline and wiring dia grams for incoming power specifications and connecting points Warning Primary power to the system should not be supplied until all customer wiring is inspected properly by start up personnel 2 2 3 Calibration Gases Thesystemmayrequireasu...

Страница 15: ...e sample corrosion as well as meet the area classification and Environmentalconditions 2 2 6 Venting the System Ingasanalysissystems thesystemventmanifoldorbypass samplevents must terminate in a safe area as the sample may be poisonous corrosive or flammable 2 3 Electrical Connections Rear Panel Figure 3 3 shows the Model 7300A rear panel There are connectors for power digital communications and b...

Страница 16: ...epts US or European size fuses A jumper replaces the fuse in whichever fuse receptacle is not used 2 3 3 50 Pin Equipment Interface Connector Figure 2 1 shows the pin layout of the Equipment Interface connector The arrangement is shown as seen when the viewer faces the rear panel of the analyzer The pin numbers for each input output function are given where each function is described in the paragr...

Страница 17: ...Range 0 1 V dc negative ground Examples The analog output signal has a voltage which depends on gas concen tration relative to the full scale of the range To relate the signal output to the actual concentration it is necessary to know what range the instrument is currently on especially when the analyzer is in the autoranging mode The signal output for concentration is linear over the currently se...

Страница 18: ...nternal alarm relay contacts Each set of three pins provides one set of Form C relay contacts Each relay has both normally open and normally closed contact connections The contact connections are shown in Table 2 4 They are capable of switching up to 3 amperes at 250 V ac into a resistive load The connectors are Threshold Alarm 1 Can be configured as high actuates when concen tration is above thre...

Страница 19: ...ormally open contact 36 System Alarm normally closed contact 20 System Alarm moving contact 37 System Alarm normally open contact 2 3 3 3 Digital Remote Cal Inputs Accept 0 V off or 24 V dc on inputs for remote control of calibra tion See Remote Calibration Protocol below See Table 2 5 for pin connections Zero Floating input A 5 to 24 V pulse input across the and pins puts the analyzer into the Ze...

Страница 20: ... zero or span command is sent and acknowledged contact closes release it If the command is continued until after the zero or span is complete the calibration will repeat and the Cal Relay Contact CRC will closeagain Forexample 1 Test the CRC When the CRC is open Send a zero command until the CRC closes The CRC will close quickly 2 When the CRC closes remove the zero command 3 When CRC opens again ...

Страница 21: ...ay Connections Pin Function 21 Range 1 ID Contact 38 Range 1 ID Contact 22 Range 2 ID Contact 39 Range 2 ID Contact 19 Range 3 ID Contact 18 Range 3 ID Contact 34 Range 4 ID Contact 35 Range 4 ID Contact 2 3 3 5 NetworkI O A serial digital input output for local network protocol At this printing this port is not yet functional It is to be used in future options to the instru ment Pins 13 and 29 2 ...

Страница 22: ... depending on the load impedance applied See Figure 2 8 Figure 3 6 FET Series Resistance 2 3 4 RS 232Port The digital signal output is a standard RS 232 serial communications port used to connect the analyzer to a computer terminal or other digital device It requires a standard 9 pin D connector Output The data output is status information in digital form updated every two seconds Status is report...

Страница 23: ...tion Table 2 9 lists certain RS 232 values that are required by the Model 7300A implementation Table 2 9 Required RS 232 Options Parameter Setting Baud 2400 Byte 8 bits Parity none Stop Bits 1 MessageInterval 2 seconds 2 4 Gas Requirements Instrument Air is required for zeroing of the Infrared Analyzer It must be free of oil particulates and water vapor that will not condensate unfiltered plant ai...

Страница 24: ...test it by performing the following operations 1 Repeat the Self Diagnostic Test section 5 2 2 6 Calibration 2 6 1 Calibration Fluids Zerofluidsmustbemadebythechemistrylaborcertifiedzeroandspan gasboughtfromagassupplier Thezerofluidmustbethemajorcomponentof the sample free from the component of interest Note In Non purity applications the reference cell may be sealed with clean air consult factory...

Страница 25: ...spureastheminimumresolution needed to control to This usually meets or exceeds the minimum full scale accuracy of the measurement 2 Introduce a span fluid and set the concentration of the span fluid Refer to the span procedure in section 4 4 2 Note The span gas should typically be an 80 of full scale range gas similar to the 100 zero gas background i e 100 CO 2 zero gas and a span gas of 98 4 CO2 ...

Страница 26: ...2 Installation Model 7300A 2 14 Teledyne Analytical Instruments ...

Страница 27: ...ll plug in circuit cards are firmly seated in their receptacles 3 Inspect and verify that all wiring connections are in agreement withthesystemInterconnectiondiagram 4 Check for correct span gases See 4 2 Preparation for Calibra tion 5 Check that sample pressure is regulated to 5 of nominal operatingpressure 6 Check and assure sample remains above dewpoint to eliminate any condensation from sample...

Страница 28: ...trol Unit of the instrument which houses the timer and operates the sampling system is called the master The other Control Units of the other instruments are called slaves Each of the other instruments may be monitoring the concentration of several different gases of interest in the sample for example CO CO2 and or Combustibles as CH4 in flue gas 3 2 2 Operational Calibration After the instrument ...

Страница 29: ... at 4 65 microns The more carbon monoxide present in the measurement cell the more energy its molecules absorb The NDIR analyzer needs four basic components to measure the spectral absorbance a A source of emitted infrared radiation to be absorbed by the gas of interest b A chamber opened to accept a flowing sample gas c A detector specifically tuned to measure only the wavelength of infrared ener...

Страница 30: ... second concave mirror onto a photon detector A spectral filter located just in front of the detector represents the precise window of the absorption band for the specific gas of interest Energy outside the band is eliminated The detector converts the optical energy from the radiant beams into an electrical signal which is modulated in proportion to the gas concentration Thermistor Heater Temperat...

Страница 31: ...elevatedtemperature The cell cavity allows the sample gases to pass between the IR source and the detector Sapphire cell windows allow passage of this IR energy with minimal absorption The gases that pass through the cell absorb energy of the IR band at different wavelengths within the spectrum An optical filter is mounted on the face of each detector Each detector responds to a particular wavelen...

Страница 32: ...1 U2 U3 and U4 Amplifiers U1 through U4 are high quality very low offset amplifiers Preamplified signals usually between 2 to 1 0 volt are delivered via the ribbon cable to the measuring board through an 8 point dip switch Connectors deliver power from the measuring board to the amplifiers and 300 450 mADC current to the IR source The motherboard serves as a power distribution and interface board ...

Страница 33: ...he RS 232 port provides two way serial digital communications to and from the CPU These and all of the above electrical interface signals are described in detail in chapter 3 Installation 3 6 Linearizer The output of the NDIR analyzer bench is non linear this is due to the effect known as Beers Law Figure I shows this non linear response In order to produce a linear signal response a compensation ...

Страница 34: ... be required to compensate for the nonlinearity of the bench The points at which the compensation curve changes slope are called breakpoints The slope of each segment corresponds to the gain of the linearizer in that segment and this gain has to vary according to the input voltage This is achieved through software by adjusting a multiplier factor at each straight line segment The linearizer has ni...

Страница 35: ...play may swing from below zero to above fullscale several times before it finally settles to zero output The hold feature prevents these wide output excursions from affecting the analog output and trigger alarms The Auto Zero circuit board function takes about 6 minutes to complete It is important that zero gas is continually purging the cell during this time 4 At around the 5th minute the Auto Ze...

Страница 36: ...3 Start up and Theory of Operation Model 7300A 3 10 Teledyne Analytical Instruments ...

Страница 37: ...an automatic calibration cycle if desired RoutineOperation Calibratetheinstrument Choose autoranging or select a fixed range of analysis Set alarm setpoints and modes of alarm operation latching fail safe etc Program Reprogramtheanalyzer Define new applications Linearize your ranges Specialfunctionssetup Set output reversal Set polarity reversal or offset output S Setgainamplification Before you c...

Страница 38: ...e The ANALYZEscreenistheonlyscreenoftheAnalysisMode TheMAINMENUscreenisthetoplevelinaseriesofscreensusedinthe SetupModetoconfiguretheanalyzerforthespecificapplication TheDOWN UPcommandsscrollthroughtheoptionsdisplayedontheVFDscreen The selectableoptionappearsbetweenarrows Whenyoureachthedesiredoption byscrolling ENTERtheselectionasdescribedbelow ESCAPEtakesyoubackupthehierarchyofscreensuntilyourea...

Страница 39: ...RO Auto Manual Zero Select Zero in Progress ALARMS Gas Use Range ppm Select Select Range Setpoints Attributes RANGE Auto Manual Range Adj Gas Application Auto Define Range Select Range Man Troublsho oting Data HARDW VAR Select Range Define Appl Range APPLICATION Select Range Gas Use Range Select Verify Setup Verify Points Enter Auto Manual Linearity Cal Input Output Values Select Linrty Span Value...

Страница 40: ...ion 8 ALARMS Used to set the alarm setpoints and determine whether each alarm will be active or defeated HI or LO acting latching or not and failsafe or not 9 RANGE Used to set up three analysis ranges that can be switched automatically with auto ranging or used as individual fixedranges 10 HARDW VAR This function displays parameters used by the software for some calculations It is a troubleshooti...

Страница 41: ...heron Allofthesefunctionsaredescribedingreaterdetailintheprocedures startinginsection4 3 TheVFDscreentextsusedtoillustratetheprocedures are reproduced in a Monospaced type style 4 2 2 Data Entry 4 2 2 1 ENTER WhentheselectedoptionisafunctionontheMainMenuscreen the functionnameappearsbetweenthearrowsonthescreen Youactivatethe functionbytheENTERkey Whentheselectedoptionisafunctionorsubfunction ENTER...

Страница 42: ...re possible The internal clock in the Model 7300A is accurate to 2 3 Accordingly internally scheduled calibrations can vary 2 3 per day Note If your ranges are configured for different applications then AUTO CAL will calibrate all of the ranges simultaneously by calibrating the Cal Range TosetupanAUTO CALcycle TheVFDwilldisplayfivesubfunctions CalloutMAINMENU scrolltoAUTO CALfunction andENTER A ne...

Страница 43: ...te safe location 4 3 3 1 EnteringthePassword Toinstallanewpasswordorchangeapreviouslyinstalledpassword you mustkeyinandENTERtheoldpasswordfirst Ifthedefaultpasswordisin effect pressingtheENTERbuttonwillenterthedefaultTAIpasswordforyou CalloutMAINMENUsetupbyselectinganycontrols Use the UP or DOWN key to scroll the blinking over to PSWD and press Entertoselectthepasswordfunction EitherthedefaultTAIp...

Страница 44: ...orthepreviously assignedpassword orpressEscapetokeeptheexistingpasswordandmove on IfyouchoseEntertochangethepassword thepasswordassignment screenappears Select new password T A I or Select new password AAA EnterthepasswordusingtheUPorDOWNkeysandENTERtoscroll throughtheexistingpasswordletters andtheUPorDOWNkeystochangethe letterstothenewpassword Thefullsetof94charactersavailableforpassword usearesh...

Страница 45: ...word to gain access to Alarm and Range functions 4 3 4 Logging Out TheLOGOUTfunction providesaconvenientmeansofleavingtheanalyzer inapasswordprotectedmodewithouthavingtoshuttheinstrumentoff By enteringLOGOUT youeffectivelylogofftheinstrumentleavingthesystem protectedagainstuseuntilthepasswordisreentered Tologout scrolltofieldof LOGOUTfunction andENTERtologoutThescreenwilldisplaythemessage Protecte...

Страница 46: ...icatesaprobleminaspecificareaoftheinstrument RefertoChapter5 MaintenanceandTroubleshootingfornumber codeinformation Theresults screenalternatesforatimewith Press Any Key To Continue ThentheanalyzerreturnstotheinitialSystemscreen 4 3 6 The Model Screen ScrollthroughtheMAINMENUtoMODELandEnter Thescreen displaysthemanufacturer model andsoftwareversioninformation 4 3 7 Checking Linearity with ALGORITH...

Страница 47: ...asesastherewillbecorrectionpointsalongthe curve Theuserdecidesonthenumberofpoints basedontheprecisionre quired Themanualmodeonlyrequiresenteringthevaluesforeachcorrection pointintothemicroprocessorviathefrontpanelbuttons Again thenumberof pointsrequiredisdeterminedbytheuser 4 3 8 Troubleshooting information AccessingtheHARDW_VARfunctionwillallowaqualifiedtechnician togetfurtherinformationontheheal...

Страница 48: ...oaccessthedigitalfiltersetup scrollthroughthemenuandselect FILTER PresstheEnterkeytoseethefollowingscreen Enter Digital Filter 4 Thenumberonthesecondrowcanbeadjustedfrom0 minimumdigital filtering to10 maximumdigitalfiltering Thedefaultsettingis4andthatshould sufficeformostapplications Insomeapplicationswherespeedingtheresponse timewithsometradeoffinnoiseisofvalue theoperatorcoulddecreasethe number...

Страница 49: ...hroughoutitsworkingrange Thus theneedtoprovideanoffset whentheinstrumentisbeingzeroed Howtoaccesstheoffsetfunction Toaccessthisfunction ScrollthroughthemenuandselectOFFSET PresstheEnterkeytoseethefollowingscreen Enterzerooffset 0 00 TheoffsetvaluecanbemodifiedbyusingtheUp Downkeys Nextsection showshowtoselectthisvalue Sufficetosaythatwhatevervalueyouenter will beautomaticallyaddedtothereading Thus...

Страница 50: ...alyzeroperation Reintroducethezero calibrationgas EnterthezeroOffsetvalueasexplainedabove 6 Checkthattheinstrumentreadstheenteredoffset 7 Reintroducetheprocessbackgroundgasmixtothe7300Asamplecell intheAnalyzemode Itshouldreadclosetozerooncethereadingisstable 1 erroroffullscale Spanningthe7300A Sincetheinstrumentmightbespannedwithabackgroundgasthesame asthezerocalibrationgas thespanvaluetobeentered...

Страница 51: ...e default setting is NO That means the 4 to 20 madc and 0 1 vdc are linearandshownodiscontinuitiesthroughoutitsrangeofoperation approxi matelyfrom2 4madcto21 6madc IfyouswitchittoYESbyusingUpor Downkeys theoutputofthe4to20madcwillconformtoNAMURstandard NE43 Ifselected theoutputofthe2to20madcwillexhibitabreakdownat readingsbelow3 8madcandabove20 5madcapproximately Thesebreak downs indicateafailureo...

Страница 52: ...e before calibrat ing if your analyzer has been disconnected from its power source This does not apply if the analyzer was plugged in but was in STANDBY Theanalyzeriscalibratedusingreference zero andspangases Gas requirementsarecoveredindetailinchapter3 section3 4GasConnections Checkthatcalibrationgasesareconnectedtotheanalyzeraccordingtothe instructionsinsection3 4 observingalltheprescribedprecau...

Страница 53: ...ressEntertobeginzeroing CO2 Slope C Zero Thebeginningzerolevelisshownintheupperleftcornerofthedisplay As thezeroreadingsettles thescreendisplaysandupdatesinformationonSlope in ppm second unlesstheSlopestartswithintheacceptablezerorangeanddoes notneedtosettlefurther Thesystemfirstdoesacoursezero showninthe lowerrightcornerofthescreenasC Zero forapproximate3 min andthendoes afinezero anddisplaysF Ze...

Страница 54: ...isplayedZeroadj value as closeaspossibletozero Then pressEnter S Zerostarts DuringS Zero theMicrocontrollertakescontrolasinAuto ModeZeroing above Itcalculatesthedifferencesbetweensuccessivesam plingsanddisplaystherateofchangeasSlope avalueinpartspermillionper second ppm s CO2 Slope S Zero Generally youhaveagoodzerowhenSlopeislessthan0 05ppm sfor about30seconds Oncezerosettlingcompletes theinformat...

Страница 55: ...maticormanualmode CAUTION If you are spanning the Cal Range by itself multiple application analyzers only use manual mode zeroing If you want to calibrate ALL of the ranges at once multiple application analyzers only use auto mode spanning in the Cal Range Makesurethespangasisflowingtotheinstrument 4 4 2 1 AutoModeSpanning Observeallprecautionsinsections4 4and4 4 2 above ScrollSPANand enterthespan...

Страница 56: ...dautomaticallyormanually Select span mode MANUAL UsetheUP DOWNkeytotogglebetweenAUTOand MANspansetting StopwhenMANappears blinking onthedisplay ENTERtomovetonext subfunctionscreen Span Val 2Ø ØØ ENT To begin span UsingtheUP DOWNkeychangesthespanvalue asnecessary Enterto movetotheunitsfield ppm UseUP DOWNkeytoselectunit PressEntertoenterthespanvalueintothesystemandbeginthespan calibration Oncethesp...

Страница 57: ...red Thechoicewilldepend uponyourprocess Considerthefollowingfourpoints 1 Which if any of the alarms are to be high alarms and which if any are to be low alarms Setting an alarm as HIGH triggers the alarm when the contaminant concentration rises above the setpoint Setting an alarm as LOW triggers the alarm when the contaminant concentration falls below the setpoint Decide whether you want the alarm...

Страница 58: ...ges are for the same application set any one of them will automatically set the others PresstheAlarmbuttononthefrontpaneltoentertheAlarmfunction Makesurethat01isblinking Sel rng to set alm Ø1 Ø2 Ø3 SetuptheRange1alarmbymovingtheblinkingoverto01usingtheUP DOWNarrowkeys ThenEnter Checkthegasapplicationandrangelimitsas displayedonthescreen Gas use CO2 Range 0 10 Pressenteragaintosetthealarmsetpoints ...

Страница 59: ...heconcentration range ofanalysis MANUAL ortoselectautomaticrangeswitching AUTO IntheMANUALscreen youarefurtherallowedtodefinethehighandlow concentration limitsofeachRange andselectasingle fixedrangetorun CAUTION If this is a linearized application the new range must be within the limits previously programmed using the System function if linearization is to apply through out the range Furthermore i...

Страница 60: ...utorangingwillautomaticallysettotheapplicationthathasatleasttwo rangesetupwiththesamegases Intheautorangingmode themicroprocessorautomaticallyrespondsto concentrationchangesbyswitchingrangesforoptimumreadoutsensitivity Ifthe upperlimitoftheoperatingrangeisreached theinstrumentautomaticallyshifts tothenexthigherrange Iftheconcentrationfallstobelow85 offullscaleof thenextlowerrange theinstrumentswit...

Страница 61: ...s are currently defined for different applica tion gases then the above screen does not display because mode must be manual Ifabovescreendisplays usetheUP DOWNkeytoSelectAUTO and Enter PressEscapetoreturntothepreviousAnalyzeFunction 4 6 3 Precautions TheModel7300Aallowsagreatdealofflexibilityinchoosingrangesfor automaticrangeswitching However therearesomepitfallsthataretobe avoided Rangesthatworkw...

Страница 62: ...oswitchestheanalyzerbacktotheAnalyze function Alternatively ifyouleaveyouranalyzeronMAINMENUscreen within5secondswithouttouchinganykey itwillautomaticalyreturntoanalyze function Iftheanalyzerisinsubfunctionmode inmostcases itwill automaticalyreturntoanalyzemodewithin10minutes TheAnalyzefunctionscreenshowstheimpurityconcentrationandthe applicationgasesinthefirstline andtherangeinthesecondline Inthe...

Страница 63: ...heSetApplicationscreenallowsreprogrammingofthethreeanalysis rangesandthecalibrationrange includingimpuritygas backgroundgas low endofrange highendofrange and orppmunits Originalprogrammingis usuallydoneatthefactoryaccordingtothecustomer sapplication Itmustbe donethroughtheRS 232portusingacomputerrunningaterminalemulation program Note It is important to distinguish between this System program ming ...

Страница 64: ...fectedbythefixedrange Theycontinuetoreadbeyondthefull scale settinguntilamplifiersaturationisreached Belowamplifiersaturation theover rangereadingsareaccurateUNLESStheapplicationuseslinearizationoverthe selectedrange Toprogramtheranges youmustfirstperformthefourstepsindicatedat thebeginningofsection4 8Programming YouwillthenbeintheMAIN MENUandselectingapplicationfunctionscreen Sel rng to set appl ...

Страница 65: ...d regardless of the analog output range Toendthesession send st enter st enter totheanalyzerfromthecomputer 4 8 2 The Curve Algorithm Screen TheCurveAlgorithmisalinearizationmethod Itprovidesfrom1to9 intermediatepointsbetweentheZEROandSPANvalues whichcanbenormal izedduringcalibration toensureastraight lineinput outputtransferfunction through the analyzer Before setting the alogorithm curve each ra...

Страница 66: ...ationgasesastherewillbecorrectionpointsalongthe curve Theuserdecidesonthenumberofpoints basedontheprecisionre quired Themanualmodeonlyrequiresenteringthevaluesforeachcorrection pointintothemicroprocessorviathefrontpanelbuttons Again thenumberof pointsrequiredisdeterminedbytheuser Note Before performing section 4 8 2 or 4 8 2 3 you must check to ensure that your calibration gases or points are betw...

Страница 67: ...ion usetheUP DOWN keystosetthepropervaluesateachpoint Dpt INPUT OUTPUT 0 Ø ØØ Ø ØØ Repeattheaboveprocedureforeachofthedatapointsyouaresetting up toninepoints 0 8 Setthepointsinunitincrements Donotskipnumbers The linearizerwillautomaticallyadjustforthenumberofpointsentered When you are done ESCAPE The message Completed Wait for calcula tion appearsbriefly andthenthemainSystemscreenreturns Toendthes...

Страница 68: ...ntheses 6 Repeat step 5 for each of the special calibration gases from the lowest to the highest concentrations Escape when done Toendthesession send st enter st enter totheanalyzerfromthecomputer 4 9 Special Function Setup CAUTION The programming functions of the output signal reversal polarity reversal and gain preset are config ured at the factory to the users application specifica tion These f...

Страница 69: ...mplegasof40 50 CO2 innitrogen normallyzerogasofthisapplicationrequires40 CO2 innitrogen However 100 ofnitrogencanbeusedtozerotheanalyzer Inthiscase theoutput offsetisnotneededtosetup Forlinearoutputtheaccuracywillaccesssuccess fullywithin 1 off But iftheapplicationisanalyzingthesamplegasthatis notlinearly theaccuracyoftheanalyzermaynotmeetthespecification There fore outputoffsetisrequiredand40 CO2...

Страница 70: ...s feature you must have a span gas containing 90 100 of the lowest range of the analyzer 1 Setunitrangetolowestrange NOTE For output reversal the lowest range should be range 3 else the lowest range is range 1 2 Connectspangastospaninlet 3 UseUP DOWNkeytoscrolltotheCAL INDEPDfunction 4 HoldEscape EntercontroltoENTERpositionforapproximately10 secondsuntiltheupperrightconnectdisplay ok message 5 Use...

Страница 71: ...s andrecalibration WARNING SEE WARNINGS ON THE TITLE PAGE OF THIS MANUAL 5 0 Replacing the Fuse Remove Power to Unit before replacing the fuse 1 Place small screwdriver in notch and pry cover off as shown in Figure 5 1 Figure 5 1 Removing Fuse Block from Housing 2 To change between American and European fuses remove the single retaining screw flip Fuse Block over 180 degrees and replacescrew 3 Rep...

Страница 72: ...ibration schedule should include recording of the zero and span pot values for performance trends Clogging of the sample system and other system problems will usually show early symptoms during online analysis or during calibration Problems with the system not due to the normal processing of the sample are sometimes failures which must be corrected 5 2 Filter The system filter element if included ...

Страница 73: ...ter and alcohol and dried thoroughly before reassembly Sealed cells can be blown out with air washed or replaced C After the cells have been cleaned and thoroughly dried reassemble them into the optical bench Also attach any disconnected wiring back onto the bench and check all connections and fasteners D Turn on the analyzer and allow it to warmÄup for at least ten minutes Check for zero and span...

Страница 74: ... 5 5 Major Internal Components All internal components are accessed by unbolting and pulling open the rack assembly removing the front cover as described earlier The major internal component locations are shown in Figure 5 3 the cell block is illustrated in Figures 5 2 5 3 and the fuse receptacle is shown in Figure 5 1 The 7300A contains the following major internal components Customer Interface P...

Страница 75: ...Teledyne Analytical Instruments Figure 5 3 Cell Assembly WARNING HAZARDOUS VOLTAGES EXIST ON CERTAIN COMPONENTS INTERNALLY WHICH MAY PER SIST FOR A TIME EVEN AFTER THE POWER IS TURNED OFF AND DISCONNECTED Figure 5 4 Major Internal Components ...

Страница 76: ...d state and digital circuitry which requires a thorough understanding of circuit theory and troubleshootingtechniques NOTE It is recommended that only qualified electronic technicians troubleshoot electronic failures within the analyzers Although both analyzers contain plug in printed circuit panels service personnel should be familiar both with the analyzer theory of operation and the basics of a...

Страница 77: ...can be hazar dous Check for loose connec tion to one of the terminal board lugs replace as required B No Zero Control with a Check that Power is ON unit on Zero gas Out put is either dead or fully saturated b Check that power supply voltages are correct 15VDC Ä15VDC c Check output of TP6 on preamp board with a DC voltmeter should be less than or Ä 3VDC If output can be zeroed check volt ages at TP...

Страница 78: ...urce is operating If no light check source elementresistanceandconnections D Meter Up Scale or a Redo full calibarion Overscale b Check for obstruction in sample beam path c Check for excessive moisture in plumbing and sample chamber Clean and replace sample chamber E Insufficient Span a Recheck zero for excessive off Control with span gas set b Check modulation factor using certified span gas F N...

Страница 79: ...5 5 9 Teledyne Analytical Instruments b Chopper hitting housing c Noisy detector d AC pickup at printed circuit board e Optical unit not grounded to cabinet f Detector connections loose g Faultypreamplifierboard h Contamination in cell ...

Страница 80: ...5 Maintenance Model 7300A 5 10 Teledyne Analytical Instruments ...

Страница 81: ...VDC negative ground Alarm Dual Alarm Relay Mounting General Purpose OperatingTemperature 5 45o C 41 113o F SampleTemperature 5 45o C 41 113o F Accuracy 2 of full scale at constant temperature Linearity 2 of full scale Repeatability 1 of full scale Drift 1 of full scale per week at constant tem perature Response Time 90 of full scale in less than 5 seconds SpanStability Less than 1 of full scale ch...

Страница 82: ...0 Landfill gas power stations MTBE ETBE TAME 0 20 Emissions testing part of the mobile stations Methanol Ethanol 0 15 Carbon dioxide scrubber efficiency Isobutanes 0 75 CO CO2 C2H4 monitoring in oxyhydrochlorination Benzene 0 5 process in EDC manufacturing Water in solvents 0 5 For lower ranges and other liquids or gases contact factory Drawing List D 72874 OutlineDiagram D 67447 SchematicsDiagram...

Страница 83: ...nt 1 C 62374A Back Panel Assy Model 7300 7300A Bulk Head Mount 1 C69535A Temperature Control PCB Assy 115VAC 1 C69535B Temperature Control PCB Assy 220VAC 1 B58206 Source Lamp Assy 2 O205 O ring Viton 2 W76 Window 2 F1275 Fuse 1 A 33748 THERMISTOR ASSY Note Orders for replacement parts should include the part number if available and the model and serial number of the instru ment for which the part...

Страница 84: ...ure of the sample from the take off thorough the sample cell must be maintained above its dew point to prevent any moisture or vapor pressure for other possible condensables mists from occurring and affecting instrument performance Loss of CO2 or other soluble gases 6 The sample temperature should not vary at the inlet more than 15 O C of the calibration temperature nor exceed the design operating...

Страница 85: ... materials may be required 11 Teledyne is not responsible for applying a general purpose instrument in a hazardous area or where a flammable gas is brought to an ana lyzer above its lower explosive limit and the area has been classified as general purpose 12 Customer must supply the necessary calibration gases at the required purities 13 Customer must auto zero and span calibrate as specified in t...

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