OPERATING INSTRUCTIONS FOR
Model 3300PA
Percent Oxygen Analyzer
SERIES 3300 PERCENT OXYGEN
SAMPLE
SPAN
Teledyne Analytical Instruments
DANGER
HIGHLY TOXIC AND OR FLAMMABLE LIQUIDS OR GASES MAY BE PRESENT IN THIS MONITORING
SYSTEM.
PERSONAL PROTECTIVE EQUIPMENT MAY BE REQUIRED WHEN SERVICING THIS SYSTEM.
HAZARDOUS VOLTAGES EXIST ON CERTAIN COMPONENTS INTERNALLY WHICH MAY PERSIST
FOR A TIME EVEN AFTER THE POWER IS TURNED OFF AND DISCONNECTED.
P/NM69127
08/06/99
ECO#99-0323
ONLYAUTHORIZEDPERSONNELSHOULDCONDUCTMAINTENANCEAND/ORSERVICING. BEFORE
CONDUCTING ANY MAINTENANCE OR SERVICING CONSULT WITH AUTHORIZED SUPERVISOR/
MANAGER.
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Contents
Introduction
1.1 Overview........................................................................ 1-1
1.2 Main Features of the Analyzer ....................................... 1-1
1.3 Front Panel Description.................................................. 1-2
1.4 Rear Panel Description .................................................. 1-3
OperationalTheory
2.1 Introduction .................................................................... 2-1
2.2 Micro-Fuel Cell Sensor .................................................. 2-1
2.2.1 Principles of Operation .......................................... 2-1
2.2.2 Anatomy of a Micro-Fuel Cell................................. 2-2
2.2.3 Electrochemical Reactions .................................... 2-3
2.2.4 The Effect of Pressure............................................ 2-3
2.2.5 Calibration Characteristics ...................................... 2-4
2.3 Electronics ..................................................................... 2-5
2.3.1 General .................................................................. 2-5
2.3.2 Signal Processing.................................................. 2-5
Installation
3.1 Unpacking the Analyzer................................................. 3-1
3.2 Location and Mounting .................................................. 3-2
3.2.1 Control Unit Installation.......................................... 3-2
3.2.2 External Probe Installation ..................................... 3-2
3.2.3 Installing the Micro-Fuel Cell ................................. 3-2
3.3 Electrical Connections ................................................... 3-3
3.4 Gas Connections ........................................................... 3-6
3.5 Installation Checklist ...................................................... 3-6
Operation
4.1 Introduction .................................................................... 4-1
4.2 Using the Function and Data Entry Buttons ................... 4-2
4.3 Setting the Analysis Ranges.......................................... 4-2
4.3.1 HI Range ............................................................... 4-2
4.3.2 LO Range .............................................................. 4-3
4.4 Setting the Alarm Setpoints............................................ 4-3
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4.4.1 Alarm 1 .................................................................. 4-3
4.4.2 Alarm 2 .................................................................. 4-3
4.4.3 Sensor Fail Alarm .................................................. 4-4
4.5 Selecting a Fixed Range or Autoranging ....................... 4-4
4.6 Calibration ..................................................................... 4-4
Maintenance
5.1 Replacing the Fuse........................................................ 5-1
5.2 Sensor Installation or Replacement ............................... 5-2
5.2.1 When to Replace a Sensor .................................... 5-2
5.2.2 Ordering and Handling of Spare Sensors .............. 5-3
5.2.3 Removing the Micro-Fuel Cell ............................... 5-3
5.2.4 Installing a Micro-Fuel Cell .................................... 5-3
5.2.5 Cell Warranty Conditions ....................................... 5-4
Appendix
A.1 Specifications ................................................................ A-1
A.2 Spare Parts List ............................................................. A-2
A.3 Reference Drawing ........................................................ A-3
A.4 Miscellaneous................................................................ A-3
A.5 Material Safety Data Sheet ............................................ A-3
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DANGER
COMBUSTIBLE GAS USAGE WARNING
This is a general purpose instrument designed for usage in a
nonhazardous area. It is the customer's responsibility to ensure
safety especially when combustible gases are being analyzed
since the potential of gas leaks always exist.
The customer should ensure that the principles of operating of
this equipment is well understood by the user. Misuse of this
product in any manner, tampering with its components, or unau-
thorized substitution of any component may adversely affect
the safety of this instrument.
Since the use of this instrument is beyond the control of
Teledyne, no responsibility byTeledyne, its affiliates, and agents
for damage or injury from misuse or neglect of this equipment is
implied or assumed.
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Percent Oxygen Analyzer
Introduction 1
Introduction
1.1 Overview
TheTeledyneElectronicTechnologiesAnalyticalInstruments(TETAI)
Model3300PAisamicroprocessor-basedpercentoxygenanalyzerforreal-
timemeasurementofthepercentofoxygenininertgases,orinawidevarietyof
gasmixtures.Itfeaturessimpleoperation,fastresponse,andacompact,rugged
construction.TypicalapplicationsoftheModel3300PAaremonitoringnitrogen
generatorsandinertgasblanketingapplications.
1.2 Main Features of the Analyzer
Themainfeaturesoftheanalyzerinclude:
•
Highresolution,accuratereadingsofoxygencontentfrom0-1 %
through0-25 %,with0-100%rangeoptional. Large,bright,light-
emitting-diodemeterreadout.
•
•
•
Simplepushbuttoncontrols.
Nyloncellholder.
AdvancedMicro-FuelCell,forpercentanalysis,hasatwoyear
warrantyandanexpectedlifetimeof3years.
•
•
•
Unaffectedbyoxidizablegases.
Fastresponseandrecoverytime.
Microprocessorbasedelectronics:8-bitCMOSmicroprocessor
with on-board RAM and 16 KB ROM.
•
•
Twouserselectableranges(from0-1 %through0-25 %)allowbest
matchtousersprocessandequipment.
Air-calibrationrangeforconvenientspanningat20.9 %.
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1 Introduction
Model 3300PA
•
OperatorcanselectAutoranging,whichallowstheanalyzerto
automaticallyselecttheproperpresetrangefor agiven
measurement,orhecanlocktheanalyzerontoasinglerange.
•
•
•
Twoconcentrationalarmswithadjustablesetpoints.
Sensorfailurealarm.
Threeanalogoutputs:twoformeasurement(0–10V dc,and
negativeground4–20mA dc)andoneforrangeidentification
(0-10 V dc).
•
CompactandruggedControlUnitwithflush-panelcase.Designed
forindooruse.
1.3 Front Panel Description
Allcontrolsanddisplaysexceptthepowerswitchareaccessiblefromthe
frontpanel.SeeFigure1-1.Thefrontpanelhassevenpushbuttonmembrane
switches,adigitalmeter,andanalarmindicatorLEDforoperatingtheanalyzer.
ThesefeaturesaredescribedbrieflyhereandingreaterdetailinChapter4,
Operation.
Figure 1-1: Front Panel
FunctionKeys:Sevenpushbuttonmembraneswitchesareusedtoselect
thefunctionperformedbytheanalyzer:
•
Set Alarm 1
SetsAlarm1HiorLow,andtheconcentration
atwhichalarm1 activates.
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Percent Oxygen Analyzer
Introduction 1
•
•
•
•
Set Alarm 2
Sets the Alarm 2 Hi or Low, and the
concentrationtowhichalarm2activates.
Set HI Range
Set LO Range
Span
Setthehighanalysisrangefortheinstrument(up
to 0-25 %).
Setthelowanalysisrangefortheinstrument
(down to 0-1 %).
Spancalibratetheanalyzer.
DataEntryKeys:Twopushbuttonmembraneswitchesareusedto
manuallychangemeasurementparametersoftheinstrumentastheyaredisplayed
ontheLEDmeterreadout:
•
UpArrow
Incrementvaluesofparametersupwardsasthey
aredisplayedontheLEDreadout.
•
DownArrow
Incrementvaluesofparametersdownwardsas
theyaredisplayedontheLEDreadout.
DigitalLEDReadout: ThedigitaldisplayisaLEDdevicethat
produceslarge,bright,7-segmentnumbersthatarelegibleinanylighting
environment.Ithastwofunctions:
•
MeterReadout: Asthemeterreadout,itdisplaystheoxygen
concentrationcurrentlybeingmeasured.
•
MeasurementParametersReadout: Italsodisplaysuser-
definablealarmsetpoints,ranges,andspancalibrationpointwhen
theyarebeingcheckedorchanged.
1.4 Rear Panel Description
Therearpanelcontainstheelectricalinputandoutputconnectors. The
connectorsaredescribedbrieflyhereandindetailintheInstallationchapterof
thismanual.
Figure 1-2 Rear Panel
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1 Introduction
Model 3300PA
•
•
PowerConnection
100–240 V ac, at 50/60 Hz. The connector
housingincludesthefuseholderandthe
powerswitch.
FuseHolder:Replacingthefuseis
describedinChapter5,Maintenance.
I/OPowerSwitch:Turnstheinstrument
power ON (1) or OFF (0).
AnalogOutputs
0–10 V dcconcentrationoutput.
0–10 V dcrangeID(oroptionaloverrange)
output.
4–20 mA dcconcentrationoutput,negative
ground.
•
•
AlarmConnections Alarm1,Alarm2,andSensorFailureAlarm
connections.
SensorConnector
InternalSamplingSystem,Sensor
Connector.
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Percent Oxygen Analyzer
Operational Theory 2
Operational Theory
2.1 Introduction
Theanalyzeriscomposedoftwosubsystems:
1. AnalysisUnitwithMicro-FuelCellSensor
2. ControlUnitwithSignalProcessing,DisplayandControls
TheAnalysisUnitisdesignedtoacceptthesamplegasanddirectittothe
sensitivesurfaceoftheMicro-FuelCellsensor.TheMicro-FuelCellisan
electrochemicalgalvanicdevicethattranslatestheamountofoxygenpresentin
thesampleintoanelectricalcurrent.
TheControlUnitprocessesthesensoroutputandtranslatesitintoelectrical
concentration,range,andalarmoutputs,andapercentoxygenmeterreadout.It
containsamicrocontrollerthatmanagesallsignalprocessing,input/output,and
displayfunctionsfortheanalyzer.
2.2 Micro-Fuel Cell Sensor
2.2.1 Principles of Operation
TheoxygensensorusedintheModel3300PAisaMicro-FuelCell
designedandmanufacturedbyTAI.Itisasealed,disposableelectrochemical
transducer.
TheactivecomponentsoftheMicro-FuelCellareacathode,ananode,
andtheaqueousKOHelectrolyteinwhichtheyareimmersed.Thecellconverts
theenergyfromachemicalreactionintoanelectricalpotentialthatcanproducea
currentinanexternalelectricalcircuit.Itsactionissimilartothatofabattery.
Thereis,however,animportantdifferenceintheoperationofabatteryas
comparedtotheMicro-FuelCell:Inthebattery,allreactantsarestoredwithin
thecell,whereasintheMicro-FuelCell,oneofthereactants(oxygen)comes
fromoutsidethedeviceasaconstituentofthesamplegasbeinganalyzed.The
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2 Operational Theory
Model 3300PA
Micro-FuelCellisthereforeahybridbetweenabatteryandatruefuelcell.(All
ofthereactantsarestoredexternallyinatruefuelcell.)
2.2.2 Anatomy of a Micro-Fuel Cell
TheMicro-FuelCellismadeofextremelyinertplastic(whichcanbe
placedconfidentlyinpracticallyanyenvironmentorsamplestream).Itiseffec-
tivelysealed,thoughoneendispermeabletooxygeninthesamplegas.Atthe
permeableendascreenretainsadiffusionmembranethroughwhichtheoxygen
passesintothecell.Attheotherendofthecellisaconnector,andatemperature
compensationnetwork(resistorsandthermistor)onaprintedcircuitboard.
RefertoFigure2-1, BasicElementsofaMicro-FuelCell, whichillus-
tratesthefollowinginternaldescription.
Electrical Connector
C ircuit Board
w ith tem perature com pensation network.
Anode
C athode
Teflon M embrane
Screen
C lam p
Figure 2-1. Basic Elements of a Micro-Fuel Cell (not to scale)
Atthesensingendofthecellisadiffusionmembrane,whosethicknessis
veryaccuratelycontrolled.Nearthediffusionmembraneliestheoxygensensing
element—thecathode.
Theanodestructureislargerthanthecathode.Itismadeofleadandis
designedtomaximizetheamountofmetalavailableforchemicalreaction.
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Percent Oxygen Analyzer
Operational Theory 2
Thespacebetweentheactiveelementsisfilledbyastructuresaturatedwith
electrolyte.Cathodeandanodearewetbythiscommonpool.Theyeachhavea
conductorconnectingthem,throughsomeelectricalcircuitry,tooneofthe
externalcontactsintheconnectorreceptacle,whichisonthetopofthecell.
2.2.3 Electrochemical Reactions
ThesamplegasdiffusesthroughtheTeflonmembrane.Anyoxygeninthe
samplegasisreducedonthesurfaceofthecathodebythefollowingHALF
REACTION:
O2 + 2H2O + 4e– → 4OH–
(cathode)
(Fourelectronscombinewithoneoxygenmolecule—inthepresenceof
waterfromtheelectrolyte—toproducefourhydroxylions.)
Whentheoxygenisreducedatthecathode,leadissimultaneouslyoxidized
attheanodebythefollowingHALFREACTION:
2(Pb + 2OH–) → 2(Pb+2 + H2O) + 4e–
(anode)
(Twoelectronsaretransferredforeachatomofleadthatisoxidized.TWO
ANODEREACTIONSbalanceonecathodereactiontotransferfourelec-
trons.)
Theelectronsreleasedatthesurfaceoftheanodeflowtothecathode
surfacewhenanexternalelectricalpathisprovided.Thecurrentisproportional
totheamountofoxygenreachingthecathode.Itismeasuredandusedto
determinetheoxygenconcentrationinthegasmixture.
TheoverallreactionforthefuelcellistheSUMofthehalfreactionsabove,
or:
2Pb + O2 → 2PbO
(Thesereactionswillholdaslongasnogaseouscomponentscapableof
oxidizingleadarepresentinthesample. Theonlylikelycomponentsarethe
halogens—iodine,bromine,chlorineandfluorine.)
Theoutputofthefuelcellislimitedby(1)theamountofoxygeninthecell
atthetimeand(2)theamountofstoredanodematerial.
Intheabsenceofoxygen,nocurrentisgenerated.
2.2.4 The Effect of Pressure
Inordertostatetheamountofoxygenpresentinthesampleasapercent-
ageofthegasmixture,itisnecessarythatthesamplediffuseintothecellunder
constantpressure.
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2 Operational Theory
Model 3300PA
Ifthepressurechanges,theratethatoxygenreachesthecathodethrough
thediffusingmembranewillalsoincrease.Theelectrontransfer,andthereforethe
externalcurrent,willincrease,eventhoughtheproportionofoxygenhasnot
changed.
Fortunately,Dalton'sLawconfirmsthateverygasinamixturecontributes
thesamepressuretothemixturethatitwouldexertifitwerealoneinthesame
amountinthatsamevolume.Thismeansthataslongasthetotalpressureofthe
sampleremainsconstant,themixturecanchange,butthediffusionoftheoxygen
willbeaffectedonlybytheconcentrationoftheoxygen.
Forthisreason,thesamplesystemsupplyingsamplegastothecellshould
bedesignedtokeepthepressureonthediffusionmembraneconstant.
2.2.5 Calibration Characteristics
GiventhatthetotalpressureofthesamplegasatthesurfaceoftheMicro-
FuelCellinputisconstant,aconvenientcharacteristicofthecellisthatthe
currentproducedinanexternalcircuitofconstantimpedanceisdirectlypropor-
tionaltotherateatwhichoxygenmoleculesreachthecathode,andthisrateis
directlyproportionaltotheconcentrationofoxygeninthegaseousmixture.In
otherwordsithasalinearcharacteristiccurve,asshowninFigure2-2.Measur-
ingcircuitsdonothavetocompensatefornonlinearities.
Figure 2-2. Characteristic Input/Output Curve for a Micro-Fuel Cell
Inaddition,sincethereiszerooutputintheabsenceoxygen,thecharacter-
isticcurvehasanabsolutezero.Thecellitselfdoesnotneedtobezeroed.
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Percent Oxygen Analyzer
Operational Theory 2
2.3 Electronics
2.3.1 General
ThesignalprocessingusesanIntel microcontrollerwithon-boardRAM
andROMtocontrolallsignalprocessing,input/output,anddisplayfunctionsfor
theanalyzer.Systempowerissuppliedfromauniversalpowersupplymodule
designedtobecompatiblewithmostinternationalpowersources.
ThepowersupplycircuitryisonthePowerSupplyPCB,whichismounted
vertically,justbehindtherearpaneloftheControlUnit.
Thesignalprocessingelectronicsincludingthesensoramplifier,
microcontroller,analogtodigital,anddigitaltoanalogconvertersarelocatedon
theMainPCB,whichismountedvertically,justbehindthefrontpanelofthe
ControlUnit.
2.3.2 Signal Processing
Figure2-3isablockdiagramofthesignalprocessingelectronicsdescribed
below.
Millivolt
Potput
TEMPERATU RE
SENSO R
AMPLIFIER
CO MPENSATION
NETW ORK ON
SENSO R PCB
MFC
E–I CON V
4–20 mA dc
A D C
Microamp
Output
Concentration
0–10 V dc
RAN GE ID
I-22 Sensor
D A C
MICRO -
CO NTRO L-
LER
KEYBO ARD
DISPLAY
RELAYS
RELAYS
ALAR MS
ALAR MS
Figure 2-3: Block Diagram of the Signal Processing Electronics
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2 Operational Theory
Model 3300PA
Inthepresenceofoxygenthecellgeneratesacurrent.Thiscurrentflows
throughaninternalthermistorcompensationnetwork.
Theoutputofthesensorisconvertedtovoltageinthemillivoltrange. This
outputisfedtoavoltageamplifier. Theinternalthermistornetworkprovides
temperaturecompensationofthesensoroutput. Theresistanceofthenetwork
changeswithtemperature,compensatingforthechangesofthemicrofuelcell
outputtotemperature.
Theoutputfromthesensoramplifierissenttoananalogtodigitalconverter
(ADC),andtheresultingdigitalconcentrationsignalissenttothe
microcontroller.
Thedigitalconcentrationsignalalongwithinputfromthefrontpanelbuttons
(KEYBOARD)isprocessedbythemicrocontroller,andappropriateoutput
signalsaredirectedtothedisplayandalarmrelays. Thesamedigitalinformation
isalsosenttoa12-bitdigitaltoanalogconverter(DAC)thatproducesthe0-10
V dcanalogconcentrationsignalandthe0-10V dcanalograngeIDoutput.A
currenttovoltageconverter(E–ICONV)producesthe4-20mA dcanalog
concentrationsignal.
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Percent Oxygen Analyzer
Installation 3
Installation
Installationoftheanalyzerincludes:
1. Unpacking the system.
Overvoltage
Category II
2. Mounting the Control Unit to a 19" Rack.
3. InstallingtheMicro-FuelCell.
4. Makingtheelectricalconnections.
5. Making the gas connections.
6. Testingtheinstallation.
CAUTIONS:
Read this chapter in its entirety before installing the units.
For indoor use only.
The Sample must be free of entrained solids or water. How-
ever, a high humidity sample is ideal, since it will prevent
water loss from the cell electrolyte.
The Micro-Fuel Cell sensor electrolyte is caustic. Do not
attempt to open it. Leaking or exhausted cells should be
disposed of in accordance with local regulations. Refer to the
Material Safety Data Sheet in the Appendix.
Any damage or scarring of the delicate permeable membrane
on the sensing end of the cell will require cell replacement.
Prevent contact with membrane by any solid object.
3.1 Unpacking the Analyzer
As soon as you receive the instrument, carefully unpack and inspect
Control Unit, and any included accessories for damage. Immediately report
any damage to the shipping agent. The analyzer is shipped with all the
materials you need to install and prepare the system for operation.
CAUTION: Do not disturb the integrity of the cell package until the cell is to
actually be used. If the cell package is punctured and air is
permitted to enter, cell-life will be compromised.
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3 Installation
Model 3300PA
3.2 Location and Mounting
3.2.1 Control Unit Installation
The 3300PA Control Unit is designed to be rack mounted in a general
purpose, indoor area, away from moisture and the elements. The unit should
be installed at viewing level in a sheltered area.
Refer to the Outline diagram D-69220 for the physical dimensions of
theanalyzer.
3.2.2 Installing the Micro-Fuel Cell
A Micro-Fuel Cell is included as a separate item. It must be installed
prior to instrument use.
Also, once it is expended, or if the instrument has been idle for a
lengthy period, the Micro-Fuel Cell will need to be replaced.
To install or replace the Micro-Fuel Cell, follow the procedures in
Chapter 5, Maintenance.
3.3 Electrical Connections
Figure 3-1 shows the Model 3300PB rear panel. For detailed pinouts,
see the wiring/interconnection drawings in the Drawings section at the rear
of this manual.
Figure 3-1 Electrical Connectors for AC Control Unit
3-2
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Percent Oxygen Analyzer
Installation 3
Primary Input Power: The power cord receptacle, fuse block and
Power switch are located in the same assembly. A 6-foot, standard AC
power cord is supplied with the Control Unit. Insert the female plug end of
the power cord into the power cord receptacle.
The universal power supply allows direct connection to any 100-240
VAC, 50/60Hz power source. The fuse block, to the right of the power cord
receptacle, accepts two 3AG, 0.5 A, time-lag (T) fuse. (See Fuse Replace-
ment in chapter 5, Maintenance.)
The Power switch is located on the right-hand end of the power source
inputreceptacleassembly.
Analog Outputs: There are three DC output signal connectors with
screw terminals on the panel. There are two wires per output with the polar-
ity noted. See Figure 3-3. The outputs are:
0–10 V % Range:
Voltage rises with increasing oxygen concentration,
from 0 V at 0 percent oxygen to 10 V at full scale
percent oxygen. (Full scale = 100% of programmed
range.)
0–10 V Range ID:
03.33 V = Low Range, 06.66 V = High Range,
10 V = Air Cal Range.
4–20 mA % Range: Current increases with increasing oxygen concentra-
tion, from 4 mA at 0 percent oxygen to 20 mA at full
scale percent oxygen. (Full scale = 100% of pro-
grammedrange.)
Alarm Relays: The three alarm-circuit connectors are screw terminals
for making connections to internal alarm relay contacts. There is one set of
contacts for each type of alarm. Contacts are Form C, with normally open
and normally closed contact connections capable of switching up to 0.5
ampere at 125 VAC into a resistive load (2A for 30 VDC).
The alarm relay circuits are designed for failsafe operation, meaning the
relays are energized during normal operation. If power fails the relays de-
energize(alarmsactivated).
The contact connections are indicated diagrammatically on the rear
panel as Normally Closed, Common, and Normally Open. Figure 3-2
explains how these act in failsafe operation.
Alarm 1 and Alarm 2 can both be configured as either HI or LO. A HI
alarm will activate when concentration is above threshold, while a LO alarm
will activate when concentration is below threshold.
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3 Installation
Model 3300PA
Figure 3-2: Contact ID for FAILSAFE Relay Operation
The specific descriptions for each type of alarm are as follows:
Alarm #1
Programmable as high or low alarm. Can be set any-
where between 0 and 25 %.
Alarm #2
Programmable as high or low alarm. Can be set any-
where from 0 to 25 %.
Sensor Fail
CAUTION:
Actuates when the output of the Micro-Fuel Cell sensor
falls below the acceptable level (0.05% O2).
There could be hazardous voltage at the alarms termi-
nals, even when power is removed from the instrument.
Internal Sensor Wiring: The receptacle for the analysis unit cable is
located in the lower left-hand corner of the rear panel. The 6-pin polarized
connector is keyed to fit only one way into the receptacle. Do not force it in.
The other end of the cable have two terminal connectors. This should be
connected to the header on the top of the sensor.
3.4 Gas Connections
The standard Model 3300PA has two inlets and one outlet fixture only.
Calibration gasses can be connected into the "Span" inlet. The two inlets and
one outlet are 1/8 inch brass fittings.
A selector valve is provided to feed the analysis unit with either sample
or gas.
A flowmeter and a flow controller valve are part of the system and will
assist in setting the flow of the gas.
Sample flow should be adjusted to 2 SCFH. The sample vent connec-
tion should not restrict the sample flow. The sensor is designed to operate at
3-4
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Percent Oxygen Analyzer
Installation 3
atmospheric pressure. Restricting the sample vent line will result in pressur-
izing the sensor and altering the O2 reading.
The pressure required will depend on the sampling system. When
venting into a constant pressure, such as the atmosphere, controlling input
pressure is simple. If you are venting into a system of varying pressure, then
some form of pressure regulation is required.
Figure 3-3: Piping Diagram
(standard piping diagram for positive pressure service)
3.4.1 Vacuum Service Option
For vacuum service plumbing reference figure 3-4. The vacuum
service option is recommended for applications in which the sample source is
not pressurized. The customer must supply a pump and bypass system to
complete the sample system. The sample inlet and outlet pressure must be
maintained at a constant pressure for proper performance. If the sample inlet
or vent pressure will not be held constant during the process, a pressure
regulator must be used to regulate the pressure across the cell.
Adjust the flow rate on a vacuum service system as follows:
Select Sample with the three-way control valve and open the flow
control valve on the analyzer to full flow (located on the analyzer flow
meter). Open the pump bypass valve, and turn on the pump. Readjust the
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3 Installation
Model 3300PA
pump by-pass valve to limit the maximum flow rate to full scale on the
flowmeter with the flowmeter valve fully open. Adjust the analyzer flow
control valve (flowmeter valve) to a flow-rate of approximately 2 SCFH).
Select Span and verify that the span and Sample gas are at different pres-
sures. The calibration accuracy will be adversely affected if the Span and
Sample gases are at differing pressures.
If the span gas is provided from pressurized source, a control valve
must be added between the analyzer and the span gas source. This valve is
used to adjust the span flow rate to match the sample flow rate. Do not
adjust the span flow rate with the flow control valve located on the analyzer
for units with vacuum service options.
Custom e r Supplie d Pa rts
Figure 3-3: Piping Diagram for Vacuum Service Option
3.5 Installation Checklist
Before connecting the instrument to the power source and turning it on,
make sure you have:
•
•
•
•
Correctly installed the Sample and Exhaust gas lines
Opened the isolation valves
Checked for leaks
Set the sample pressure to 5–10 psig, nominal (for non-vacuum
serviceunits)
•
Set the flow
Once the above checks have been made, you can connect to the power
source. The instrument is now ready for operation.
3-6
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Percent Oxygen Analyzer
Operation 4
Operation
4.1 Introduction
Once the analyzer has been mounted, the gas lines connected and the
electrical connections made, the Analyzer can be configured for your appli-
cation. This involves setting the system parameters:
•
•
•
Defining the user selectable analysis ranges.
Settingalarmsetpoints.
Calibratingtheinstrument.
All of these functions are performed via the front panel controls, shown
in Figure 4-1.
Analyzing for the percent oxygen level in the gas passing through the
cell block is the default mode of operation. As long as no front panel buttons
are being pressed the Analyzer is analyzing.
Figure 4-1: Front Panel Controls and Indicators
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4 Operation
Model 3300PA
4.2 Using the Function and Data Entry
Buttons
When no buttons on the Analyzer are being pressed, the instrument is in
the Analyze mode. It is monitoring the percent of oxygen in the sample gas
that is flowing through the Remote Probe.
When one of the Function Buttons is being pressed, the Analyzer is in
the Setup mode or the Calibration mode.
The 4 Setup function buttons on the analyzer are:
•
•
•
•
SET ALARM 1
SET ALARM 2
SET HI RANGE
SET LO RANGE
The Calibration mode button is:
SPAN
•
The Data Entry buttons (∆ and ∇) increment the values displayed on
the PERCENT OXYGEN meter while one of the Function buttons is being
held down.
•
•
∆: Incrementsthedisplayedvalueupwards.
∇: Incrementsthedisplayedvaluedownwards.
Any of the functions can be selected at any time by holding down the
appropriatebutton.
Each function will be described in the following sections. Although the
operator can use any function at any time, the order chosen in this manual is
appropriate for an initial setup.
4.3 Setting the Analysis Ranges
The two user definable analysis ranges are both capable of being
adjusted for from 0-1% to 0-25% oxygen concentration. Whatever values are
selected, the analyzer automatically switches from the LO range to the HI
range when the oxygen concentration reaches 100% of the LO range
fullscale value, and it switches back to the LO range when the oxygen
concentration reaches 85% of the LO range fullscale value
Note: The HI Range setpoint MUST be set at a higher concentration percent-
age than the LO Range setpoint.
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Percent Oxygen Analyzer
Operation 4
4.3.1 HI Range
Setting the HI Range fullscale value defines the LEAST sensitive
analysis range to be used. To set the HI Range:
1. Press the SET HI RANGE Function button once.
2. Immediately (within 5 seconds) press either the ∆ or ∇ button to
raise or lower the displayed value, as required, until the display
readsthedesiredfullscalepercentconcentration.
4.3.2 LO Range
Setting the LO Range fullscale value defines the MOST sensitive range
to be used. To set the LO Range:
1. Press the SET LO RANGE Function button once.
2. Immediately (within 5 seconds) press either the ∆ or ∇ button to
raise or lower the displayed value, as required, until the display
readsthedesiredfullscalepercentconcentration.
4.4 Setting the Alarm Setpoints
The alarm setpoints can be adjusted over the full range of the analyzer
(0-25% oxygen content). They are set as a percent of oxygen content, so that
an alarm set to indicate 9.6 on the display will activate at 9.6% O2 on any O2
range.
4.4.1 Set Alarm 1
Alarm 1 can be set either as a high or low alarm. To configure this
alarm to your preferences:
1. Press the SET ALARM 1 function button once.
2. The display will flash either HI or LO depending on what the
alarm was configured in the last time. If the alarm configuration
must be changed, use the Up or Down keys to toggle the alarm
from HI to LO or viceversa (if within 5 seconds no key is
pressed, the instrument will return to the sample mode and
displayoxygenconcentration).
3. To change the setting at which the alarm will be actuated, press
the SET ALARM 1 function button once more. The alarm
setpoint will flash on the LED display. Press either the Up or
Down keys to raise or lower the displayed value, as required,
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4 Operation
Model 3300PA
until the display reads the desired percent concentration. (if
within 5 seconds no key is pressed, the instrument will return to
the sample mode and display oxygen concentration).
After setting the value wait for the unit to time out of this mode (ap-
proximately 5 seconds) and return to displaying oxygen concentration.
4.4.2 Set Alarm 2
Alarm 2 can be set either as a high or low alarm. To configure this
alarm to your preferences:
1. Press the SET ALARM 2 function button once.
2. The display will flash either HI or LO depending on what the
alarm was configured in the last time. If the alarm configuration
must be changed, use the Up or Down keys to toggle the alarm
from HI to LO or viceversa (if within 5 seconds no key is
pressed, the instrument will return to the sample mode and
displayoxygenconcentration).
3. To change the setting at which the alarm will be actuated, press
the SET ALARM 2 function button once more. The alarm
setpoint will flash on the LED display. Press either the Up or
Down keys to raise or lower the displayed value, as required,
until the display reads the desired percent concentration. (if
within 5 seconds no key is pressed, the instrument will return to
the sample mode and display oxygen concentration)
After setting the value wait for the unit to time out of this mode (ap-
proximately 5 seconds) and return to displaying oxygen concentration.
4.4.3 Sensor Fail Alarm
The SENSOR FAIL alarm is factory set to a reading less than 0.05%
O2. Should this alarm trigger the ALARM Indicator below the SET Func-
tion buttons will blink, and the alarm relay contact dedicated to this function
will change state.
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Percent Oxygen Analyzer
Operation 4
4.5 Selecting a Fixed Range or Autoranging
The Model 3300PA can operate in fixed high, fixed low, or
autoranging mode. To change modes:
1. Press and then release the SET HI RANGE and the SET LO
RANGE buttons simultaneously.
2. Immediately (within 5 seconds) press either the ∆ or ∇ button
until Auto, Lo, or Hi displays on the LCD, as desired.
After about three seconds, the analyzer resumes monitoring in the
selected range mode.
4.6 Calibration
Preliminary—If not already done: Power up the Analyzer and
allow the LED reading to stabilize. Set the Alarm setpoints and
the fullscale ranges to the desired values.
3300PA SpanProcedure:
1. Press the SPAN button once.
Note: The numeric LED starts flashing and will continue to flash for five
minutes before timing-out. During this five minutes interval, the LED
will continue to track gas through the analyzer.
2. Flow span gas of a known oxygen concentration into the
analyzer. The analyzer will begin to track the span gas.
Note: The alarms will not change state during span calibration.
3. When the meter stabilizes, use the UP/DOWN arrows to adjust
the analyzer span value to the exact percent O2 concentration in
the span gas.
Note: When an arrow button is first pressed, the LED begins flashing
slightly more rapidly and no longer tracks the span gas. Instead, it
respondstotheUP/DOWNkeystrokes.
Note: While the LED is flashing slightly more rapidly, the SPAN routine will
time-out in five seconds (instead of five minutes), if no further key-
strokesareentered.
4. When the span value is set to the known concentration of O2 in
the span gas, stop pressing the keys and wait for five seconds.
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4 Operation
Model 3300PA
Note: When you stop pressing the UP/DOWN keys, the rapid flashing will
cease and the new span value will be acquired by the analyzer after
fiveseconds.
The alarms will only be nonresponsive for 60 seconds. This time-
frame allows you to reintroduce sample gas into the analyzer.
5. Immediately flow sample into the analyzer.
Supplementary Information
If, during the Span Procedure, you pressed the SPAN button by mis-
take, you must wait five minutes for the analyzer to resume analisis or you
can press the UP button and then the DOWN button. (Pressing the UP and
DOWN buttons causes the analyzer to time-out in five seconds instead of
fiveminutes).
If during the span procedure, you press the RANGE or ALARM
buttons:
- either the range or alarm routine will be activated.
- any changes to span will be rejected.
- the 60 second alarm delay will not occur, i.e., the alarms will be
responsive immediately.
CAUTION: TET/AI considers the action of pressing the ALARM or
RANGE buttons to be at your (the user’s) discretion and
NOT under guarantee of alarm protection.
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Percent Oxygen Analyzer
Maintenance 5
Maintenance
Asidefromnormalcleaningandcheckingforleaksatthegasconnections,
theModel3300PAshouldnotrequireanymaintenancebeyondreplacementof
expendedMicro-FuelCells,andperhapsablownfuse.Routinemaintenance
includesoccasionalrecalibration,asdescribedinchapter4,Operation.
Overvoltage
Category II
5.1 Replacing the Fuse
Remove Power to Unit before replacing the fuse.
Whenafuseblows,checkfirsttodeterminethecause,thenreplacethe
fuseusingthefollowingprocedure:
1. DisconnecttheACpowerandplacethepowerswitchlocatedon
therearpanelintheOposition.Removethepowercordfromthe
receptacle.
2. Thefusereceptacleislocatedinthepowercordreceptacle
assemblyintheupperleft-handcorneroftherearpanel.SeeFigure
5-1.
Fuse
Figure 5-1: AC Fuse Replacement
3. Insertasmallflat-bladescrewdriverintotheslotinthereceptacle
wallnearestthefuseandgentlypryopenthefusereceptacle.The
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5 Maintenance
Model 3300PA
fuseholderwillslideout.Therearetwofusesinuseandarevisiblein
theclip.
4. Removethebadfuseandreplaceitwitha5x20mm0.5 A,
250 VAC, IEC time lag (T) fuse (P /N F1128).
5. Replacethefuseholderintoitsreceptacle,pushinginfirmlyuntilit
clicks.
5.2 Sensor Installation or Replacement
5.2.1 When to Replace a Sensor
TheMicro-FuelCelltypicallyprovidealmostconstantoutputthroughtheir
usefullife,andthenfalloffsharplytowardszeroattheend.Youwillfindthat
verylittleadjustmentwillberequiredtokeeptheanalyzercalibratedproperly
duringthedurationofagivencell’susefullife.
Ifthesamplebeinganalyzedhasalowoxygenconcentration,cellfailure
willprobablybeindicatedbytheinabilitytoproperlycalibratetheanalyzer.If
largeadjustmentsarerequiredtocalibratetheinstrument,orcalibrationcannot
beachievedwithintherangeofthe∆∇buttons,thecellmayneedreplacing.
ReadthesectionCellWarrantyConditions,below,beforereplacingthecell.
Inaddition,ifthefrontpanelPercentOxygenMeterdisplays“00.0”when
theunitispluggedin,andthepowerswitchisintheONposition,thesensor
needs to be replaced.
IMPORTANT: After replacing the Micro-Fuel Cell, the analyzer must be
recalibrated. See Calibration in chapter 4.
5.2.2 Ordering and Handling of Spare Sensors
Tohaveareplacementcellavailablewhenitisneeded,TBE/AIrecom-
mendsthatonesparecellbepurchasedshortlyaftertheinstrumentisplacedin
service,andeachtimethecellisreplaced.
CAUTION: Do not stockpile cells. The warranty period starts on the day of
shipment. For best results, order a new spare cell when the
current spare is installed.
Thesparecellshouldbecarefullystoredinanareathatisnotsubjectto
largevariationsinambienttemperature(75° Fnominal),andinsuchawayasto
eliminatethepossibilityofincurringdamage.
CAUTION: Do not disturb the integrity of the cell package until the cell is to
actually be used. If the cell package is punctured and air is permit-
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Percent Oxygen Analyzer
Maintenance 5
ted to enter, cell-life will be compromised.
WARNING: The sensor used in the Model 3300PA uses electrolytes
which contain substances that are extremely harmful if
touched, swallowed, or inhaled. Avoid contact with ANY
fluid or powder in or around the unit. What may appear to be
plain water could contain one of these toxic substances. In
case of eye contact, immediately flush eyes with water for
at least 15 minutes. Call physician. (See Appendix, Material
Safety Data Sheet—MSDS).
5.2.3 Removing the Micro-Fuel Cell
ToremoveaspentordamagedMicro-FuelCell:
1. DisconnectthePowerSourcefromtheUnit.
2. OpenSensorHousingdooronthefrontpanel.
3. Unplugtheconnectorfromthespentcell.
4. Removethespentcellbyunscrewingit,counterclockwise,fromthe
cellblock.
5. Disposeofthecellinasafemanner,andinaccordancewithlocal
laws.
5.2.4 Installing a Micro-Fuel Cell
ToinstallanewMicro-FuelCell:
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Model 3300PA
CAUTION: Do not scratch, puncture, or damage the sensing membrane of the
Micro-Fuel Cell sensor. Damage to the membrane will require
replacementofthesensor.
1. DisconnectthePowerSourcefromtheUnit.
2. RemovethenewMicro-FuelCellfromitsprotectivebag,being
carefulnottolosetheO-ringatthebaseofthethreadedportionof
thecell.
3. OpenSensorHousingdooronthefrontpanel.
4. Replacethecellonthecellholderbyscrewingitclockwiseintothe
cellblockuntilitisheldfirmlyinthesocket.
5. Insertthecellblockelectricalconnectorplugintothesocketinthe
sensor.
5.2.5 Cell Warranty Conditions
TheClassI-22 Micro-FuelcellisusedintheModel3300PA.Thiscellis
alonglifecellandiswarrantedfor2years(underspecifiedoperatingcondi-
tions—seeAppendix)fromthedateofshipment.NoteanyAddendaattachedto
thefrontofthismanualforspecialinformationapplyingtoyourinstrument.
Withregardtosparecells,warrantyperiodbeginsonthedateofshipment.
Thecustomershouldstockonlyonesparecellperinstrumentatatime.Donot
attempttostockpilesparecells.
Ifacellwasworkingsatisfactorily,butceasestofunctionbeforethe
warrantyperiodexpires,thecustomerwillreceivecredittowardthepurchaseof
anewcell.
Ifyouhaveawarrantyclaim,youmustreturnthecellinquestiontothe
factoryforevaluation.Ifitisdeterminedthatfailureisduetofaultyworkmanship
ormaterial,thecellwillbereplacedatnocosttothecustomer.
NOTE: Evidence of damage due to tampering or mishandling will render the
cell warranty null and void.
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Percent Oxygen Analyzer
Appendix
Appendix
A.1 Specifications
Ranges:
0-3 %and0-10 %oxygen(Standard
Ranges),and0-25 %(nominal)Calibration
Range.Userselectable%Rangescanbeset
between1%and25 %oxygen(optional
100%range).
SignalOutput:
Voltage: 0–10 V dc,negativeground
Current: 4-20mA,negativeground
Range ID: 0-10 V dc.
Display:
Lightemittingdiodedisplay.
Alarms:
Twocustomerselectablehighorlowfully
adjustablealarms. Onecellfailurealarm.
Alarmrelaysform"C"contacts,drycontacts
rated at 2A for 30VDC, 0.5A for 115VAC.
SystemOperatingTemp:
0-50 °C
Accuracy:
±2%offullscaleatconstanttemperature
±5%offullscalethroughoperatingtemp.
rangeoncetemp.equilibriumisreached.(At
3 %andhigheruserdefinedranges.)
Response Time:
90% in less than 8 seconds at 25 °C.
SystemPowerRequirements: AC (100-240 VAC, 50/60Hz), 10W.
SystemEnclosure:
Rackmountwithhandles. Dimensions
(Approx.) 19 W x 5 H x 5 D.
SensorType:
MicroFuelCellClassI-22.
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Appendix
Model 3300PA
A.2 Spare Parts List
QTY. P/N
DESCRIPTION
1
1
1
1
2
1
C-65220E
PC Board, Main
PC Board, Main for 0-100% range.
PC Board, Power Supply, AC Version
Micro-FuelCell, I-22
Fuse (AC), ½A, 250 VAC, IEC Type T
Flowmeter 0.3-3.0 SCFH
C-65220F
C-64586C
C-44611-I-22
F-1128
F-274
IMPORTANT: Orders for replacement parts should include the part number
and the model and serial number of the system for which the
partsareintended.
Send orders to:
TELEDYNE ELECTRONIC TECHNOLOGIES
Analytical Instruments
16830 Chestnut Street
City of Industry, CA 91749-1580
Telephone: (626) 934-1500
TWX: (910) 584-1887 TDYANYL COID
Fax: (626) 961-2538
or your local representative.
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Percent Oxygen Analyzer
Appendix
A.3 Reference Drawing
D-69127 FinalAssembly(andinterconnectiondiagram)
D-69220 OutlineDiagram
A.4 Miscellaneous
The symbol: ~ is used on the rear panel of the model 3300PA to signify
voltsalternatingcurrent(V ac).
NOTE: The MSDS on this material is available upon request
through the Teledyne Environmental, Health and
Safety Coordinator. Contact at (626) 934-1592
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Appendix
Model 3300PA
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