Teledyne 9060Z Oxygen Equipment User Manual

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Model9060ZManual

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25

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high impedance alarm, ‘Probe 1 (2) High Impedance’, is not active. The actual impedance can be

displayedonthelowerline.Itshouldbelessthan9KΩat720°C(1320°F).

Onceithasbeenestablishedthattheimpedanceisnormal,theoffsetmaybesetusingthemillivolt

valuemarkedontheoxygenprobe.Seechapter6.3.1,ProbeOffset.Theprobeoffsetcanbetestedon

site.Asmallflowofairmustbeadmittedtoboththe‘REF’and‘CAL’portswhentestingtheprobe

offset.Iftheprobeisintheprocess,theairmustfullypurgetheprobesensorwithoutinterfer

ence

fromtheprocessgassample.TeledyneAnalyticalInstrumentsprobescaneasilyachievethiswithor

withoutaprobefilterandagasflowofonly1to5SLPM(2to10SCFH)fora9060Hprobeandupto

20SLPM(40SCFH)foranunheatedprobe.Whenastableoxygenre

adinghasbeenachieved,readthe

‘ProbeEMF’.Enterthisvalueintotheset‐upmenu#1fortheprobe1(set‐up#2forthesecondprobe

ifitisinstalled).

4.17FILTERPURGING

Purgingprobefiltersiscontrolledfromthe‘GAS/PURGE’buttonson thetransmitterwhenin‘RUN’

mode. If ‘Automatic’ has been selected in either ‘Sol. 1 Auto/Man’ or ‘Sol. 2 Auto/Man’ in

Commissioning Menus 21 or 30, pressing the GAS/PURGE button will start the automatic cycle.

Pressing the button again will cancel the auto purge cycle. If ‘Automatic’ was not enabled, the

solenoidwillonlystayopenforaslongasthebuttonispressed.Graduallyadjustthepurgeairsupply

regulator, increasing the pressure until sufficient flow is obtained to clear the filter. This is best

checkedwith a dirty filterafter a period of operation, by withdrawing the probe from service and

watching any build up onthe filter being blown off at the set pressure. Normally 30 kPa(5 psi) is

adequatebuttheairpressuremaybesetashighas100kPa(15psi).

4.18CALIBRATIONGASCHECK

Iftheinstallationhasafilterpurgefacility,setthisupfirst.Refertothepreviousparagraph.Pressthe

‘GAS/PURGE1or‘GAS/PURGE2’buttonwhilein‘SETUP’modetoobtainareasonableflowthrough

thecalibrationcheckgasflowmeter.Ifairisbeingusedasacalibrationcheckgas,usetheairfromthe

regulatorforfilterpurge.Then,whensettingupagasforcalibrationchecking,setthepressurefrom

thecalibrationgascylindersothatitisthesameasthepressuresetontheairregulator.Thenthe

settingontherotameter/flowregulatorwillbethesameasthatfortheairflow.Theflowrequiredis

1to5SLPM(2to10SCFH)fora9060Hprobeandupto20SL

PM(40SCFH)foranunheatedprobe.

Airisnotthebestgasforcalibrationcheckingonazirconiasensor.Theoutputofazirconiasensor

withaironbothsidesofthesensoriszeromillivolts.Itisbettertochooseagasvaluewhichprovides

areasonableoutputfromthesensorandwhichisneartotheprocessoxygenlevel.Acylinderwith2%

oxygen in nitrogen is a commonly used calibration gas. The maximum pressure on the calibration

checkgascylinderregulatorsis100kPa(15psi).

Note:If‘Dualprobe’wasselectedincommissioningmenu4,‘CalGas2’mustbeconnectedtoprobe2.

4.19DUSTINTHEFLUEGAS



Forheatedprobesthepreferredmethodofmountingfordust‐ladenapplicationsisfacingvertically

For unheated probes with no filter, entrained solids or dust in the flue gas does not present a

problemunlessthedust,whensettled,isnotporous.Allowthedustintheprocesstobuildupon

theprobe.Itwillformaporouslayerslowingtheresponsetime.Toavoidmechanicalabrasionof

theelectrodematerialininstallationswithunheatedoxygenprobes,pack‘SAFFIL’orequivalent

aluminabasedceramicfiberinthesensingholestoprotecttheelectrode.Donotusesilicabased

ceramicfiberssuchas‘KAOWOOL’,whichcanattacktheelectrodeathightemperatures.Oncethe

dusthasbuiltu

theres

onsetimeofthe

robewill beslower.

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Teledyne 9060Z Oxygen Equipment User Manual