MSA ULTIMA X5000 User Manual

5.2 CalibrationFrequency
Thefrequencyofcalibrationgastestingdependsontheoperatingtime,chemicalexposure,andtypeofsensor.Especially
innewinstallationsorapplications,itisrecommendedthatthefirstsensorsbecalibratedmoreoftentoestablishthesensor
performanceinthisparticularenvironment.
Forthis,youtypicallyrecordthe"asfound"and"asleft"gasvaluesandtrackthepercentadjustmentovertime.Then,
graduallyextendcalibrationintervalsuntilthepercentadjustmentisgreaterthantheexpectedaccuracyofthesensor.
5.3 CalibrationFrequencyforXCelSensorswithTruCal(H
2
S&COonly)
WARNING!
CertainconditionsmaypreventtheperformanceofDiffusionSupervisionand/orTruCaltesting.Ifsuchaconditionpersists
for90days,theXCellsensorwithTruCalwillrecommendacalibrationwhichiscommunicatedthroughthetransmitter
displayandLEDs.WhenCalibrationAlertisenabled,themilliampsignaloutputwillalsobedriventocalibrationalertoutput.
Performacalibrationwhenthedevicerecommendsit.
Failuretofollowthiswarningcanresultinseriouspersonalinjuryordeath.
5.3.1 CalibrationFrequencyforXCellSensorswithTruCalandDiffusionSupervision(H
2
S&COonly)
SensorswithTruCaltechnologywilladjustsensitivitywithoutanymanualinterventionorcalibration,unlesscalledforbythe
sensor.IftheadjustedsensitivityfromTruCaldeviatestoofarfromthelastgascalibrationsensitivity,thesensorwill
recommendor,inextremecases,requireacalibration.Whenacalibrationisrecommended,thetransmitterLEDstatus
indicatorsslowlypulsegreen.UserscanalsoenableaCalibrationAlertfunctionthatwillsendamilli-ampsignalonthe
analogoutputtothecontrolroomwhenacalibrationisrecommended.Whenacalibrationisrequired,thestatusLEDswill
flashyellowandthetransmitterwillgointoaCalibrationRequiredFault.WithDiffusionSupervisionenabled,thesensors
alsoactivelymonitorthesensorinletforobstructionsandinitiatesafaultifthegasdiffusionpathbecomesobstructed.
WithDiffusionSupervisionandCalibrationAlertenabled,thetimebetweenscheduledcalibrationscanbe
extendedto24months.
Ifcalibrationand/orDiffusionSupervisionaredisabled,followthecalibrationfrequencyrecommendationssetforthin5.3.2
CalibrationFrequencyforXCellSensorswithTruCalwithoutDiffusionSupervision(H2S&COonly).
5.3.2 CalibrationFrequencyforXCellSensorswithTruCalwithoutDiffusionSupervision(H
2
S&COonly)
SensorswithTruCaltechnologywilladjustsensitivitywithoutanymanualinterventionorcalibration,unlesscalledforbythe
sensor.IftheadjustedsensitivityfromTruCaldeviatestoofarfromthelastgascalibrationsensitivity,thesensorwill
recommendor,inextremecases,requireacalibration.Whenacalibrationisrecommended,thetransmitterLEDstatus
indicatorsslowlypulsegreen.UserscanalsoenableaCalibrationAlertfunctionthatwillsendamilli-ampsignalonthe
analogoutputtothecontrolroomwhenacalibrationisrecommended.Whenacalibrationisrequired,thestatusLEDswill
flashyellowandthetransmitterwillgointoaCalibrationRequiredFault.WithoutDiffusionSupervision,regularcalibrationof
thesensormuststillbeconductedtoconfirmthesensorinletisnotobstructed.
ActualTruCalsensorperformancewilldependontheapplication,backgroundgasexposure,andenvironment.Tovalidate
XCellsensorswithTruCal,itisrecommendedthatusersfollowtheirregularcalibrationcycleandrecordthe“asfound”and
“asleft”values,trackingthepercentadjustmentovertime.Onceabaselineisestablished,thecalibrationintervalscanbe
extendeduntilthepercentadjustmentisgreaterthantheexpectedaccuracyofthesensor.
5.4 CalibrationTypes:Zerovs.Span
TheULTIMAX5000hastwotypesofcalibration:ZeroandSpancalibration.
US Ultima X5000 Gas Monitor 63
5 Calibration

MSA ULTIMA X5000 Specifications

General

Ingress Protection	IP66/67
Sensors	Electrochemical, infrared
Communication	HART, Modbus
Target Gases	Combustible gases, toxic gases, oxygen
Approvals	ATEX, IECEx, UL, CSA, SIL 2