Honeywell XNX Technical Manual

XNX Universal Transmitter
Introduction
6
• WhenthetransmitterisequippedwiththeoptionalRemoteMountKit,
theremotesensormustbesecurelymountedinafixedposition.The
RemoteSensorkitisnotintendedtobeusedasahand-heldsensor.
• Enclosuresofremotelymountedsensorscontainaluminum.Becareful
toavoidignitionhazardsduetoimpactorfrictionwheninstalledin
Zone1locations.
• Installthejunctionboxaccordingtolocalcodesandmanufacturer’s
requirements.
• Theenclosuresofremotelymounted705HTsensorscontain
aluminum.Becarefultoavoidignitionhazardsduetoimpactorfriction
wheninstalledinZone1locations.
• PoweroffthetransmitterbeforechangingS3orS4.Bothswitches
mustbesetineitherSourceorSinkpriortoapplyingpower.
• Minimumandmaximumcontrolleralarmlevelsshouldnotbeset
atlessthan10%orgreaterthan90%ofthefullscalerangeofthe
sensor.Limitsare60%LELor0.6mg/m
3
foragencyperformance
certification.
• Whenconfiguringorcommunicatingwiththetransmitterusingthe
frontpaneldisplays,resumemonitoringbyexitingallmenusand
returningtotheGeneralStatusmenumanually.Notimeoutsare
invoked.
• WhenselectinganewtargetgasforunitswithaSearchpointOptima
Plus,thesensormustberecalibrated.
• XNXUniversalTransmitterscarryingUL/CSA/FMapprovalsthatare
configuredfordevicesmeasuring%LELwillnotallowadjustmentsto
thefullscalevalue.Therangeisfixedat100%.
• Thereisapotentiallossofsensitivityduringexposuretohigh
concentrationsofH2S.Undertheseconditions,setthecontrolunitto
latchatoverrange.Instandaloneconfiguration,setalarmstolatching.
Whenresettingtheoverrangeoralarm,verifycorrectoperationofthe
transmitter.
• Keepthepasswordsinasecureareatopreventunauthorizedaccess
tothetransmitter.Ifthepasswordsarelost,resettingtheXNX
transmitterwillrequireaservicetechnician.
• WhentheXNXtransmitterisplacedinInhibitMode,alarmsare
silenced.Thiswillpreventanactualgaseventfrombeingreported.
InhibitModemustbelimitedtotestingandmaintenanceonly.Exit
InhibitModeaftertestingormaintenanceactivities.
• Honeywellrecommendsperiodicbumptests(every30daysorin
accordancewithcustomersiteprocedures)tothesensortoinsure
properoperationandcompliancewiththefunctionalsafetyratingof
theinstallation.
• Assometestgasesarehazardous,exhausttheflowhousingoutlettoa
safearea.DonotusetheXNXUniversalTransmitterinoxygen-enriched
atmospheres.(Inoxygen-enrichedatmospheres,theelectricalsafetyis
notgiven.)
• Exposuretodesensitizingorcontaminatingsubstancesor
concentrationscausingoperationofanyalarmmayaffectsensor
sensitivity.Followingsuchevents,itisrecommendedtoverifysensor
performancebyperformingafunctionalgastest(bumptest).
• Whenservicingorreplacingsensors,reducetheriskofignitionof
hazardousatmospherebydeclassifyingtheareaordisconnecting
theequipmentfromthesupplycircuitbeforeopeningthesensor
enclosure.Keeptheassemblytightlyclosedduringoperation.
• Takeappropriateprecautionswhenusingtoxic,flammable,and
pressurizedcylinders.
• Delaysresultingfromtransmissionerrorsbetweensensorand
transmitterextendresponsetimesT90bymorethanone-third.The
perioduntilfault
indicationis10seconds
.
• TheHARTinterfaceissubjectofthisEC-typeexaminationcertificate
onlyforthepurposeofconfigurationandmaintenance.

Honeywell XNX Specifications

General

Brand	Honeywell
Model	XNX
Category	Transmitter
Language	English