XNX UNIVERSAL XNX Universal Transmitter Technical Manual

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XNX Universal Transmitter

Introduction

• 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.

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XNX Universal Transmitter Technical Manual - Page 8