Honeywell XNX Technical Manual

XNX Universal Transmitter
Section 1 - Introduction
11
1.1.2 20 mA/HART
®
Output
AllXNXTransmittersprovidea20mACurrentLoopwithHART
DigitalCommunicationwhichcanbeuserconguredforSink,
Source(3-Wire)orIsolated(4-Wire)electricalinterfacebasedon
installationrequirements�
The20mAcurrentloopoutputprovidesananalogindication
ofspecialstates,aproportionaloutputtogasconcentration
andoverrangeindicationperthetablebelow�Intheeventof
asimultaneousalarmandfault,analarmconditionwillalways
overrideawarningstate�
Output Description* Notes
1�0mA Fault
Special
State
Indication
2�0mA
Warm-up
Inhibit
BumpTest
Calibration
3�0mA Warning
4-20mA GasConcentration
21mA OverRange
*Alarmconditionsalwaystakepriorityoverfaultsandwarnings�
HARTProtocolprovidesdigitalcommunicationswiththeXNX
fromaremotecontrolsystemforConguration,Statusand
Diagnostics�(SeeAppendixAHARTProtocolforadditional
information)
1.1.3 Communications
TheXNXUniversalTransmitterisregistered
withtheHARTCommunicationFoundation�
ThetransmitterusesHARTover4-20mAasthestandard
communicationsprotocol�Additionaloptionalcommunication
interfacesareavailable:relaycommunication,Modbus,or
FoundationFieldbus�Eachcommunicationoptionhasa
dedicatedoptionboard�Foradditionalinformation,referto
Section1�3Options�
1.1.4 Certications
XNX-UT**-******VersionsareULclassiedandCSAlistedfor
installationinClassI,Division1,GroupsB,CandDHazardous
Locations�FMApprovalsevaluationincludesClassI,Zone
1,GroupsB,C,D,aswellasperformancetestsforspecic
sensor/transmittercombinations�CSA/FMcerticationdoes
notcoverdaisy-chainedXNXcombustiblegastransmitters,the
useofHART,Modbus,orFoundationFieldbusprotocolsfor
combustiblegasperformance�HART,Modbus,orFoundation
Fieldbusprotocolscanbeusedonlyfordatacollectionorrecord
keepingwithregardstocombustiblegas�TheECcartridge
2
and
ECremotemountkitareULclassiedtoCanandianandUS
standards�
XNX-AM**-*****versionsarecertiedtocomplywiththe
EuropeanCommunityATEXDirectiveandtheprescribed
protectionmethodsforinstallationinPotentiallyExplosive
Atmospheres�
XNX-BT**-*****versionsareULclassiedandINMETRO
approved(TÜVRhineland)forcompliancewithbothU�S�and
Brazilianstandards�
SeeSection6�2foradditionalinformationonapplicable
approvalsbypartnumberandSection6�2�1formarking�
2
“Cartridge”and“sensor”areusedinterchangeablyinthisdocument�

Honeywell XNX Specifications

General

Brand	Honeywell
Model	XNX
Category	Transmitter
Language	English