Honeywell XNX Technical Manual

XNX Universal Transmitter
Section 1 - Introduction
15
states�Twoalarmlevelscanbeset,allowing,forexample,alevel
1alarmfortheimmediateareawhenacertaingasconcentration
isdetectedandaplant-widelevel2alarmwhenagreatergas
concentrationisdetected�
Themaximumrefreshrateoftherelaysis2seconds�SeeSet
AlarmValuesformoreinformation�
1.3.3 Modbus
TheoptionalModbusinterfaceallowstheXNXtoconnectto
abusofdevicesandtransmitdatatoPLCsorcontrollers�
(Formoreinformation,seetheModbus

ProtocolManual)�
ConnectionstotheXNXaremadethroughapluggableterminal
blockontheModbusinterfacecircuitboard�ModbusRTU
protocolusesASCII/Hexprotocolsforcommunication�
Note:PODoptionsareeitherrelay,Modbus,orFoundationFieldbus.
1.3.4 Foundation Fieldbus
FoundationFieldbusisadigitalcommunicationsystemwhich
supportsseveraltypesofmessages�Unlikemanytraditional
systemswhichrequireasetofwiresforeachdevice,multiple
FoundationFieldbusdevicescanbeconnectedwitha
singlesetofwires�FoundationFieldbusovercomessome
ofthedisadvantagesofproprietarynetworksbyprovidinga
standardizednetworkforconnectingsystemsanddevices�
1.3.5 XNX Accessories
Pipe Mount Kit
ThePipeMountkit(1226A0358)allowstheXNXtobemounted
topipefrom2”-6”(50-150mm)indiameter�Thekitincludesthe
pipemountbracket,twocarriagebolts,nuts,andlockwashers�
Figure 8. Pipe-mounted XNX Transmitters
Calibration Gas Flow Adapter
Thecalibrationgasowadapterisusedtoapplycalibration
testgastothesensor�Itattachestothebottomofthesensor
andcanbettedwithoutremovingtheweatherproofcover�See
Section3-Calibrationforfurtherdetailsongascalibration�
Sensor Flow Adapter P/N
XNX EC S3KCAL
MPD 1226A0411
Sensepoint 02000-A-1645
705 00780-A-0035

Honeywell XNX Specifications

General

Ingress Protection	IP66/67
Product Type	Universal Transmitter
Enclosure Rating	IP66/67
Display	LCD
Communication Protocols	HART, Modbus, Foundation Fieldbus
Power Supply	24 VDC nominal, 18-32 VDC
Operating Temperature	-40°C to +65°C (-40°F to +149°F)
Material	Aluminum or Stainless Steel
Gas Types	Toxic, Oxygen, and Combustible gases
Output	4-20 mA
Relays	3 programmable relays
Approvals	ATEX, IECEx, UL, CSA
Sensor Compatibility	Electrochemical, catalytic, infrared, and other sensor types