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Honeywell XNX SENSOR

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XNXTM Universal Transmitter

Technical Manual
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Safety Information
Table of Contents
Introduction
Installation and Operation

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Calibration
Maintenance
Warnings/Faults
Specifications

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Control Drawings
HARTđ Protocol
Modbus® Protocol


Warranty
Release 1 3/09


XNX Universal Transmitter
Safety





Ensure that this Operating Manual is read and understood BEFORE installing / operating / maintaining the equipment.
Pay particular attention to Warnings and Cautions.
All document Warnings are listed here and repeated where appropriate in the relevant chapter(s) of this Operating Manual.
Cautions appear in the sections/sub-sections of the document where they apply.

WARNINGS
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The XNX Universal Transmitter is certified and designed for installation and use worldwide in hazardous areas.
Installation must be in accordance with the recognized standards of the appropriate authority in the country concerned.
Access to the interior of the detector, when carrying out any work, must only be conducted by trained personnel.
Before carrying out any work ensure local regulations and site procedures are followed. Appropriate standards must be followed to maintain
the overall certification of the detector.
To reduce risk of ignition of hazardous atmospheres, conduit runs must have a seal fitting connected within 18 inches (45 cm) of the
enclosure.
To reduce the risk of ignition of hazardous atmosphere, de-classify the area or disconnect the equipment from the supply circuit before opening
the detector enclosure. Keep assembly tightly closed during operation.
Never open the XNX enclosure under power unless the area is known to be non hazardous.
The detector must be earthed/grounded for Intrinsic Safety, electrical safety and to limit the effects of radio frequency interference. An earth/
ground point is provided inside and outside the unit. The internal grounding shall be used as the primary equipment ground. The external
terminal is only a supplemental bonding connection where local authorities permit or require such a connection.
Take care when handling EC sensor cells as they may contain corrosive solutions.
Do not tamper or in any way disassemble the sensor cells.
Do not expose to temperatures outside the recommended range.
Do not expose sensor to organic solvents or flammable liquids.
At the end of their working life, sensors must be disposed of in an environmentally safe manner. Disposal should be according to local waste
management requirements and environmental legislation.
Alternatively, sensors may be securely packaged and returned to Honeywell Analytics clearly marked for environmental disposal.
Electrochemical cells should NOT be incinerated as they may emit toxic fumes.

Introduction

i



XNX Universal Transmitter
Information
Honeywell Analytics can take no responsibility for installation and/or use of its equipment if this is not done in accordance with the appropriate
issue and/or amendment of the Operating Manual.
The reader of this Technical Manual should ensure that it is appropriate in all details for the exact equipment to be installed and/or operated.
If in doubt, contact Honeywell Analytics for advice.
The following types of notices are used throughout this Technical Manual:

WARNING
Identifies a hazardous or unsafe practice which could result in severe
injury or death to personnel.

Caution
Identifies a hazardous or unsafe practice which could result in minor
injury to personnel, or product or property damage.
Note:
Identifies useful/additional information.
Every effort has been made to ensure the accuracy of our documents, however, Honeywell Analytics can assume no responsibility for any
errors or omissions in our documents or their consequences. Honeywell Analytics greatly appreciates being informed of any errors or omissions
that may be found in the contents of any of our documents. For information not covered in this document, or if there is a requirement to send
comments/corrections about this document, please contact Honeywell Analytics using the contact details given on the back cover of this
document.
Honeywell Analytics reserves the right to change or revise the information supplied in this document without notice and without
obligation to notify any person or organization of such revision or change. If information is required that does not appear in this
document, contact the local distributor/agent or Honeywell Analytics.
XNX is a registered trademark of Honeywell International.
HART® is a registered trademark of the HART Communication Foundation.
MODBUS® is a registered trademark of Schneider Automation Inc.
FoundationTM is a trademark of Fieldbus Foundation

Introduction

ii


XNX Universal Transmitter

TOC

Table of Contents
Safety
Information
1 Introduction
1.1 Product Description������������������������������������������������������� 1-2
1.1.1 Universal Transmitter����������������������������������������������� 1-2
1.1.2 Communications������������������������������������������������������ 1-2
1.1.3 Certifications������������������������������������������������������������ 1-2
1.2 Product Overview����������������������������������������������������������� 1-2
1.2.1 Enclosure����������������������������������������������������������������� 1-3
1.2.2 Cover����������������������������������������������������������������������� 1-3
1.2.3 POD ������������������������������������������������������������������������ 1-4
1.3 Options���������������������������������������������������������������������������� 1-4
1.3.1 Local HART®������������������������������������������������������������ 1-4
1.3.2 Relays���������������������������������������������������������������������� 1-4
1.3.3 Modbus®������������������������������������������������������������������ 1-4
1.3.4 XNX Accessories����������������������������������������������������� 1-5
1.4 The XNX Front Panel������������������������������������������������������� 1-6
1.4.1 Controls and Navigation������������������������������������������ 1-7
1.4.2 The General Status Screen������������������������������������� 1-7
1.4.3 Entering the Menu Structure������������������������������������ 1-9

1.5 Main Menu��������������������������������������������������������������������� 1-10
1.5.1 XNX Menu Map����������������������������������������������������� 1-11
2 Installation and Operation
2.1 Mounting and Location of Detectors���������������������������� 2-3
2.2.1 Mounting the XNX Universal Transmitter����������������� 2-3
2.2 Wiring the XNX���������������������������������������������������������������� 2-5
2.2.1 General Wiring Considerations�������������������������������� 2-5
2.2.2 Distance Considerations for Installation������������������ 2-5
Table of Contents

2.2.3 POD Connections���������������������������������������������������� 2-9
2.2.4 4-20mA Output, Common Connections and Power��2-10
2.2.5 Terminal Block Connections����������������������������������� 2-11
2.2.6 EC Personality Wiring�������������������������������������������� 2-12
XNX Electrochemical Sensor Installation������������ 2-13
2.2.7 mV Personality Wiring�������������������������������������������� 2-15
2.2.8 IR Personality Wiring��������������������������������������������� 2-17
Connecting a Searchpoint Optima Plus or Searchline
Excel������������������������������������������������������������������� 2-18
Connecting Generic mA Devices������������������������ 2-18
2.3 Options�������������������������������������������������������������������������� 2-21
2.3.1 Local HART® Handheld������������������������������������������ 2-21
2.3.2 Option Board Installation��������������������������������������� 2-23
2.3.3 Relays�������������������������������������������������������������������� 2-24
2.3.4 Modbus®���������������������������������������������������������������� 2-25
2.4 Powering the XNX for the First Time��������������������������� 2-26
2.4.1 XNX Units Configured for EC, mV, and IR
(except Searchline Excel) ���������������������������������������� 2-26
2.4.2 XNX IR Units Configured for Searchline Excel������ 2-27
2.5 Configuring the XNX Universal Transmitter��������������� 2-28

2.5.1
Configure Menu������������������������������������������������� 2-28
Select Language��������������������������������������������� 2-28
Set Date & Time��������������������������������������������� 2-29
Set mV Sensor Type��������������������������������������� 2-30
Set mA Sensor Type��������������������������������������� 2-31
Gas Selection��������������������������������������������������� 2-31
Range & Alarms��������������������������������������������� 2-32
Latching / Non-Latching���������������������������������� 2-33
iii


XNX Universal Transmitter
Table of Contents
? Event History������������������������������������������������� 2-49

Set Units���������������������������������������������������������� 2-34
mA Levels������������������������������������������������������� 2-34
Calibration Interval������������������������������������������ 2-35
� Accept New Sensor Type�������������������������������� 2-36
Beam Block Options������������������������������������� 2-36
Path Length���������������������������������������������������� 2-38
Unit ID������������������������������������������������������������� 2-39
Relay Options������������������������������������������������� 2-40
Fieldbus Options������������������������������������������� 2-40
Configure Security������������������������������������������� 2-42
2.6 Verifying the XNX Configuration��������������������������������� 2-43
2.6.1 Test Menu����������������������������������������������������������� 2-43
X Inhibit�������������������������������������������������������������� 2-43
Force mA Output�������������������������������������������� 2-44

Force Relays�������������������������������������������������� 2-44
Alarm/Fault Simulation����������������������������������� 2-45
2.6.2 ? Information Menu����������������������������������������������� 2-46
Alarm/Fault Status������������������������������������������ 2-46
Date & Time���������������������������������������������������� 2-46
Transmitter Data���������������������������������������������� 2-46
Transmitter Status������������������������������������������ 2-47
Sensor Data���������������������������������������������������� 2-47
Sensor Status������������������������������������������������� 2-48
Gas Data����������������������������������������������������������� 2-48
Range/Alarm Settings������������������������������������� 2-48
mA Level Settings������������������������������������������� 2-48
Fieldbus Settings������������������������������������������� 2-49
Relay Data������������������������������������������������������ 2-49

3 Calibration
3.1
Gas Calibration Menu������������������������������������������������ 3-2
3.2 Calibration����������������������������������������������������������������������� 3-2
3.2.1 Calibration Procedure���������������������������������������������� 3-2
3.2.2 Zero and Span Calibration for XNX EC Sensors����� 3-4
3.2.3 Zero and Span Calibration of XNX EC Hydrogen

Sulfide (H2S) Sensors��������������������������������������������������3-5
3.2.4 XNX EC Sensor Operational Life����������������������������� 3-5
3.2.5 Zero and Span Calibration for MPD Sensors���������������������3-6
3.2.6 MPD Flammable Sensor Operational Life��������������� 3-7
3.2.7 Calibrating the 705/705HT��������������������������������������� 3-7
3.2.8 Calibrating the Sensepoint/Sensepoint HT�������������� 3-7
3.2.9 Calibrating the Searchline Excel and


Searchpoint Optima Plus�������������������������������������������������� 3-7
3.3 Functional Gas Testing (Bump Test)����������������������������� 3-7
3.4
Calibrate mA Output ������������������������������������������������ 3-8
3.5
Align Excel (Searchline Excel)���������������������������������� 3-8
3.7
Soft Reset������������������������������������������������������������������� 3-9
4 Maintenance
4.1 MPD Sensor Cartridge Replacement���������������������������� 4-2
4.2 XNX EC Sensor Cartridge Replacement����������������������� 4-3
4.2.1 Replacing with the Same Cartridge Type����������������� 4-3
4.2.2 Replacing with a Different Cartridge Type��������������� 4-4
5 Warnings / Faults
5.1 Reset Messages�������������������������������������������������������������� 5-2
5.2 Alarm Messages ������������������������������������������������������������ 5-2
5.3 Warning Messages��������������������������������������������������������� 5-3

?

?

Table of Contents

iv


XNX Universal Transmitter
Table of Contents

5.4 Fault Messages��������������������������������������������������������������� 5-6
5.5 Informational Messages����������������������������������������������� 5-13
6 Specifications
6.1 Product Specifications��������������������������������������������������� 6-2
6.1.1 XNX EC Sensor Performance Data������������������������� 6-3
6.1.2 XNX EC Sensor Cross Sensitivity��������������������������� 6-4
6.1.3 XNX MPD Sensor Performance Data�������������������� 6-10
6.1.4 Other Sensor Performance Data��������������������������� 6-10
6.2 XNX Certifications by Part Number Series����������������� 6-11
6.2.1 XNX Labels������������������������������������������������������������ 6-14
UL Certification Labels���������������������������������������� 6-14
6.3 Ordering Information���������������������������������������������������� 6-15
6.3.1 XNX Universal Transmitter������������������������������������� 6-15
6.3.2 XNX EC Replacement Sensors����������������������������� 6-15
6.3.3 XNX EC Replacement Cells���������������������������������� 6-16
6.3.4 Multi Purpose Detector (MPD)������������������������������� 6-17
6.3.5 XNX Catalytic Bead and IR Replacement Sensor
Cartridges����������������������������������������������������������������������� 6-17
6.3.6 Options������������������������������������������������������������������ 6-17
6.3.7 Accessories/Spares����������������������������������������������� 6-18
7 Control Drawings
7.1 XNX Control Drawing����������������������������������������������������� 7-2
7.2 Remote Sensor Mount Control Drawing����������������������� 7-5
A HART® Protocol
A.1 HART® Interface��������������������������������������������������������������A-2
A.1.1 HART Sink, Source and Isolated Wiring��������������������A-4
A.1.2 DevComm PC-Based HART® Interface����������������������A-7
Overview��������������������������������������������������������������������������� A-7
Table of Contents


Functions�������������������������������������������������������������������������� A-8
A.1.3 Handheld Online Menu���������������������������������������������A-11
B Modbus® Protocol
B.1 Modbus and the XNX�����������������������������������������������������B-2
B.2 Modbus Registers����������������������������������������������������������B-3
C Warranty
Warranty Statement��������������������������������������������������������������C-2

v


XNX Universal Transmitter

1 Introduction

XNX Universal Transmitter Technical Manual

1-1

Release 1 (3/09)


XNX Universal Transmitter
1.1 Product Description

1.1.2 Communications

1.1.1 Universal Transmitter

The XNX Universal Transmitter uses HART® over 3-wire 4-20mA as

the standard communications protocol. An optional Modbus® interface
is available. See Section 1.3 Options or Section 2.3.4 Modbus for
more information.

The XNX Universal Transmitter is a comprehensive solution designed
to operate in hazardous locations and utilize one of three sensor
technologies or personalities to detect toxic or flammable and oxygen
depletion gas hazards using infrared, catalytic bead or electrochemicalbased sensors. XNX Electrochemical Sensors employ the patented
Reflex™ cell fault diagnosis routine. Reflex™ checks for cell presence,
cell dry out and cell open or short circuit. In the event of a cell failing
this test, a sensor fault code is displayed. Reflex™ is automatically
initiated by the transmitter at 8 hourly intervals. It is also initiated on
power up or sensor exchange.
XNX Universal Transmitter

1.1.3 Certifications
The XNX Universal Transmitter is certified and designed for installation
and use worldwide in hazardous areas. All platforms are approved for
use in a SIL 2 system. See Section 6 - Specifications for a complete
listing.

1.2 Product Overview
The XNX transmitter is comprised of the main parts shown below.

Searchline Excel

Cover
IR Devices
Generic 20mA Input


POD

Searchpoint Optima Plus

Intrinsically Safe (IS) Barrier for
Optional Local HART Interface

CL2

H2

NH3

ClO2

H 2S

NO

O2
PH3

CO

HF

NO2

SO2


Intrinsically Safe (IS) Barrier for
Electrochemical Sensor Interface
(when equipped)

mV Devices

XNX Electrochemical Sensors (EC)
705
705HT

Sensepoint
Sensepoint HT

Multi-Purpose
Detector (MPD)
Catalytic Bead
Infrared Flammable
Infrared Methane/CO2

Enclosure

Personality Sensor Type
Supported Sensors
IR
Point and Open-Path Infrared Searchpoint Optima Plus, Searchline Excel
705, 705HT, Sensepoint, Sensepoint HT, MPD
mV
Flammable and Toxic
(Catalytic Bead Flammable, IR Flammable and IR CO2)
Electrochemical sensors, with Hot Swap, pre-calibrated

XNX EC
Toxic and O2 Sensing
through Intrinsically Safe (IS) barrier

Figure 1-2. XNX Exploded View

Figure 1-1. XNX Universal Transmitter and Supported Sensing Technologies
Section 1 - Introduction

1-2


XNX Universal Transmitter
1.2.1 Enclosure
Available in either Stainless Steel or Aluminum, with 3/4” NPT (UL/CSA
only) or M25 (ATEX/IECEx only) threaded cable/conduit entries, the
XNX Universal Transmitter enclosure is explosion-proof and suitable
for use in -40°C to +65°C (-40°F to +149°F) operating conditions. A
5-coat marine finishing process provides the highest degree of corrosion
protection. For more information on performance specifications, see
Section 6 - Specifications.

Magnet

Reversible Screwdriver Bit

Figure 1-3. Magnetic Wand/Screwdriver

A locking screw integrated into the cover provides positive locking that
can be removed by using the supplied 2mm hex key.

Note:

The XNX enclosure is equipped with 5 threaded cable/conduit entries
providing functional and flexible configurations based on sensor and
option choices. See Figure 1-4 for cable/conduit entry assignments
and restrictions.

When attaching the cover or stopping plugs, be sure to coat the
threads with an anti-seize compound to prevent corrosion.
Note

A

While relay wiring can use any
available cable/conduit entry in
the XNX enclosure, do not use the
same cable/conduit entry for both
relay reset and relay signal lines to
avoid electrical noise.

E

Certified stopping plugs are included with the XNX to close the unused
cable/conduit entries. The number of stopping plugs varies dependent
upon configuration.
D

Caution
The stopping plugs are for use with the XNX only and should not be
used with any other device(s).


*

* Limited access due to
IS barrier if equipped with
electrochemical cell.

B

Option

Mounting lugs integral to the XNX enclosure allow easy installation
to a flat surface or 2”-6” (50-150mm) diameter pipe with optional Pipe
Mount Kit or Ceiling Mount Bracket Kit.

C

Position

Local HART Option

B

XNX Electrochemical Sensor - Local/Remote

C

®

MPD, 705 Series, Sensepoint Series


C

Searchpoint Optima Plus

1.2.2 Cover
Cover

The transmitter cover is supplied in
the identical material as specified for
the enclosure. A tempered glass
window requires use of the supplied
magnetic wand/screwdriver to
activate the four user interface
Cover Lock Screw
(requires 2mm hex key - included)
switches that are located on the front
of the display module. This allows for non intrusive set up and operation.
Tempered Glass Window

Section 1 - Introduction

1-3

A or E

Searchline Excel

Typically C


Remote Sensor Connection (except EC )

Any remaining

Searchpoint Optima Plus - Remote

Any remaining

Modbus

Any remaining

Relays

Any remaining

Power

Any remaining

®

Figure 1-4. XNX Universal Transmitter Cable/Conduit Entry Assignments
1.2 Product Overview


XNX Universal Transmitter
1.2.3 POD

1.3 Options


The POD (Personality, Options and Display) encloses circuit boards
for the display, personality module and optional interfaces.

1.3.1 Local HART®

The Personality circuit board determines the XNX behavior based on
the sensor type attached to the XNX and provides whatever interface
is necessary to the options available. Connection to the attached
sensor is made through the sensor connector accessed via a slot in
the POD housing.
The Option circuit boards vary dependent upon the option selected at
order time. Only one of the 3 available interface options (Modbus® or
Relays) can be attached to the XNX. When installed, connections to
the options are made to connectors at the bottom of the tray.

Available with any sensor technology or option, this option provides an
external access to the HART® interface in the XNX. An intrinsically safe
(IS) barrier inside the XNX allows the user full control using a HART®
Release 6 compatible hand-held interrogator for programming and
configuration. The external interface is installed in the lower left cable/
conduit entry of the XNX and is intrinsically safe. For more information
on HART®, see Appendix A.
Intrinsically Safe Barrier
for HART Interface

POD Cover
Display PCB
HART Handheld Interface
Connector w/Protective Cap


Personality PCB
Optional Relay PCB or
Modbus PCB or
Foundation Fieldbus PCB
POD Tray
Local HART® Connector
(when equipped)
Option Pluggable Terminal Block

.

Power and Personality
Pluggable Terminal Block

Figure 1-5. POD Exploded View

Section 1 - Introduction

Figure 1-6. XNX Universal Transmitter with HART® Interface IS Barrier

1.3.2 Relays
The relay option (XNX-Relay) provides 3 form “C” (SPDT) normally
open/normally closed (NO/NC) contacts for alarm and fault indication.
A remote reset is provided to silence alarms.
Note
Relays are not available with the Modbus® option.

1.3.3 Modbus®
One of the most common fieldbuses in the industry, the optional

Modbus® interface allows the XNX to connect to a bus of devices and
transmit data to PLCs or controllers (see Appendix B). Connections
to the XNX are made through a pluggable terminal block on the
1-4

1.2 Product Overview


XNX Universal Transmitter
Modbus® interface circuit board. Modbus® RTU protocol uses ASCII/
Hex protocols for communication.

Weatherproof Cap
The weatherproof cap protects the XNX sensors from
harsh weather.

1.3.4 XNX Accessories
The XNX Universal Transmitter has various accessories available as
detailed below.
Pipe Mount Kit
The Pipe Mount kit (1226A0358) allows the XNX to be mounted to pipe
from 2”-6” (50-150mm) in diameter. Kit includes: Pipe Mount Bracket,
(2) Carriage Bolts, Nuts and Lock Washers.

Sensor

Weatherproof Cap Sensor

XNX EC


Included

Sensepoint 02000-A-1640

Weatherproof Cap

MPD

02000A1640

705

00780-A-2076

Remote Sensor Mounting Kit for XNX EC Sensors
The remote sensor mounting kit
(S3KRMK) allows the XNX EC sensors
to be remotely mounted via an IS cable
kit, up to 50 feet (15 meters) from the
transmitter. The kit includes 50 feet of
shielded cable, cable glands and remote
terminal box. The cable can be cut to the
required length then terminated at the remote terminal box.
Collecting Cone
The collecting cone improves detection of lighter-than-air gases such
as hydrogen and methane.

Calibration Gas Flow Adapter
The calibration gas flow adapter is used to apply calibration test gas to
the sensor. It attaches onto the bottom of the sensor and can be fitted

without removing the weatherproof cover. See Section 3 - Calibration
for further details on calibrating the detector.
Sensor
XNX EC
MPD
Section 1 - Introduction

Flow Adapter
S3KCAL
1226A0411

Sensor
XNX EC
MPD

Collecting Cone Sensor
Collecting Cone
SPPPCC
Sensepoint 02000-A-1642
02000-A-1642 705
02000-A-1642

Ceiling Mount Bracket Kit
The optional Ceiling Mount Bracket Kit (1226A0355)
allows the XNX to be mounted to the ceiling. The
kit includes (2) Stainless Steel Ceiling Mount
Brackets, bolts and nuts.

Sensor
Flow Adapter

Sensepoint 02000-A-1645
705
00780-A-0035
1-5

1.3 Options


XNX Universal Transmitter
Remote Gassing Kit

Device Adapter

Tube Cap

1/4 in (6mm) I.D.
Teflon® Tubing

Mounting Bracket

1.4 The XNX Front Panel
(1226A0354) The Remote Gassing Kit
enables gas to be applied remotely for
performing functional response checks
(bump tests). Kit Includes: 50’ Teflon ®
tubing, mounting bracket, tube cap and
device adapters in 1/4” and 1/8” (6.3 mm
and 3.2 mm) ID to attach to bump test ports
on the weatherproof cap of your device.


The XNX uses magnetic switches to enable non intrusive operation.
To activate a magnetic switch, hold the factory-supplied magnet up
to the glass window and slowly swipe the magnet directly over the
shaded area.
For best results when making a selection, hold the magnetic wand/
screwdriver as illustrated below.

Duct Mount Kit
The duct mounting kit (3001A0408) can be used with the EC sensor
to allow detection of O2, CO, H2 and H2S gases in ducts. When
combined with the MPD Interface Adapter (1226A0382), the duct
mounting kit can accommodate the MPD to detect flammable gases
in a duct application. The duct mount kit includes the adapter, gasket
and required fasteners. The MPD Interface Adapter includes only the
adapter and requires the 3001A0408 duct mount kit.

Switch Actuation
Visual Indicator

1226A0382 MPD Adapter Ring

Enter/Accept

3001A0408 EC/MPD Duct Adapter Kit

Move Right / Increment Value

Section 1 - Introduction

1-6


Escape/Back

Move Left / Decrement Value

1.3 Options


XNX Universal Transmitter
A decal illustrating the proper method for actuating the magnetic
switches is placed on the POD of each XNX.

Power LED
(Green)

Alarm LED
(Red)

Alarm

Power

Fault LED
(Yellow)

Fault

Wand Instruction Decal
Alarm


Power

Fault








-

XNX

Escape

+

Enter / Accept
-

Universal Transmitter

XNX

+

Universal Transmitter


Switch Actuation
Visual Indicator
Move Right
Increment Value

Move Left
Decrement Value

Figure 1-8. The XNX Front Panel Display

1.4.1 Controls and Navigation


Figure 1-7. Operation Decal

Enter / Accept

A visual indication of the switch actuation will appear in the lower right
corner of the XNX display each time the switch is activated.

Escape / Back



Use Escape key to return to previous menus or to answer “NO” to
system prompts

Use the Left / Decrement arrow to move through menu options or
Move Left / Decrement Value decrement values when entering text or numbers


The switch is actuated by the flux lines between the poles of the
magnet. Using this actuation method provides the best performance
overcoming interface variability.
In some menus where the displayed value can be changed, the magnet
must be swiped over the switch to cause the numeral on the display
to advance through the available values. Use the ✖ switch to return
to a previous menu or field.

The Enter/Accept key is used to access menus, accept changes and
to respond “YES” to system prompts

Use the Right / Increment arrow to move through menu options or
Move Right / Increment Value Increment values when entering text or numbers

1.4.2 The General Status Screen

For the purposes of this manual, the instruction to use ✓ , ✖ , or ,
means to activate the relevant magnetic switch as described above.
Figure 1-9. The General Status Screen
Section 1 - Introduction

1-7

1.4 The XNX Front Panel


XNX Universal Transmitter
The General Status Screen provides a visual indication of the status
of the XNX. Warnings, faults, alarm levels and current concentration
levels are displayed continuously.


Fault Icon

Fault Code

Current Concentration Level
(Numeric)
Status Indicator
Current Concentration Level
(Bar Graph)

Figure 1-12. General Status Fault Detail

Concentration Units
Full Scale

When an alarm icon
is displayed, the target gas concentration
exceeds one or both preset alarm levels, the General Status Screen
displays the gas concentration and alarm level exceeded.

Alarm 2 Set Point
Alarm 1 Set Point

Figure 1-10. General Status Screen - Normal Operating Mode

The Normal Operating Mode icon gives visual indication of proper
operation. The XNX display also shows the concentration level of the
target gas in two different ways. The first, found in the upper right corner
of the display, shows a numeric value in the units selected (ppm, ppb,

%LEL, %VOL). The second concentration display is shown in the form
of a bar graph representing the current concentration against full scale
and in relation to the defined alarm levels (for more information on
setting range and alarm levels, see Range and Alarms).

Target Gas
Concentration

Figure 1-13. General Status Alarm Detail

In an overrange condition, the alarm icon will display but the target gas
concentration bar graph and alarm setpoints will flash, see illustration below.
Alarm Level Triggered
Full Scale
Concentration

appears and
When a warning is triggered, the Warning icon
information is displayed on the General Status Screen. The information
displayed includes the gas concentration and the warning code (see
Section 5 - Warnings/Faults for more warning code information).
Warning Icon

Alarm Level Triggered

Alarm Icon

Warning Code

Concentration Bar, Alarm Setpoints Flash


Figure 1-14. General Status Overrange Detail

In addition to the graphic Alarm, Fault and Warning indicators, the LEDs
on the front panel will flash in a pattern based on the condition:
Condition

LED
Red

Figure 1-11. General Status Warning Detail

Alarm 1

Solid

If the fault icon is displayed, a fault condition has been triggered and
the display will alternate the display of the target gas concentration
and the fault code (see Section 5 - Warnings/Faults for more fault
code information).

Alarm 2

Flashing

Section 1 - Introduction

1-8

Green


Warning

Solid

Fault
Health

Yellow

Flashing
Flashing

1.4 The XNX Front Panel


XNX Universal Transmitter
1.4.3 Entering the Menu Structure
Swiping the magnet over the magnetic switch ✓ or ✖ gives the user
access to the XNX to reset faults and/or alarms, display current settings
or make adjustments to the device.
NOTE:
If the Easy Reset option is set to Lock, users will not have access
to reset alarms and faults. For more information on Security
Settings for the XNX, see Configure Security.
From the General Status menu, if
the ✖ or ‘escape’ magnetic switch
is swiped, the Alarm Reset Screen
activates. This allows any user
to silence alarms and reset faults

Figure 1-15. Alarm Reset Screen generated by the XNX.
Using the ✓ switch resets all alarms and faults and returns to the
General Status Screen, choosing ✖ will return to the General Status
Screen without resetting the alarms and faults.

Warning
The factory-set passcodes must be reset to prevent unauthorized
access to the XNX menus.
Once the Passcode Screen is displayed, the first passcode digit is
highlighted. Use the
switches to increment or decrement through
the values. Once the correct value is displayed for the first digit, ✓
accepts the value and moves to the next digit or ✖ will move to the
previous digit of the passcode.



Figure 1-17. Entering the Passcode

Repeat for each of the remaining digits in the passcode. If the passcode
is not entered correctly, the Invalid Passcode screen is displayed and
the user is returned to the General Status screen.

Using the ✖ switch will return the
user to the General Status Menu. If
the user selects ✓ from the General
Status menu, it will activate the
Figure 1-16. The Passcode Screen passcode screen.
There are two authorization levels that control access based upon
the security level of the user. The passcodes for both levels are set at

“0000” from the factory, and must be reset after installation to control
access. To change the passcodes, see Configure Security.
Level 1 Routine Maintenance

Section 1 - Introduction

Figure 1-18. Invalid Passcode Screen

Level 2 Technician and Password Admin

1-9

1.4 The XNX Front Panel


XNX Universal Transmitter
1.5 Main Menu
Once the proper passcode has been entered, the XNX displays the
Main Menu.

Figure 1-19. The Main Menu

From the Main Menu, a Level 1 user can:
• display the current settings/configuration
• test the XNX
• calibrate and bump test the XNX
• configure the unit for language, date and time
The Main Menu consists of the following options:
?


Information
Menu

Displays current settings for the XNX including
optional Relays and Modbus®
Provides access to tools and settings to allow
Test Menu
simulation of gas events to test the system
Gas Calibration The XNX interface to calibrate sensors attached
Menu
directly to the XNX
Configure
Access to settings to configure the XNX and the
Menu
devices connected to it to your environment

Section 1 - Introduction

Section 2.5.3
Section 2.5.2
Section 3.1
Section 2.5.1

1-10

1.5 Main Menu


XNX Universal Transmitter
1.5.1 XNX Menu Map

Status Display







Alarm/Fault Reset
Display

Main Menu

Passcode Display

Information

Configure

Test

Calibrate

Inhibit

Gas
Calibration

Select
Language


Latching /
Non-Latching

Calibration
Interval

mA Levels

Fieldbus
Options2

Accept New
Sensor Type5, 6

Relay
Options1

?

?

Gas Data

Date & Time

Range/Alarm
Settings

Force mA

Output

Bump Test

Set Date &
Time

Transmitter
Data
Transmitter
Status

mA Level
Settings

Force Relay1

Calibrate mA
Output

Set mV
Sensor Type6

Fieldbus
Settings2
Relay
Settings1

Alarm/Fault
Simulation


Align Excel4

Set mA
Sensor Type3, 4

Beam Block
Options4

Set Units7

Soft Reset3, 4

Gas
Selection

Path Length4

Configure
Security

Range &
Alarms

Unit ID

Sensor Data

?


X

Alarm/Fault
Status

Sensor
Status

Section 1 - Introduction

? Event
History

Optional Relay Only
Optional Foundation Fieldbus or Modbus Only
Searchpoint Optima Only
4
Searchline Excel Only
5
Electrochemical Sensor Only
6
Catalytic Bead Sensor Only
7
mV and ECC only
1
2
3

1-11




1.5 Main Menu


XNX Universal Transmitter

2 Installation and
Operation

XNX Universal Transmitter Technical Manual

2-1

Release 1 (3/09)


XNX Universal Transmitter
Warnings
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The XNX Universal Transmitter is certified and designed for installation and use worldwide in hazardous areas.
Installation must be in accordance with the recognized standards of the appropriate authority in the country concerned.
Access to the interior of the detector, when carrying out any work, must only be conducted by trained personnel.
Before carrying out any work ensure local regulations and site procedures are followed. Appropriate standards must be followed to maintain the
overall certification of the detector.
To reduce the risk of ignition of hazardous atmosphere, de-classify the area or disconnect the equipment from the supply circuit before opening
the detector enclosure. Keep assembly tightly closed during operation.
Never open the XNX enclosure under power unless the area is known to be non hazardous.
The detector must be earthed/grounded for Intrinsic Safety, electrical safety and to limit the effects of radio frequency interference. An earth/ground
point is provided inside and outside the unit. The internal grounding shall be used as the primary equipment ground. The external terminal is
only a supplemental bonding connection where local authorities permit or require such a connection.
Take care when handling EC sensor cells as they may contain corrosive solutions.
Do not tamper or in any way disassemble the sensor cells.
Do not expose to temperatures outside the recommended range.
Do not expose sensor to organic solvents or flammable liquids.
At the end of their working life, sensors must be disposed of in an environmentally safe manner. Disposal should be according to local waste
management requirements and environmental legislation.
Alternatively, sensors may be securely packaged and returned to Honeywell Analytics clearly marked for environmental disposal.
Electrochemical cells should NOT be incinerated as they may emit toxic fumes.

Hazardous Locations Installation Requirements (UL/CSA)
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To reduce the risk of ignition of hazardous atmospheres, conduit runs must have a pour gland installed within 18 inches (457mm) of enclosure
All ¾ inch NPT conduit, stopping plugs and adapters must be installed with 5 ¼ threads (minimum) engaged to Maintain Explosion Proof rating
The XNX Cover Assembly must be fully seated to enclosure 9 threads (minimum) to maintain Explosion Proof rating
Stopping Plugs supplied (Honeywell Part Number 1226-0258) are approved for use ONLY with the XNX Universal Transmitter.
For units fitted with the Optional Relay Module: Relay Contact Ratings are 250 VAC 5A, 24 VDC 5A Resistive Loads Only
Terminal block screws should be tightened to 4.5 Lb/in maximum
Reference XNX Control Drawing 1226E0402 for additional information regarding IS function (Local HART and EC Personality).

Section 2 - Installation and Operation

2-2


XNX Universal Transmitter
2.1 Mounting and Location of Detectors

7.75"
196.85 mm
6.00"
15.4 mm
5.6"
124.24 mm

Caution
The location of the transmitters and sensors should be made in
accordance with any relevant local and national legislation, standards

or codes of practice. Always replace detectors with a detector of the
same type. The detector should be mounted where the gas is most
likely to be present. The following points should be noted when locating
gas detectors.

2.054"
52.18mm
0.625"
15.88mm

0.55"
14.35 mm
1.768"
44.90 mm
1.768"
44.90 mm
1.67"
42.41 mm

• When locating detectors consider the possible damage caused
by natural events e.g. rain or flooding.
• Consider ease of access for functional testing and servicing.
• Consider how escaping gas may behave due to natural or forced
air currents.

1.2"
31.75mm

6.138"
158.75mm

3.176"
80.67 mm

0.945"
24mm

Allow 11" 280mm
for Maint./Service

XNX with
Searchpoint Optima Plus

The placement of detectors should be determined following the
advice of experts having specialist knowledge of gas dispersion,
experts having knowledge of the process plant system and
equipment involved, safety and engineering personnel. The
agreement reached on the location of detectors should be
recorded.

6"
152 mm
w/sun shield

Note

4.48"
113.8 mm

4"
101.6mm


2.2.1 Mounting the XNX Universal Transmitter
The XNX Universal Transmitter can be mounted in a number of different
methods using the integral mounting tabs.
Using the mounting tabs, the XNX can be attached to:
• flat wall surface
ã Unistrutđ

Allow
12"
305mm
For
Maintenance
Service

XNX with MPD or Local EC Sensor

Figure 2-1. XNX Universal Transmitter Mounting Dimensions and
Clearances

With the optional Pipe Mount kit, the XNX can be mounted to pipe of
diameter 2” to 6” (50 to 150mm).
A ceiling mount bracket kit (1226A0358) is also available.
Section 2 - Installation and Operation

2-3

2.1 Mounting and Location of Detectors



XNX Universal Transmitter
Integral Mounting Lugs

Warning
When the XNX is equipped with the optional Remote Mount Kit, the
remote sensor MUST be securely mounted to a fixed position. The
Remote Sensor Kit is not intended to be used as a hand-held detector.
The XNX is configured with 5 cable/conduit entries built into the
housing for wiring and mounting sensors; Figure 2-2 provides the
guidelines to proper installation of the XNX.
Note

A

While relay wiring can use any
available cable/conduit entry in
the XNX enclosure, do not use the
same cable/conduit entry for both
relay reset and relay signal lines to
avoid electrical noise.

E

D

*

* Limited access due to
IS barrier if equipped with
electrochemical cell.


B

Option
C

Position

Local HART Option

B

XNX Electrochemical Sensor - Local/Remote

C

MPD, 705 Series, Sensepoint Series

C

®

Searchpoint Optima Plus
Searchline Excel

Figure 2-3. Integral Mounting Lugs and Optional Pipe and Ceiling Mounts

A or E
Typically C


Remote Sensor Connection (except EC )

Any remaining

Searchpoint Optima Plus - Remote

Any remaining

Modbus®

Any remaining

Relays

Any remaining

Power

Any remaining

Figure 2-2. XNX Universal Transmitter Cable/Conduit Entry Assignments
Section 2 - Installation and Operation

2-4

2.1 Mounting and Location of Detectors


XNX Universal Transmitter
2.2 Wiring the XNX


2.2.1 General Wiring Considerations

The XNX is available in 3 basic personalities (versions) which
support a variety of detectors and applications. Each of the available
personalities use dedicated interface boards. Pluggable terminal blocks
are used for easy connection and service. The personality boards and
optional interfaces are enclosed in the electronics POD (Personality,
Options and Display).

For proper operation of the XNX Universal Transmitter and sensor
technologies, consideration of wiring induced voltage drops, transient
electrical noise and dissimilar earth ground potentials is imperative in
the design and installation of the system.

The Personality circuit board determines the XNX behavior based on
the sensor type attached to the XNX interface (See Figure 2-7).
The table below defines the three XNX transmitter configurations and
the sensors each support.
XNX IR Personality

Searchline Excel

XNX EC Personality

Searchpoint Optima Plus Local/
Remote

Generic mA Sensors


XNX EC Sensor
XNX EC Sensor Remote Mount Kit

Loading
Wiring for DC power, 4-20mA signal, remote wiring to sensors must
be sized sufficiently to provide sufficient voltages for the line length
and the loads that will be used.
Isolation
Isolating power and signal carrying conductors is recommended.
Circuit Protection
Supply circuits must provide over current protection. Class 2 power
supplies are required for 24 volt DC supply. Consider inrush current
in specifying any DC supply. Power supply range is 16 to 32 VDC for
EC and mV versions, 18 to 32 VDC for Searchpoint Optima Plus and
Searchline Excel and 16 to 32 VDC dependent on the limitations of
device for the generic 4-20mA input.
Loads

XNX mV Personality

The use of high inrush or inductive loads may affect the performance
of the XNX. For best reliability use resistive loads only.

2.2.2 Distance Considerations for Installation
705 Local / Remote

MPD Local (cat bead and IR)

Sensepoint Local / Remote


705HT Local / Remote

MPD Remote

Sensepoint PPM Local/Remote
Sensepoint HT Remote

Providing power to the transmitter is the factor that will determine the
maximum distance of the installation. The 4-20 mA output signal will
easily handle the distance back to the control equipment.

Before wiring the XNX, confirm the correct personality boards and
options are installed.

The primary factors determining distance are: minimum operating
voltage of the transmitter and/or sensor; maximum current draw of the
transmitter/sensor, resistance of the wire used, power supply voltage
and current capacity of power supply.

Caution

Section 2 - Installation and Operation

2-5

2.2 Wiring the XNX


XNX Universal Transmitter
An additional consideration is the type of installation; specifically, how

many transmitters/sensors are drawing power from the same power
supply and whether these transmitters are using the same pair of wires
(“daisy-chain”) or have their own connections.
Types of Installations

Class 2
Power Supply

There are three basic types of installation: a single transmitter;
multiple transmitters connected to a single power source; and multiple
transmitters connected in a “daisy-chain” configuration.
Single Transmitter
This is the simplest type of installation. It consists of a single XNX
transmitter installation per power source.

Figure 2-5. Multiple Transmitters Powered by a Single Power Supply

Advantages:
• Maximum distance between power source and transmitters.
• Fewer power sources.
Disadvantages:
• Larger power source will be needed.
• If a power source fails, several monitoring points fail.
Multiple Transmitters Connected in a “Daisy-Chain”
Configuration

Class 2
Power Supply

Class 2

Power Supply

Class 2
Power Supply

This configuration consists of two or more transmitters installed in
a line. The power connections are installed as an extension of the
previous transmitter, with the first transmitter being the only one
actually wired to the power source.

Figure 2-4. Single Transmitter Installation

Advantages:
• Maximum distance between power source and transmitter.
• Smaller power source.
• If a power source fails, only one monitoring point fails.

Class 2
Power Supply

Disadvantages:
• Multiple transmitters require multiple power sources.

Figure 2-6. “Daisy-Chained” Transmitters from One Power Supply

Multiple Transmitters Connected to a Single Power Source
This is two or more transmitters sharing a single power source with each
transmitter having its own dedicated wiring to the power source.

Advantages:

• Less wire needed for installation.
• Fewer power sources.
Disadvantages:
• Larger power source will be needed.

Section 2 - Installation and Operation

2-6

2.2 Wiring the XNX


XNX Universal Transmitter
• Shorter distance between power source and transmitters.
• If a power source fails, several monitoring points go out.

is being drawn through the wire; more power means more loss. If too
much voltage is lost in the wiring, there may not be enough voltage
at the distant point to allow the transmitter to operate.

Power Source Selection
For each type of installation, selection of power supply is important.
Power supplies are rated by voltage and power. The nominal voltage
for all XNX transmitters is 24V and the power required depends on
the number of points using the same power supply.

Distance Chart for Single Transmitter Distances
For installations that have dedicated wiring between the transmitter
and the power supply, use the following chart. These distances assume
stranded wire is used.


As a general guideline, the power supply should be capable of providing
more power than is required by the installation. A 10 watt power supply
is fine for a single XNX mV with catalytic sensor (6.5 watts required)
but is not a good idea for a single XNX IR with Searchpoint Optima
Plus (10 watts required).
To determine the wattage required, add the maximum power
requirements of all the points that will be sharing the power supply.
For example, two XNX mV transmitters with catalytic sensors (6.5
watts each) and one XNX IR with Searchpoint Optima Plus (10 watts)
require a 23 watt power supply (absolute minimum). A 25 watt power
supply will probably handle this installation, but a 30 watt power supply
will be a better choice.

OR
Class 2
Power Supply

Note

The power requirements for different transmitter configurations are:
• XNX EC (Toxic): 6.2 watts
• XNX mV (Catalytic): 6.5 watts
• XNX IR with Searchpoint Optima Plus: 9.7 watts
• XNX IR with Searchline Excel: 13.2 watts

If multiple transmitters are using the same power supply, make
sure the power supply wattage rating is high enough to power
all transmitters simultaneously.


XNX mV or EC
With Sensor
XNX IR with
Searchpoint Optima Plus
XNX IR with
Searchline Excel

Wire Selection

Class 2
Power Supply

Single Transmitter Distances
18 AWG
16 AWG
14 AWG
12 AWG
[1.0 mm2]
[1.5 mm2]
[2.0 mm2]
[3.5 mm2]
1140 feet
1810 feet
2890 feet
4620 feet
[347 meters] [551 meters] [880 meters] [1408 meters]
660 feet
1060 feet
1690 feet
2690 feet

[201 meters] [323 meters] [515 meters] [820 meters]
550 feet
890 feet
1410 feet
2260 feet
[168 meters] [270 meters] [430 meters] [690 meters]

The type of wire used for connections has an effect on the distance
of the installation. This is because some of the voltage is lost in the
wire on the way to the transmitter.
Thinner wire (i.e. 18 AWG) will lose more voltage than thicker wire (i.e.
12 AWG). The amount of voltage lost depends on how much power
Section 2 - Installation and Operation

2-7

2.2 Wiring the XNX


XNX Universal Transmitter
“Daisy-Chained” Transmitter Distances
It is difficult to calculate distances for this configuration. There are many
factors to be considered: distance from control room to first transmitter,
distance between transmitters, sensor types, etc. A few selected
scenarios are presented here to provide a base to work from.
Transmitter 1

Transmitter 2

Transmitter 3


Transmitter 4

Transmitter 5

Class 2
Power Supply

“d”

“d”

“d”

“d”

XNX mV or EC
With Sensor
XNX IR with
Searchpoint Optima Plus
XNX IR with
Searchline Excel

4 Transmitters - Distance “d”
18 AWG
16 AWG
[1.0 mm2]
[1.5 mm2]
110 feet
180 feet

[33 meters]
[55 meters]
65 feet
105 feet
[20 meters]
[32 meters]
55 feet
85 feet
[17 meters]
[26 meters]

14 AWG
[2.0 mm2]
290 feet
[88 meters]
165 feet
[50 meters]
140 feet
[43 meters]

12 AWG
[3.5 mm2]
460 feet
[140 meters]
270 feet
[82 meters]
225 feet
[68 meters]

XNX mV or EC

With Sensor
XNX IR with
Searchpoint Optima Plus
XNX IR with
Searchline Excel

5 Transmitters - Distance “d”
18 AWG
16 AWG
[1.0 mm2]
[1.5 mm2]
75 feet
120 feet
[23 meters]
[36 meters]
45 feet
70 feet
[13 meters]
[21 meters]
35 feet
55 feet
[11 meters]
[17 meters]

14 AWG
[2.0 mm2]
190 feet
[58 meters]
110 feet
[33 meters]

90 feet
[27 meters]

12 AWG
[3.5 mm2]
300 feet
[91 meters]
180 feet
[55 meters]
150 feet
[46 meters]

“d”

1. Several transmitters equally spaced from themselves and the
power source.

XNX mV or EC
With Sensor
XNX IR with
Searchpoint Optima Plus
XNX IR with
Searchline Excel

2 Transmitters - Distance “d”
18 AWG
16 AWG
14 AWG
[1.0 mm2]
[1.5 mm2]

[2.0 mm2]
380 feet
600 feet
960 feet
[115 meters] [183 meters] [292 meters]
220 feet
350 feet
560 feet
[67 meters] [106 meters] [170 meters]
185 feet
295 feet
470 feet
[56 meters]
[90 meters] [143 meters]

12 AWG
[3.5 mm2]
1540 feet
[469 meters]
900 feet
[274 meters]
750 feet
[229 meters]

XNX mV or EC
With Sensor
XNX IR with
Searchpoint Optima Plus
XNX IR with
Searchline Excel


3 Transmitters - Distance “d”
18 AWG
16 AWG
14 AWG
[1.0 mm2]
[1.5 mm2]
[2.0 mm2]
190 feet
300 feet
480 feet
[58 meters]
[91 meters] [146 meters]
110 feet
175 feet
280 feet
[33 meters]
[53 meters]
[85 meters]
90 feet
145 feet
235 feet
[27 meters]
[44 meters]
[71 meters]

12 AWG
[3.5 mm2]
770 feet
[234 meters]

450 feet
[137 meters]
375 feet
[114 meters]

Section 2 - Installation and Operation



2. Several transmitters installed in pairs with each pair equally
spaced from themselves and the power source. These distances
assume the paired transmitters are installed within 10 feet [3
meters] of each other.
Transmitters 1 and 2

Transmitters 3 and 4

Transmitters 5 and 6

Class 2
Power Supply

“d”

2-8

“d”

“d”


2.2 Wiring the XNX


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