XNX Training Presentation
Training Presentation
XNX
‘Premium’ Gas Detection
• Wide range of markets and applications
including:
- Refineries and chemical plants, onshore oil and
gas terminals, production platforms, exploration
and drilling. Other ‘socially aware/image
conscious’ industry leading companies.
• Greater focus on performance,
integration and long term ownership
costs over initial cost.
• We add value by offering:
- Best solution to each application
- Meeting / exceeding performance standards /
requirements
- Integrating as necessary to other systems
- Reducing service/ongoing maintenance costs
• Create long term relationships
• Reduce price pressure by being
specified
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Product Training Presentation XNX rev 2
‘Premium’ Gas Detection
• There are many different applications for flammable,
toxic and Oxygen gas detection.
• Industrial processes increasingly involve the use and
manufacture of highly dangerous substances,
particularly toxic and combustible gases.
• Inevitably, occasional escapes of gas occur, which
create a potential hazard to the industrial plant, its
employees and people living nearby.
• Worldwide incidents involving asphyxiation, explosions
and loss of life, are a constant reminder of this problem.
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Product Training Presentation XNX rev 2
Gas Detection Applications
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Product Training Presentation XNX rev 2
Location of Detectors
• Detectors should be mounted where the gas is most
likely to be present.
• Locations requiring the most protection in an industrial
plant would be around gas boilers, compressors,
pressurised storage tanks, cylinders or pipelines.
• Areas where leaks are most likely to occur are valves,
gauges, flanges, T-joints, filling or draining connections
etc.
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Product Training Presentation XNX rev 2
Sensor Location Considerations
• To detect gases that are lighter than air
(e.g. Methane and Ammonia), detectors
should be mounted at high level and
preferably use a collecting cone
• To detect heavier than air gases (e.g.
Butane and Sulphur Dioxide), detectors
should be mounted at a low level
• Consider how escaping gas may behave
due to natural or forced air currents.
Mount detectors in ventilation ducts if
appropriate
• When locating detectors consider the
possible damage caused by natural
events e.g. rain or flooding. For detectors
mounted outdoors it is preferable to use
the weather protection assembly
• Use a detector sunshade if locating a
detector in a hot climate and in direct sun
• Consider the process conditions. Butane
and Ammonia, for instance are normally
heavier than air, but if released from a
process line that is at an elevated
temperature and/or under pressure, the
gas may rise rather than fall
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• Detectors should be positioned a little way
back from high pressure parts to allow
gas clouds to form. Otherwise any leak of
gas is likely to pass by in a high speed jet
and not be detected
• Consider ease of access for functional
testing and servicing
• Detectors should be installed at the
designated location with the detector
pointing downwards (except optima+).
• This ensures that dust or water will not
collect on the front of the sensor and stop
the gas entering the detector
• When siting open path infrared devices it
is important to ensure that there is no
permanent obscuration or blocking of the
IR beam. Short term blockage from
vehicles, site personnel, birds etc can be
accommodated
• Ensure the structures that open path
devices are mounted to are sturdy and
not susceptible to vibration
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Product Training Presentation XNX rev 2
Detector Installation Options
Ceiling Mounted
Duct Mounted
Pipe Mounted
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Sampling System
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Wall Mounted
Product Training Presentation XNX rev 2
Typical System Configurations
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Product Training Presentation XNX rev 2
Example of Small System
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Product Training Presentation XNX rev 2
Introducing… X (inputs) ‘n’ X (outputs)
*
*Pending
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Product Training Presentation XNX rev 2
XNX Product Overview
• A 3 or 4 wire sink, source or
isolated 4-20mA output with
HART® universal transmitter
• For use with all Honeywell
Analytics gas detection
technologies (catalytic, EC and
IR)
• Compliant with the latest
certification standards
• New range of XNX EC toxic and
flammable catalytic and IR MPD
sensors
• Common transmitter for all
sensors
• HART® over 4-20mA as
standard
• Optional relays, local HART®
port, Modbus® or Foundation
Fieldbus™ (pending) outputs
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Product Training Presentation XNX rev 2
Configuration to Customer Requirements
HART IS Port
IS barrier for
HART interface
IS HART Port
with cover
MPD Sensor
• Serviceable
• Catalytic & IR
• Stainless Steel
Sensepoint ppm & HT
XNX EC Sensor
IS HART Port
with cover (if
fitted)
• Serviceable
• Stainless Steel
• IS Hot Swap
(Aluminium LM25 or 316 STST)
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Product Training Presentation XNX rev 2
XNX Sensors
• Compatible with full range of HA sensor technologies
- Catalytic, Infrared and EC Sensors
• New Multi Purpose Detector (MPD)
-
Smart sensor with plug in catalytic and IR cartridges
Serviceable Stainless steel sensor housing
Catalytic: Flammable gases in the range 0-100%LEL
IR: Hydrocarbon gases in the range 0-100%LEL (0-5%Vol) and CO2 0-5%Vol
• New XNX EC Sensor
- Smart sensor with plug in toxic and oxygen sensor cartridges
- Serviceable Stainless steel sensor
- Intrinsically Safe sensor socket allowing ‘hot swap’ without the need for a
hot work permit.
• Compatible with existing HA sensors
- Sensepoint (and 705) High Temperature and PPM (0-10%LEL or 10,000ppm)
- Searchpoint Optima and Searchline Excel
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Product Training Presentation XNX rev 2
ReflexTM Detection Cell Diagnostics
• ReflexTM a Honeywell Analytics patented fault
diagnostic routine for electrochemical cells
• ReflexTM increases operator confidence of detector
operability and availability
• ReflexTM initiated automatically by the transmitter
- On power up
- Sensor exchange
- At 8 hourly intervals during operation
• ReflexTM checks for:
- Cell presence
- Cell dry out
- Cell open circuit and cell short circuit
- (Note: Not relevant for O2 detection. Does not remove the need
for regular response gas checks or calibration).
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Product Training Presentation XNX rev 2
XNX EC & MPD Sensor Gases and Ranges
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Product Training Presentation XNX rev 2
XNX Mechanical Data
• Materials
• Entries
- Painted Aluminium LM25
 General Industrial applications
- Painted Stainless Steel 316
- 5 x M25 (ATEX/IECEx version)
- 5 x ¾”NPT (UL/CSA versions)
- Suitable blanking plugs also
supplied
 Offshore and harsh
environments
 Food and beverage markets
 Must be suitably sealed to
maintain IP rating
• Hazardous area certified
- ATEX, IECEx, UL and cUL
Outline transmitter
dimensions:
• Mounting
- 2 x Integral mounting lugs
- Suitable for M10-12 bolts
- Optional Pipe, Ceiling or Duct
mounting options (see
following slides)
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Product Training Presentation XNX rev 2
XNX Optional Accessories
• Pipe mounting kit
- The transmitter may be fixed
-
directly to a vertical
pipe/structure
Suitable for pipes Ø50.0-100.0mm
(Ø2” to 6”).
• Ceiling mounting Bracket
- Allows XNX to be mounted to a
-
ceiling
Includes: 2 x Stainless Steel
Ceiling Mount Brackets, bolts and
nuts.
• Remote EC sensor mounting kit
- Allows the XNX EC sensors to be
-
remotely mounted via an IS cable
kit, up to 15 meters (50 feet) from
the transmitter.
Includes 15 meters of shielded
cable, cable glands and remote
terminal box.
 The cable can be cut to the
required length and terminated at
the remote terminal box
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Product Training Presentation XNX rev 2
XNX Optional Accessories
• Duct mounting kit
- Enables detection within
-
ventilation duct with transmitter
external to duct
As standard for CO, H2 and H2S
EC sensors
Separate additional MPD
sensor adaptor for flammable
and Hydrocarbon gases
Square/rectangular ducts
 Minimum 1mm (0.04”) duct wall
thickness
- External gas inlet port
 Recommended for bump test only
 Use calibration cup for calibration
 Suitable for 6mm (¼”) ID tubing
• Other sensor accessories
- A wide range of weather
protection assemblies, flow
housings, collecting cones and
calibration adaptors are
available depending on the type
of sensor used.
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Product Training Presentation XNX rev 2
XNX with MPD Sensor Mechanical Data
ALL DIMENSIONS IN mm. 1” = 25.4mm
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Product Training Presentation XNX rev 2
XNX with EC Sensor Mechanical Data
ALL DIMENSIONS IN mm. 1” = 25.4mm
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Product Training Presentation XNX rev 2
XNX with S.Point PPM Sensor Mechanical Data
ALL DIMENSIONS IN mm. 1” = 25.4mm
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Product Training Presentation XNX rev 2
XNX with Optima Plus Sensor Mechanical Data
ALL DIMENSIONS IN mm. 1” = 25.4mm
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Product Training Presentation XNX rev 2
XNX with Optima Plus Sensor Mechanical Data
Ceiling Mounting
Pipe/Pole Mounting
ALL DIMENSIONS IN mm. 1” = 25.4mm
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Product Training Presentation XNX rev 2
XNX with Searchline Excel Mechanical Data
ALL DIMENSIONS IN mm. 1” = 25.4mm
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Product Training Presentation XNX rev 2
XNX with Remote S.Point HT Sensor Mechanical Data
ALL DIMENSIONS IN mm. 1” = 25.4mm
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Product Training Presentation XNX rev 2
XNX with Remote 705HT Sensor Mechanical Data
ALL DIMENSIONS IN mm. 1” = 25.4mm
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Product Training Presentation XNX rev 2
XNX Electrical Data
• Output
- Industrial standard 4-20mA
 Sink or source switch selectable
- Over range 22mA
- Fault ≥0.0<1.0 mA
- Inhibit (Selectable)
 Flam/Toxic: 2mA or 4mA
(Oxygen 2mA or 17.4mA)
• Supply voltage
- 16 to 32Vdc (24Vdc nominal)
• Power consumption (max)
- XNX EC (Toxic) 6.2W
- XNX mV (Flam) 6.5W
- XNX IR with Optima Plus 9.7W
- XNX IR with Excel receiver
13.2W
NOTE: To avoid ground loops, terminate screen at detector or controller, not both
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Product Training Presentation XNX rev 2
XNX Electrical Data
• Wiring
- Suitable mechanically protected
-
cable/conduit and glands
3 or 4 core plus screen
 90% coverage preferred
- 0.5mm2 to 2.5mm2 (Approx. 20 to
14AWG) cable
 Ensure min required voltage at
transmitter is 18Vdc
• Maximum cable lengths
- Max. cable length between a
NOTE: To avoid ground loops, terminate screen at detector or controller, not both
controller and detector is dependent
upon:
 The minimum guaranteed supply




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voltage from the controller
The minimum operating voltage of
the detector
The maximum current draw of the
detector
The input impedance of the
controller
The resistance of the cable
- The typical maximum cable length table above is for an
-
XNX mV with an MPD catalytic sensor or an XNX EC with
an XNX EC sensor fitted.
It also assumes a single transmitter being powered from a
PSU. Refer to the manual for examples of other variants
and cable topology.
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Product Training Presentation XNX rev 2
XNX Personalities
• XNX has 3 basic personalities (configurations)
- XNX mV for all mV input sensors
 MPD, Sensepoint HT, PPM, and model 705
- XNX EC for use with the new XNX EC sensor
 IS Hot swap Toxic and Oxygen sensors
- XNX IR for use with IR open path and point detectors
 Searchline Excel and Searchpoint Optima Plus
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Product Training Presentation XNX rev 2
XNX Terminals (POD)
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Product Training Presentation XNX rev 2
XNX Terminals (POD)
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Product Training Presentation XNX rev 2
XNX Terminals (POD)
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Product Training Presentation XNX rev 2
XNX Electrical Data
EC version POD
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Product Training Presentation XNX rev 2
XNX Electrical Data
mV version POD
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Product Training Presentation XNX rev 2
XNX Electrical Data
Searchpoint Optima
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Searchline Excel
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Product Training Presentation XNX rev 2
XNX Electrical Data
IR version POD
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Product Training Presentation XNX rev 2
XNX Electrical Data
POD options boards- relay
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Product Training Presentation XNX rev 2
XNX Electrical Data
POD options boards- Modbus®
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Product Training Presentation XNX rev 2
XNX Electrical Data
POD options boards- Foundation Fieldbus™
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Product Training Presentation XNX rev 2
XNX Display and user interface
Power LED
(Green)
Alarm LED
(Red)
Fault LED
(Yellow)
Status Icon
Gas
Concentration
Escape
Gas Units
Gas Concentration
Bar-graph
Alarm set
points
Enter/Accept
Move Left
Decrement Value
• Bright powder blue backlit LCD
(auto dimming)
• Multilingual text, symbols and
icons
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Move Right
Increment Value
• Simple Magnetic switch operation
• Optional local HART® handheld
interface
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Product Training Presentation XNX rev 2
XNX General Operation
• The XNX uses magnetic
switches to enable non
intrusive operation.
• To activate a magnetic switch,
hold the factory-supplied
wand/screwdriver 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
opposite.
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Product Training Presentation XNX rev 2
XNX Passcodes
• There are two authorization levels that control access based upon the
security level of the user.
- Level 1 Routine Maintenance
- Level 2 Technician and passcode
• The passcodes for both levels are set at “0000” from the factory, and must
be reset after installation to control access.
• Once the passcode screen is displayed, the first passcode digit is
highlighted.
- Use the + or - 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 x will move to the previous digit of 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.
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Product Training Presentation XNX rev 2
XNX Main Menu
• Once the correct passcode has
been entered, XNX displays
the Main Menu.
• The Main Menu has the
following options:
Main Menu Screen
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Product Training Presentation XNX rev 2
XNX Menu Structure
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Product Training Presentation XNX rev 2
Information Menu
Icon
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Menu
Description
Alarm/Fault
Status
Displays an Alarm Reset screen allowing faults and alarms to
be reset.
Date/Time
Displays the date and time in the formats currently set on the
XNX.
Transmitter Data
Displays the ID, part number, serial number and revision level
of the XNX firmware. Also used to accept new options added.
Transmitter
Status
Displays information about the XNX unit including temperature,
4-20mA output value and supply voltage.
Sensor Data
Displays information about the XNX unit including sensor type
and sensor software revision.
Sensor Status
Displays the temperature and sensor life of the XNX EC or MPD
sensor if used.
Gas Data
Displays the detectable gas as configured for the attached
sensor.
Range/Alarm
Settings
Displays the configured alarm information.
mA Level
Settings
Displays the mA output values for Inhibit, Warning and
Overrange.
Relay Settings
Displays the settings of the optional relays on the XNX.
Fieldbus Settings
Displays the configuration of both HART® and Modbus.
Event History
Lists all alarms or faults in chronological order beginning with
the latest event.
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Product Training Presentation XNX rev 2
Test Menu
Icon
Menu
Description
Inhibit
Switches the manual inhibit alarm output function on or off.
Force mA Output
Forces a selected mA output to provide the means for testing
operation of peripheral devices connected to the mA output.
Force Relay
Forces the relay operation to provide the means for testing
operation of peripheral devices connected to the relays.
Alarm/Fault
Simulation
Allows simulation of alarm, fault or warning operation.
Calibrate Menu
Icon
46
Menu
Description
Calibration
Allows the user to perform the zero and span calibration of the
specific sensor attached to the XNX transmitter.
Bump Test
Allows bump test of attached sensor and displays current and
peak gas reading.
Calibrate mA
Output
Allows adjustment of the milliamp output to provide the
correct signal at peripheral device(s).
Soft Reset
Forces the relay operation to provide the means for testing
operation of peripheral devices connected to the relays.
Align Excel
Displays signal strength in the form of a bar graph for use
when aligning the Searchline Excel Open Path Detector.
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Product Training Presentation XNX rev 2
Configure Menu
Icon
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Menu
Description
Set Language
Select a new display language from list of : English, Italian,
Spanish, Mandarin, German, French, Russian or Portuguese
Set Date & Time
Set time and date, and date format.
Set mV sensor
Type
Set the mV sensor type from the list of available sensors
shown.
Set mA Sensor
Type
Set the mA sensor type from the list of available sensors
shown.
Gas Selection
Set the target gas to be displayed for sensors capable of
detecting multiple gases.
Range & Alarms
Adjust the full scale range of connected sensors with that
capability. Set A1 and A2 alarm points and rising/falling action.
Latching / NonLatching
Configure A1, A2 and fault alarms to Latching or Non Latching
action.
Set Units
Provides the ability to set the units of measurement displayed
on the XNX and transmitted via HART and Modbus.
mA Levels
Sets the mA output levels for inhibit, warning, overrange and
beam blocked and Low Signal for Optima Plus and Excel.
Calibration
Interval
Set a calibration interval warning. Set to ‘0’ to disable warning.
Accept New
Sensor
Use to accept new EC cells or mV sensors to load default
parameters into the XNX for calibration and sensor life. Also
used when replacing an EC cell with another for a different
target gas.
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Product Training Presentation XNX rev 2
Configure Menu
Icon
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(cont’d)
Menu
Description
Beam Block
Options
Allows the user to define the maximum period of time the
Searchline Excel infrared beam can be blocked and the
percentage of signal loss before generating a warning through
the XNX.
Path Length
Set the path length between transmitter and receiver for
optimum operation of Searchline Excel open path detector
Unit ID
Define a unique 18 character Unit ID for each XNX. This can be
broadcast over any of the supported communication options.
Relay Options
The optional XNX Alarm relays can be set to Energized or Deenergized. The factory default setting is de-energized.
Fieldbus Options
Allows configuration of the HART® address or the optional
Modbus® fieldbus address and baud rate.
Security
Used to set or reset level 1 and level 2 passcodes that control
access to the configuration menus of the XNX.
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Product Training Presentation XNX rev 2
XNX Default Configuration
• XNX is supplied
with the default
configuration
shown opposite.
• Other
configurations are
sensor type and
output option
dependent.
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Product Training Presentation XNX rev 2
XNX Commissioning/First Time Start Up
After mounting and wiring the XNX and associated sensor, the
installation should be visually and electrically tested as below:
1. Check that the transmitter is wired correctly according to this
manual and the associated control equipment manual.
2. If equipped, unscrew the weatherproof cover, loosen the sensor
retainer locking screw and unscrew the retainer.
3. For EC sensors, plug in the sensor cartridge taking care to align
the sensor pins with the connector holes in the PCB. (For toxic
sensors, remove the shorting clip from the bottom of the sensor
prior to installation. For O2 sensor, there is no shorting clip
provided).
4. Refit the sensor retainer, tighten the locking screw and refit the
weatherproof cover.
Note: Before replacing the cover on the transmitter housing, coat the threads with
anti-seize compound to prevent corrosion build-up. Also inspect the cover o-ring
for cracking or any other defect that might compromise the integrity of the seal. If it
is damaged, replace with the o-ring supplied in the accessory kit.
5. Apply power to the XNX which will in turn provide power to the
detector.
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Product Training Presentation XNX rev 2
XNX Commissioning/First Time Start Up
6. The detector output will be forced to 1mA (default fault/inhibit).
7. The XNX display will enter a start up routine displaying the
initialization screen, then the transmitter loads its operating
system, data from the sensor and checks if it is the same type
transmitter and sensor software version numbers, gas type, the
detection range and span calibration gas level, estimated time to
next calibration due, and self test result. The boot-up procedure
takes approximately 45 seconds.
8. In the final stages of boot-up, warnings and faults may be
observed until the user performs the proper configuration,
calibration, and reset activities.
9. Once the General Status screen appears, the transmitter and
detector are in normal ‘monitoring’ mode.
10. Calibration of sensors attached to the XNX is mandatory before
the detector can be used for gas monitoring.
11. For EC and mV personalities, be sure to perform ‘Accept New
Sensor Type’ before calibrating the sensor.
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Product Training Presentation XNX rev 2
Commissioning XNX and Searchline Excel
When powering the XNX fitted to the Searchline Excel, the
following procedure must be followed to assure proper
installation.
1. When the XNX completes boot-up, perform a Soft Reset on
the Excel from the Calibration Menu.
2. When the reset is complete, Set Date & Time.
3. Set the Path Length for the application, then align the
transmitter and receiver with Align Excel.
4. Once the alignment is complete, a Zero Calibration must be
performed on the Excel to complete the commissioning
process.
5. Reset any faults displayed on the XNX display. The XNX and
Excel are now ready to monitor.
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Product Training Presentation XNX rev 2
XNX Calibration- General
•
•
•
53
Each of the sensor technologies supported by the
XNX Universal Transmitter uses unique calibration
procedures.
The description provided illustrates the XNX
interface to the sensor device and does not
replace the procedures found in each device
operating manual.
The Gas Calibration menu is used for Zero and
Span calibration as well as functional gas testing
(bump test). The Gas Calibration menu is
accessed from the main menu screen.
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Product Training Presentation XNX rev 2
XNX General Zero Calibration
1. If using compressed gas cylinder, push the calibration gas
flow housing onto the bottom of the sensor and apply the
gas.
2. Access the calibration mode.
3. Apply the zero gas. As the sensor detects the gas and the
concentration is increasing, the values displayed will reflect
the changing concentration. When the concentration values
are stable select  to allow the XNX to calculate the zero
adjustment.
4. Selecting X will return to the Gas Calibration menu.
5. If the Zero Calibration is successful, the XNX Universal
Transmitter will display the Zero Passed screen.
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Product Training Presentation XNX rev 2
XNX General Span Calibration
If a Span Calibration is not required, select X to skip the
Span Calibration and return to the Calibration menu.
1. When the Zero Calibration is complete, the Span
Concentration screen appears to indicate the concentration
value of the gas used for calibration. If Span is skipped, the
user is returned to the Gas Calibration Screen.
2. Indicate the concentration of the span gas to be used by
selecting  to choose the first digit and use the + & switches to increment or decrement the values;  accepts
the new value and moves to the next digit. Continue until all
3 digits have been selected.
3. Apply the span gas. As the sensor detects the gas and the
concentration is increasing, the values displayed will reflect
the changing concentration.
4. When the concentration values are stable select  to
perform the span. The Span Calibration process also
determines whether the sensor is within the proper range to
accurately detect the target gas.
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Product Training Presentation XNX rev 2
XNX General Span Calibration
5. Selecting X will return to the Gas Calibration menu.
6. When the sensor has completed the calibration and the span
algorithms have determined that it is within range, the Span
Passed screen will appear.
7. If the calibration is not successful, the Span Failed screen
will display.
8. Selecting  will return to the Span Concentration screen to
begin the span calibration again. X will exit Span Calibration
and return to the Main Calibrate screen.
9. Once the Zero and Span calibrations are completed
successfully, the XNX will exit the calibration procedure.
Before returning to the Gas Calibration menu however, the
user will be prompted to Exit and turn alarm and fault inhibit
off, exit and leave the XNX in inhibit mode, or do not exit.
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Product Training Presentation XNX rev 2
XNX EC Sensor Calibration
Before initial calibration allow the detector to stabilize for 30
minutes after applying power.
When in zero and span calibration mode the current output
from the detector is inhibited (default 2mA) to avoid false
alarms.
It is recommended for most sticky gases (i.e.: HCl, Cl2) the
tubing should be PTFE with short pieces of rubber tube to
make the final connection due to the inflexibility of PTFE.
To calibrate the detector, use an appropriate span gas
cylinder, flow regulator set to 300-375mL/min, tubing,
magnet and calibration gas flow housing.
A compressed gas cylinder (20.9%Vol oxygen) should be
used to perform the zero calibration if the area where the
detector is located contains any residual amount of the
target gas. If no residual gas is present then the background
air can be used to perform the zero calibration.
The Oxygen sensor does not require a zeroing procedure.
Background air (20.9%Vol oxygen) can be used to span the
oxygen sensor in place of a compressed air cylinder
(20.9%Vol oxygen).
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Product Training Presentation XNX rev 2
XNX EC Sensor Calibration
Zero and Span Calibration notes for XNX EC Hydrogen
Sulphide (H2S) Sensors:
Hydrogen Sulphide sensors can be affected by extreme
humidity changes. A sudden increase in ambient humidity
can result in a short term positive drift in the instrument’s
reading. A sudden decrease in ambient humidity can result
in a short term negative drift in the instrument’s reading.
These are most likely to be noticed during calibration with
dry or cylinder gas.
To zero the sensor, use a compressed gas cylinder of
20.9%Vol oxygen (not Nitrogen). Do not use background air.
If a span calibration is to be performed, the span calibration
gas should be applied to the sensor immediately after the
zeroing procedure. Do not allow the sensor to return to
ambient air conditions.
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XNX Bump Test
It is recommended that the detector is tested frequently to
ensure the system is operating properly. The weatherproof
cover has a spigot for attaching tubing from a gas cylinder.
This may be used for a simple functional (or bump) test of
the sensor. However, this method may not be suitable for all
gas types and/or applications due to environmental
conditions. It is the responsibility of the user to ensure
suitability of this method for each application.
1. Select Bump Test from the Calibrate Menu.
2. When bump gas is applied to the sensor, the bump test
screen displays the current reading of the sensor and the
peak reading that has occurred during the bump test.
3. If the difference between reading and applied gas
concentration is outside the acceptable limits for the
application follow the procedures for zeroing and calibrating
the detector
4. If reading is still inaccurate replace the sensor.
5. Once the Bump Test is completed successfully, the XNX will
exit the Bump Test procedure. Before returning to the Gas
Calibration menu however, the user will be prompted to Exit
and turn alarm and fault inhibit off, Exit and leave the XNX in
inhibit mode, or do not exit.
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Product Training Presentation XNX rev 2
XNX Service and Maintenance
MPD Sensor Cartridge Replacement
1.
2.
3.
4.
5.
6.
7.
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Check that the label on the new sensor is the correct gas type.
Remove power from the transmitter.
Unscrew the weatherproof cover (if equipped), loosen the retainer locking
screw and unscrew the sensor retainer.
Remove the old sensor by pulling without twisting.
Slide the replacement cell into the MPD body taking care to align the tab
with the alignment slot, then press the cell firmly to seat it into the body.
Refit the sensor retainer, tighten the locking screw and refit the
weatherproof cover (if equipped).
Re-calibrate the detector
HONEYWELL - CONFIDENTIAL
Product Training Presentation XNX rev 2
XNX Service and Maintenance
XNX EC Sensor Cartridge Replacement
The serviceable EC sensor allows replacement of the cell inside the sensor. The
sensor cell can be replaced with cell of the same type or changed to detect a
different target gas. Note: When replacing Oxygen (O2) sensor cells, the initial
warm-up time is between 10 and 15 minutes. This warm-up is required only after
sensor cell replacement.
To replace the cell follow the procedure below.
1.
2.
3.
4.
5.
6.
7.
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Unscrew the weatherproof cover, loosen the
sensor retainer locking screw and unscrew
the sensor retainer.
Remove the old sensor by pulling without
twisting.
Unscrew the sensor cap.
Remove the old cell by pulling without
twisting.
Ensure the new cell is the same type as the
old cell.
Plug the new cell into the sensor, taking care
to align the sensor pins with the connector
holes in the PCB.
Refit the sensor retainer, tighten the locking
screw and refit the weatherproof cover.
HONEYWELL - CONFIDENTIAL
Product Training Presentation XNX rev 2
XNX Service and Maintenance
8.
9.
10.
11.
12.
13.
14.
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Sensor warm-up will begin and the XNX display will alternate between two
screens Fault 151 and ‘WARM’.
Note: If a different gas type cell is fitted, a message such as ‘G:TBV:O2’.
‘TBV’ is also displayed.
The ‘O2’ will reflect the gas type of the new cell.
Select the ‘Accept New Sensor Type’ in the ‘Configure Menu’.
When changing the target gas by inserting a new sensor, cartridge the XNX
will prompt the user for a confirmation of the change before adjusting to the
properties of the new sensor.
The display of the XNX will show the old sensor cartridge type as well as
the new sensor cartridge type and requires the user to approve  or reject
X the new sensor cartridge.
Re-Calibrate the detector.
HONEYWELL - CONFIDENTIAL
Product Training Presentation XNX rev 2
XNX Warning Codes
• XNX has a comprehensive list of Warning and Fault
codes. Refer to the manual for addition information
codes
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XNX Warning Codes
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XNX Warning Codes
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XNX Fault Codes
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XNX Fault Codes
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XNX Fault Codes
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XNX Fault Codes
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XNX Fault Codes
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XNX Fault Codes
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XNX Fault Codes
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Product Training Presentation XNX rev 2
HART® Interface
• Every XNX gas detector can communicate using the HART® protocol. The
HART® protocol is defined by the HART Communication Foundation at
http://www.hartcomm.org. HART® is unique among fieldbuses in that the
digital signal is superimposed on top of a traditional 4-20 mA current loop.
This provides the solid reliability of analog signaling with the advanced
diagnostic capability of a digital device.
• HART® devices are usually connected as point-to-point networks.
Additionally, the analog output of the XNX can be disabled to facilitate
construction of multidrop all-digital HART® networks.
HART® Point to Point Mode
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HART® Multi Point Mode
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Product Training Presentation XNX rev 2
HART® Interface
• If HART® is not needed the XNX may simply be used as a 4-20 mA transmitter.
Since the XNX is a slave, the internal modem will remain silent if no master
signal is present. Additionally the HART® signal is at too high of a frequency
(1200 Hz) to interfere with analog control equipment.
• Another novel feature of HART® networks is that two masters may be present.
The primary master is generally a distributed control system (DCS),
programmable logic controller (PLC), or a personal computer (PC). The
secondary master can be a handheld terminal. The XNX has been tested with
the handheld Emerson 375 Field Communicator.
• The XNX device descriptor (DD) file provides HART® masters with data on the
capabilities and features of the XNX gas detector. HART® terminals thus have
a friendly, intuitive interface when connected to the XNX. At press time, the
XNX DD file was not yet available on the HART® Foundation website. A copy of
the file is included on the Documentation CD. This DD file may be installed in
an Emerson 375 Field Communicator using the 375 Easy Update Programming
Utility.
• During manufacturing, Honeywell configures the 8-digit HART® tag to the XNX
serial number. This may be used to confirm correct wiring from the XNX to the
control system. The HART® tag may be modified if desired. The fixed XNX
serial number can also read over HART®.
• For convenience, the XNX presents the HART® signal on two interfaces. The
1200 Hz AC signal is capacitively coupled to the main 20 mA analog output.
This may be monitored at the control system or at any point along the 20 mA
loop. Additionally, the optional local HART® interface (P/N XNX-HIF) permits
temporary connection of a HART® terminal to the XNX. This local HART® port
is transformer-coupled to the main 20 mA output. This port is intrinsically safe
and polarity insensitive.
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Product Training Presentation XNX rev 2
HART® Interface
• The internal HART® modem functions as a high-impedance current
source. Thus transferring the HART® signal requires a certain
minimum loop resistance between the slave and a low-impedance
power supply.
• Normally, this resistance is supplied by the control system and so
need not be explicitly added. However, special treatment is needed
when the mA output is not used and the local HART® interface is
needed (an installer might choose to communicate using relays,
Modbus, or Foundation Fieldbus instead.) In this case the supplied
510 Ohm resistor must be fitted to create an ‘artificial’ mA loop. The
resistor should be connected between TB-1 terminal 1-3 and terminal
1-6. Additionally, S1 and S2 should be placed in ‘source’
configuration. This is shown in the following wiring schematic.
• The digital HART® interface provides all of the capabilities of the local
user interface. The XNX has been designed to use the portable
Emerson 375 Field Communicator and with DevCom2000 software for
Microsoft Windows® and Emerson AMS Intellegent Device Manager.
Using HART®, a service person can display information, test,
calibrate, and configure.
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Product Training Presentation XNX rev 2
HART® Sink, Source and Isolated Wiring
XNX Multidrop HART Network Wiring - XNX Sink
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HART® Sink, Source and Isolated Wiring
XNX Multidrop HART Network Wiring - XNX source
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HART® Sink, Source and Isolated Wiring
XNX Multidrop HART Network Wiring - XNX isolated
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Product Training Presentation XNX rev 2
DevComm PC-Based HART® Interface
• The XNX HART® interface facilitates remote access to all features of the local
user interface including displaying status, testing, calibrating and configuring.
A device descriptor (DD) file is available to adapt standard tools for use with
the XNX. The screens below show some of the features of these two interfaces
for the XNX.
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HART® Configuration Summary
• It is simple to extract all of the HART® status information from the XNX as a
PDF or text file. This includes voltages, signal strengths and configuration
settings. An example summary is shown below.
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HART® Information Screens
• All of the information in the above Configuration Summary can be viewed live
on various informational displays. For example, alarm settings are shown
below.
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HART® Event History
• The XNX maintains a record of all significant events. All alarms, all warnings
and all faults are recorded. Additionally, over 60 types of informational events
are defined to record important transactions such as recalibrations or
configuration changes. Every event has a timestamp and one thousand
records are maintained.
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HART® Test Menu
• The test menu provides methods for inhibiting the output, exercising the
analogue output or simulating alarms or faults. These methods ease common
tasks by providing a simple user interface.
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HART® Calibration Menu
• The calibration menu permits calibrating zero or span and bump testing.
Additionally, when fitted with a Searchline EXCEL gas detector, the Calibrate
menu displays the optical signal strength for mechanical alignment. The gas
calibrate operation is shown below.
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Product Training Presentation XNX rev 2
XNX Configuration over HART®
• All user settings of the XNX can be made either at the local user interface or
over HART. The configuration menu facilitates convenient setup of alarm
levels as shown. Methods are also provided to set time, units and other
parameters.
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Product Training Presentation XNX rev 2
HART® Handheld Online Menu
• When HART® communication is established with the XNX, the first menu
displayed is the Root menu:
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HART® Handheld Online Menu
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HART® Handheld Online Menu
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HART® Handheld Online Menu
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HART® Handheld Online Menu
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Modbus® Protocol
• The XNX gas detector may be fitted with the optional Modbus
interface card (P/N XNX-MB). Authoritative information on the Modbus
protocol can be found at www.modbus.org. The XNX supports
Modbus/RTU over an RS-485 physical layer. The interface is isolated
and includes a switchable 120 Ohm termination resistor. Baud rates
from 1200 to 38,400 are supported with 19,200 as the default.
• Most of the operations that are possible with the HART and local user
interfaces can also be performed using the Modbus interface. This
includes test, calibration and configuration operations. However, this
Appendix only describes how to monitor XNX status using Modbus.
Information on more advanced operations is contained in technical
publication 1998-0746.
• Some of the relevant Modbus holding registers are listed in the table
following. Monitoring the XNX status is simpler than it looks – most
installations will read only the first five registers. (This is four data.)
Note that the assignment of first eight registers (or six data) is
identical to the Honeywell Analytics XCD gas detector.
• Building an effective Modbus automatic gas detection system
requires checking for faults (using iFaultWarnNumber or iAlmFltLev)
and checking iMonitoringState to confirm that the XNX is not inhibited
or in calibration.
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Modbus® Registers
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Modbus® Registers
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Modbus® Registers
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