Honeywell XNX User guide

XNX
UNIVERSAL TRANSMITTER
SAFETY
MANUAL
XNX™
Universal Transmitter

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XNX Universal Transmitter
3
Table of Contents
1 SIL 2 Certificate ........................................................................................................................................................................................... 3
1.1 XNX Gas Detector Transmitter........................................................................................................................................................... 3
2 Overview ...................................................................................................................................................................................................... 4
3 Safety Parameters....................................................................................................................................................................................... 5
3.1 Interval of Proof Testing ..................................................................................................................................................................... 6
4 Fault Diagnostic Time Interval .................................................................................................................................................................... 6
5 Proof Test..................................................................................................................................................................................................... 7
5.1 Purpose of Proof Testing.................................................................................................................................................................... 7
5.2 Expected Outcome of Proof Testing ................................................................................................................................................. 7
5.3 Tolerance of Output Current Levels................................................................................................................................................... 7
6 Proof Testing Procedure ............................................................................................................................................................................. 7
6.1 Checking ............................................................................................................................................................................................. 7
6.1.1 Force mA Output ....................................................................................................................................................................... 7
6.1.2 Zero Gas mA Output.................................................................................................................................................................. 8
6.1.3 Calibration Gas mA Output ....................................................................................................................................................... 8
6.2 Adjusting ............................................................................................................................................................................................. 8
6.2.1 Calibrate 4.0 mA and 20.0 mA .................................................................................................................................................. 8
6.2.2 Zero Gas Calibration and Span Calibration.............................................................................................................................. 8
6.2.2.1 Zero Gas Calibration...............................................................................................................................................................9
6.2.2.2 Span Calibration ..................................................................................................................................................................... 9
6.3 Verifying mA Settings ....................................................................................................................................................................... 10
6.4 Testing............................................................................................................................................................................................... 11
6.4.1 Fault and Alarm State.............................................................................................................................................................. 11
6.4.2 Gas Verification........................................................................................................................................................................ 12

XNX Universal Transmitter
SIL 2 Certicate 4XNX Gas Detector Transmitter
1 SIL 2 Certificate
1.1 XNX Gas Detector Transmitter
1.2 XNX ECC Sensor (Toxic gases)
* ECC sensor is SIL approved only if used with XNX transmitter

XNX Universal Transmitter
Overview 5XNX Gas Detector Transmitter
2 Overview
IEC 61508 is a generic functional safety standard. Functional safety
is dened in this standard as “part of the overall safety relating to
the Equipment Under Control (EUC) and the EUC control system
which depends on the correct functioning of the E/E/PES1safety
related systems, other technology safety-related systems, and
external risk reduction facilities.”
A system is considered to be functionally safe if the random and
systematic faults do not kill or injure humans, pollute the environment,
and do not result in the loss of equipment or production.
A systematic fault is dened as a failure with a denite cause. A
random fault can happen at any time and the cause is unclear. The
terms fault and failure can be used interchangeably.
A Safety Integrity Level-certied system can detect the majority of
safe and unsafe failures. XNX is SIL 2 capable per IEC 61508. XNX
is SIL 3 capable in a redundant system per IEC 61508. Table 1 and
Tabl e 2 below outline a system’s safety integrity level in relation to
its average probability of failure to perform its design function on
demand and probability of dangerous failure per hour.
Table 1. Average Probability of Failure to Perform Its Design Function on Demand (Low Demand
System)
Safety Integrity
Level
Low demand mode of operation (Average probability of
failure to perform its design function on demand (PFD))
4≥10-5 to < 10-4
3≥10-4 to < 10-3
2≥10-3 to < 10-2
1≥10-2 to < 10-1
Table 2. Probability of a Dangerous Failure Per Hour (High Demand System)
Safety Integrity
Level
High demand or continuous mode of operation
(Probability of a dangerous failure per hour (PFH))
4≥10-9 to < 10-8
3≥10-8 to < 10-7
2≥10-7 to < 10-6
1≥10-6 to < 10-5
NOTE:
The XNX system is Type B. A Type B system uses controllers
or programmable logic per IEC 61508.
The XNX product consists of a main board, a personality board,
and a sensor.
XNX
main
board
IR Personality
board
EC Personality
board
IR sensor
mV sensor
EC sensor
XNX Transmitter Sensor
Note: Only one personality board per XNX main board
mV Personality
board
This manual outlines the proof test procedure, a required operation
to maintain the XNX’s functional safety under low demand
applications.
In XNX output signals, only 4-20 mA is considered a safety function.
Other output signals are optional signals and are not part of the
SIL2 compliance.

XNX Universal Transmitter
Safety Parameters 6XNX Gas Detector Transmitter
3 Safety Parameters
The safety parameters listed below are a combination of the main board, personality board, and sensor. These numbers were
provided by TUV in report 968/EZ 319.07/20. For safety parameters of the individual sensors, refer to the XNX Safety Parameters For
Sensors white paper.
Component SIL Level* Safety
Architecture PFDavg** SFF % DC % Test Report
XNX Universal Transmitter with Combustible Sensor (IR board)
SIL2 1oo1 2.06E-03 >90% >90%
TUV 968/EZ 319.07/20λ (t) λDu (t) λDd (t) λD (t) SC PTC %
14768.96 447.14 6956.00 7433.14 2 100
Component SIL Level* Safety
Architecture PFDavg** SFF % DC % Test Report
XNX Universal Transmitter with Combustible Sensor (mv Catalytic bead)
Sensepoint and Sensepoint HT detector
SIL2 1oo1 2.13E-03 >90% >90%
TUV 968/EZ 319.07/20λ (t) λDu (t) λDd (t) λD (t) SC PTC %
18033.53 493.46 8571.96 9064.43 2 100
Component SIL Level* Safety
Architecture PFDavg** SFF % DC % Test Report
XNX Universal Transmitter with Toxic Sensor
SIL2 1oo1 2.42E-03 >90% >90% TUV 968/EZ 319.07/20
TUV 968/EZ 493.02/19
λ (t) λDu (t) λDd (t) λD (t) SC PTC %
19119.01 559.55 9099.54 9659.09 2 100
Component SIL Level* Safety
Architecture PFDavg** SFF % DC % Test Report
XNX Universal Transmitter with Oxygen Sensor
SIL2 1oo1 2.42E-03 >90% >90% TUV 968/EZ 319.07/20
TUV 968/EZ 493.02/19
λ (t) λDu (t) λDd (t) λD (t) SC PTC %
19119.01 559.55 9099.54 9659.09 2 100
continued...

XNX Universal Transmitter
Fault Diagnostic Time Interval 7Interval of Proof Testing
Component SIL Level* Safety
Architecture PFDavg** SFF % DC % Test Report
XNX Universal Transmitter Standalone XNX Transmitter (main board)
SIL2 1oo1 1.71E-03 95.54 >90%
TUV 968/EZ 319.07/20λ (t) λDu (t) λDd (t) λD (t) SC PTC %
9283.11 395.99 4294.22 4690.21 2 100
*This rating is highest achievable SIL level the XNX, Searchpoint Optima Plus gas detection system can achieve as standalone safety devices. In more complex safety system the above values are the safety parameters of XNX and
Optima gas detection system required to determine the acceptance of the complete safety function (i.e., all safety parameters, safety architecture, etc.) as required by IEC 61508 and IEC 61511.
**Denotes a proof test interval of one year.
3.1 Interval of Proof Testing
1-year interval proof test is required for XNX SIL compliance.
Perform the proof test once a year to comply with IEC 61508.
Section 6 Proof Testing Procedure outlines the actions that must
be completed for a proof test.
4 Fault Diagnostic Time Interval
XNX conducts approximately 30 diagnostics total on the main
board and personality board. These diagnostics occur at different
time intervals, with the longest interval at 24 hours. But when a
fault is detected, it is reported within 3 seconds. Refer to the XNX
Technical Manual for more information on diagnostics.

XNX Universal Transmitter
Proof Test 8Purpose of Proof Testing
5 Proof Test
5.1 Purpose of Proof Testing
A proof test is a periodic test to detect failures in the system so that,
if necessary, the system can be restored to an “as new” condition
or as close as practical to this condition.
5.2 Expected Outcome of Proof Testing
The following features are checked and adjusted if required
• current output at different levels (4.0 mA and 20.0 mA)
• verifying zero gas and span gas calibration current output
• verifying current output of warnings and faults
• simulating warnings and faults
• validation of the current output of zero gas and/or span gas
calibration (required if the current output of zero gas and/or
span gas calibration had to be changed)
5.3 Tolerance of Output Current Levels
The tolerance for the output current levels is ± 0.1 mA.
Example: If the procedure requires the current output to be 4.0
mA, the actual current reading at the controller end can range from
3.9 mA to 4.1 mA.
6 Proof Testing Procedure
6.1 Checking
The purpose of checking is to ensure the mA output meets the
expected levels. If the current does not meet the expected levels,
it will have to be adjusted. If, after completing 6 .1.1, 6 .1. 2 , and 6 .1.3,
the mA output does meet the expected levels, proceed to 6.3.
6.1.1 Force mA Output
1. Ensure the current can be measured at the controller end.
The current will be measured using the procedures outlined
in 6.1.1 to 6 .1. 3 .
2. From the Main Menu, select the Test Menu ( ).
CAUTION
The mA output set in this menu will revert to the normal operating
values when exiting the Test Menu. For more information on setting
the mA output levels for normal operation, see mA Levels in the XNX
Technical Manual.
3. From the Test Menu, select Force mA Output ( ).
The New mA Output screen shows the existing mA output in
the left column. The user can adjust the output by changing
the value in the column on the right.
Figure 1. New mA Output Screen
4. Ensure the current at the controller end is 4.0 mA. If the
current is not 4.0 mA, refer to 6. 2 .1 to adjust the output.
5. Repeat steps #2-4 to check the output of 20.0 mA.

XNX Universal Transmitter
Proof Testing Procedure 9Adjusting
6.1.2 Zero Gas mA Output
The procedure for zero gas is not applicable to the ECC O2sensor.
1. Apply zero gas to the sensor.
2. The current at the controller end should be 4.0 mA.
If the mA output is not at the expected level when applying
zero gas, perform a Zero Gas Calibration. Refer to 6.2.2 and
complete the procedure for a Zero Gas Calibration.
6.1.3 Calibration Gas mA Output
1. Apply calibration gas to the sensor.
2. The current measured at the controller end is related to the
percentage of gas applied.
Example: 100% of full gas concentration is equivalent to
20.0 mA. If 75% of the full scale gas concentration is applied,
the mA output should be 16.0 mA.
If the mA output is not at the expected level when applying
calibration gas, refer to 6.2.2 and perform a Zero Gas
Calibration and a Span Gas Calibration.
6.2 Adjusting
Perform the following procedures if 4.0 mA and 20.0 mA were
not measured at the controller end. If the correct currents were
measured, proceed to 6.3.
The current must be measured at the controller end in 6. 2 .1 and
6.2.2.
6.2.1 Calibrate 4.0 mA and 20.0 mA
1. From the Main Menu, select the Test Menu ( ).
2. Then select Force mA output ( ).
3. Adjust the current output in the column on the right until the
current at the controller end is 4.0 mA.
Figure 2. Adjusting Current
4. Once the new value is entered, use the switches to
move to the ‘3’ and select ✓to set the mA output.
If the 20.0 mA output was not equal to 20.0 mA, complete steps
#3-4.
6.2.2 Zero Gas Calibration and Span Calibration
The following section outlines the steps for calibrating the attached
XNX sensors. For calibration information for specic sensors, refer
to the XNX Technical Manual.
1. If using a compressed gas cylinder, push the calibration gas
ow housing onto the bottom of the sensor and apply the gas.
2. Access the Calibration Menu.
Figure 3. Gas Calibration Menu
NOTE:
The Gas Calibration Menu is for both Zero Gas and Span Gas
Calibration.

XNX Universal Transmitter
Proof Testing Procedure 10 Adjusting
6.2.2.1 Zero Gas Calibration
Sensor Reading
at Current Setting
s
Figure 4. Zero Gas Calibration Screen
As the sensor detects the zero gas and the concentration
increases, the values displayed will reect the changing
concentration. When the concentration values are stable
select ✓to allow the XNX to calculate the zero adjustment.
Selecting ✖will return to the Gas Calibration Menu.
Figure 5. Zero Gas Calibration in Progress
3. If the Zero Gas Calibration is successful, the Zero Passed
screen displays.
Figure 6. Zero Gas Calibration Passed
6.2.2.2 Span Calibration
NOTE:
If a Span Calibration is not required, select ✖to skip the Span
Calibration and return to the Calibration Menu.
1. When the Zero Gas Calibration is complete, the Span
Concentration screen appears. The gas concentration for
the Span Gas Calibration can be changed.
If the Span Calibration is skipped, the Gas Calibration screen
displays.
Figure 7. Span Gas Concentration Screen
2. Enter the concentration of the span gas by selecting ✓to
choose the rst digit and use the switches to increment
or decrement the values. Use ✓to accept the new value
and move to the next digit. Continue until all digits have
been selected.
Sensor Reading
at Current Setting
s
Calibration Gas
Concentration
Figure 8. Span Calibration Screen
3. Apply the span gas. As the sensor detects the gas and the
concentration increases, the values displayed will reect the
changing concentration. When the concentration values are
stable select ✓to perform the span. The Span Calibration
process also determines whether the sensor is within the

XNX Universal Transmitter
Proof Testing Procedure 11 Verifying mA Settings
proper range to accurately detect the target gas.
Selecting ✖will cancel the span calibration and return to
the Gas Calibration Menu.
4. When the sensor has completed the calibration and the span
algorithms have determined that it is within range, the Span
Passed screen will appear.
Figure 9. Span Passed Screen
If the calibration is not successful, the Span Failed screen will
display. Selecting ✓will return to the Span Concentration screen
to begin the span calibration again. Selecting ✖will exit Span
Calibration and return to the Gas Calibration Menu.
Arrow indicates
gas values too low
Selecting ‘✔’ returns to
the Span Concentration
screen
Figure 10. Span Calibration Failed
Once the Zero Gas and Span Gas calibrations are completed
successfully, the user will be prompted to
• exit with inhibit off,
• exit with inhibit on, or
• not exit.
Figure 11. Exiting Zero Gas and Span Gas calibrations
WARNING
While XNX is in Inhibit Mode, alarms are silenced. This will prevent
an actual gas event from being reported. Inhibit Mode must be reset
after testing or maintenance activities.
6.3 Verifying mA Settings
The mA levels output for inhibiting alarms during maintenance/
testing, warnings triggered by the XNX, overrange conditions,
Beam Blocked and Low Signal for the Searchpoint Optima Plus
and Searchline Excel gas detectors must be veried.
1. From the Main Menu, select the Congure Menu ( ). From
the Congure Menu, select mA Levels.
Figure 12. mA Levels Menu
2. Use the switches to move to the mA output to be
changed and use ✓to select it.
✓
Figure 13. Set mA Levels for Warning

XNX Universal Transmitter
Proof Testing Procedure 12 Testing
3. Refer to Table 6 for the mA levels. If the values do not
match the values in the table, proceed to step #4 to adjust
the values.
NOTE
If the values for the faults and warnings have been changed
from the default settings since installation, ensure the current
output matches those changed values.
Table 3. Set mA Levels
Signal* Output (mA)
Default Min Max
I Inhibit 2.0 mA 1.0 3.5
W Warning 3.0 mA 1.0 3.5
O Overrange 21.0 mA 20 22
B** Beam Blocked 1.0 mA 1.0 4.0
L** Low Signal 1.0 mA 1.0 4.0
*Faults are set to 1 mA and are not user-selectable
**Beam blocked and Low Signal apply only to Excel sensors.
4. Using the switches, increment or decrement the value
until the desired value appears. Then use ✓ to conrm the
value and move to the next setting. Repeat for each setting
that must be changed.
The available output range for Inhibit, Warning, Beam Blocked and
Low Signal is from 1.0 to 4.0 mA and for an overrange condition,
the range is 20.0 to 22.0 mA. Refer to Section 5 Warnings/Faults
in the XNX Technical Manual for more information.
5. Once all changes have been made, use the switches
to move to the ‘3’ and use ✓on the front panel to save the
settings.
Figure 14. mA Settings Saved
NOTE:
If ‘3’ is not selected, none of the changes will be saved.
6.4 Testing
6.4.1 Fault and Alarm State
The mA output of the faults and alarm states should be simulated
and the current output at the controller end should be within
tolerance. Refer to Table 6 for the current values for the fault and
alarm states.
1. From the Test Menu, select Alarm/Fault Simulation.
Figure 15. Alarm/Fault Simulation Screen
2. Figure 16 shows the menu choices simulating Alarm 1, Alarm
2, Warning, or a Fault. Selecting the return arrow icon will
display the Alarms/Fault Reset Menu.
Figure 16. Alarm/Fault Simulation Menu
3. Selecting an alarm level to simulate will activate a

XNX Universal Transmitter
Proof Testing Procedure 13 Testing
conrmation screen.
Figure 17. Conrmation
Selecting ✓will simulate the selected alarm. If the ✖is
selected, the simulation is aborted.
4. To simulate a Warning or Fault from the XNX, select the
appropriate icon from the menu.
Figure 18. Warning and Fault Simulation Screens
5. As in an alarm simulation, a conrmation screen will appear.
Selecting ✓will simulate a warning or fault from the XNX. If
✖is selected, the simulation is aborted.
Figure 19. Fault Simulation Conrmation
6. Use Alarm/Fault Reset to reset alarms, faults or warnings
generated by the simulation.
Figure 20. Alarm/Fault Reset Screen
As in an alarm simulation, a conrmation screen will appear.
Figure 21. Alarm/Fault Reset Screen
Selecting ✓will reset all alarms, faults or warnings generated
by the simulation. If ✖is selected, the simulation continues.
CAUTION
The alarms and faults generated by the simulation will not be
cleared from the XNX until alarms/faults are reset. Failure to reset
the alarms/faults upon exiting the simulation keeps the relays and
LEDs in alarm/fault mode.
6.4.2 Gas Verification
To verify the mA output of Zero Gas and Calibration, refer to 6.1. 2
and 6.1. 3.
A different bottle of calibration gas and/or zero gas should be used
to verify the results.

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1998-0808
Revision 6 Nov 2021
© 2021 Honeywell Analytics
Please Note:
While every effort has been made to ensure accuracy
in this publication, no responsibility can be accepted
for errors or omissions. Data may change, as well
as legislation, and you are strongly advised to obtain
copies of the most recently issued regulations,
standards and guidelines. This publication is not
intended to form the basis of a contract.
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