Honeywell XNX Universal Transmitter User Manual
- June 10, 2024
- Honeywell
Table of Contents
Honeywell XNX Universal Transmitter
XNXTM Universal Transmitter
The XNXTM Universal Transmitter is a gas detector transmitter that is capable of detecting toxic gases. It comes with an ECC sensor that is SIL approved only if used with the XNX transmitter. The XNX system is considered to be functionally safe as it can detect the majority of safe and unsafe failures.
Safety Parameters
The XNX Universal Transmitter is IEC 61508 certified for safety. The safety integrity level of the system is outlined in Table 1 and Table 2. The XNX system is Type B, and it uses controllers or programmable logic per IEC 61508.
Usage Instructions
Before using the XNXTM Universal Transmitter, please ensure that you have read and understood the safety manual provided with the product. Follow the steps below to use the product:
- Install the XNX Universal Transmitter in the desired location.
- Connect the sensor to the main board and personality board of the transmitter.
- Ensure that the ECC sensor is only used with the XNX transmitter.
- Configure the XNX Universal Transmitter according to your requirements.
- Test the XNX Universal Transmitter to ensure that it is functioning correctly.
- Monitor the XNX Universal Transmitter regularly to ensure that it continues to function correctly.
Failure to follow the above instructions may result in malfunctioning of the product, which can be dangerous. If you have any questions or concerns about using the XNXTM Universal Transmitter, please consult the manufacturer or a qualified expert.
SIL 2 Certificate
XNX Gas Detector Transmitter
XNX ECC Sensor (Toxic gases)
- ECC sensor is SIL approved only if used with XNX transmitter
Overview
IEC 61508 is a generic functional safety standard. Functional safety is
defined 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/PES1 safety 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 defined as a failure with a definite 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-certified 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 Table 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| ³ 10-5 to < 10-4
3| ³ 10-4 to < 10-3
2| ³ 10-3 to < 10-2
1| ³ 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| ³ 10-9 to < 10-8
3| ³ 10-8 to < 10-7
2| ³ 10-7 to < 10-6
1| ³ 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.
Note: Only one personality board per XNX main 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.
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 319.07/20
λ (fit)| λDu (fit)| λDd (fit)| λD (fit)| 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 319.07/20
λ (fit)| λDu (fit)| λDd (fit)| λD (fit)| 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 (fit)| λDu (fit)| λDd (fit)| λD (fit)| 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 (fit)| λDu (fit)| λDd (fit)| λD (fit)| 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 Standalone XNX Transmitter (main board)
| SIL2| 1oo1| 1.71E-03| 95.54| >90%| |
TUV 968/EZ 319.07/20
λ (fit)| λDu (fit)| λDd (fit)| λD (fit)| 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.
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.
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.
Proof Test
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.
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)
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.
Proof Testing Procedure
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.
Force mA Output
-
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.
-
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. -
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 -
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.
-
Repeat steps #2-4 to check the output of 20.0 mA.
Zero Gas mA Output
The procedure for zero gas is not applicable to the ECC O2 sensor.
- Apply zero gas to the sensor.
- 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.
Calibration Gas mA Output
- Apply calibration gas to the sensor.
- 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.
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.
Calibrate 4.0 mA and 20.0 mA
-
From the Main Menu, select the Test Menu .
-
Then select Force mA output .
-
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 -
Once the new value is entered, use the move to the ✓ and select ✓ to set the mA output.
If the 20.0 mA output was not equal to 20.0 mA, complete steps #3-4.
Zero Gas Calibration and Span Calibration
The following section outlines the steps for calibrating the attached XNX
sensors. For calibration information for specific sensors, refer to the XNX
Technical Manual.
- If using a compressed gas cylinder, push the calibration gas flow housing onto the bottom of the sensor and apply the gas.
- Access the Calibration Menu.
Figure 3. Gas Calibration Menu
NOTE:
The Gas Calibration Menu is for both Zero Gas and Span Gas Calibration.
Zero Gas Calibration
Figure 4. Zero Gas Calibration Screen
As the sensor detects the zero gas and the concentration increases, the values displayed will reflect 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
- If the Zero Gas Calibration is successful, the Zero Passed screen displays.
Figure 6. Zero Gas Calibration Passed
NOTE:
If a Span Calibration is not required, select ✖ to skip the Span
Calibration and return to the Calibration Menu.
-
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 -
Enter the concentration of the span gas by selecting ✓ to choose the first 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.
Figure 8. Span Calibration Screen -
Apply the span gas. As the sensor detects the gas and the concentration increases, the values displayed will reflect 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 proper range to accurately detect the target gas.
Selecting ✖ will cancel the span calibration and return to the Gas Calibration Menu. -
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. 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.
Verifying mA Settings
The mA levels output for inhibiting alarms during maintenance/testing,
warnings triggered by the XNX, over range conditions, Beam Blocked and Low
Signal for the Search point Optima Plus and Searchline Excel gas detectors
must be verified.
- From the Main Menu, select the Configure Menu . From the Configure Menu, select mA Levels.
Figure 12. mA Levels Menu
-
Use the switches to move to the mA output to be changed and use ✓ to select it.
Figure 13. Set mA Levels for Warning -
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. -
Using the switches, increment or decrement the value until the desired value appears. Then use ✓ to confirm 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 over range condition, the range is 20.0 to 22.0 mA. Refer to Section 5 Warnings/Faults in the XNX Technical Manual for more information. -
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 is not selected, none of the changes will be saved.
Testing
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.
-
From the Test Menu, select Alarm/Fault Simulation.
Figure 15. Alarm/Fault Simulation Screen -
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
-
Selecting an alarm level to simulate will activate a confirmation screen.
Figure 17. Confirmation
Selecting ✓ will simulate the selected alarm. If the ✖ is selected, the
simulation is aborted.
- To simulate a Warning or Fault from the XNX, select the appropriate icon from the menu. Figure 18. Warning and Fault Simulation Screens
- As in an alarm simulation, a confirmation screen will appear. Selecting ✓ will simulate a warning or fault from the XNX. If ✖ is selected, the simulation is aborted. Figure 19. Fault Simulation Confirmation
- 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 confirmation 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.
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.
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.
1998-0808
Revision 6 Nov 2021
© 2021 Honeywell Analytics
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References
- Honeywell - The Future Is What We Make It
- Honeywell Analytics
- Safety and Productivity Solutions | Honeywell
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