Honeywell XNX Guida utente

XNX

UNIVERSAL TRANSMITTER

SAFETY

MANUAL

XNX™

Universal Transmitter

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XNX Universal Transmitter

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

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

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

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