Safety Guide
XNX Universal Transmitter
Fault Diagnostic Time Interval 7
Interval of Proof Testing
Component SIL Level*
Safety
Architecture
PFDavg** PFH (1/h) SFF % DC % Test Report
XNX Universal Transmitter with Infrared Combustible Gas Detector
(with Searchpoint Optima Plus)
SIL2 1oo1 4.8E-04 1.1E-07 95.9 >81%
TUV 968/EZ 319.05/15
TUV 968/EZ 559.00/12
λ (t) λ
Du (t) λDd (t) λD (t) SC PTC %
5375 220 2265 2486 2 100
Component SIL Level*
Safety
Architecture
PFDavg** PFH (1/h) SFF % DC % Test Report
XNX Universal Transmitter with Infrared Combustible Gas Detector
(with Searchline Excel)
SIL2 1oo1 7.7E-04 1.8E-07 95 --
TUV 968/EZ 319.05/15
Exida 04/08-13 R001
λ (t) λ
Du (t) λDd (t) λD (t) SC PTC %
5445 269 2005 2275 2 100
Component SIL Level*
Safety
Architecture
PFDavg** PFH (1/h) SFF % DC % Test Report
XNX Universal Transmitter Standalone XNX Transmitter (main board)
SIL2 1oo1 1.2E-04 2.8E-08 98.2 >90%
TUV 968/EZ 319.05/15λ (t) λ
Du (t) λDd (t) λD (t) SC PTC %
3155 55.6 633 689 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
If the XNX is used in high demand systems, a proof test is not required.
If the XNX is used in low demand systems (defined as 1 demand or
less per year) a proof test is required. 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.