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Searchline Excel Plus & Edge™ – Safety Manual
1.3 Definitions
Check Noun: An examination to test or ascertain accuracy, quality, or satisfactory condition when compared to
a known or stated value
Verb: Examine something in order to determine its accuracy, quality, or condition when compared to
a known or stated value, or to detect the absence or presence of something
Examine
Inspect something thoroughly in order to determine its nature or condition
Inspect 1: Look at something closely, typically to assess its condition or to discover any shortcomings
2: Examine something to ensure that it reaches an official standard
Test Noun: A procedure intended to establish the quality, performance, or reliability of something, especially
before it is taken into widespread use
Verb: Take measures to check the quality, performance, or reliability of something, especially before putting
it into widespread use or practice
2 Searchline Excel Plus & Edge Safety Function
The intended use of the Searchline Excel Plus & Edge is to alert users to the presence of a potentially dangerous gaseous
leaks in a defined zone.
To achieve this aim, Searchline Excel Plus & Edge provides a safety function with two outputs which may be used
simultaneously if required, providing compatibility with different safety integrity levels.
A mA output is provided which is compatible with SIL 2 needs. Any output below 3.6 mA must be treated as a fault condition
and is a defined safe state for this safety function. A range below 4 mA can be configured to provide warning indications.
Values above 4 mA up to 22 mA can be configured to provide either an analogue representation of the leak level or a fixed
alarm output.
A set of relay output are also provided which are compatible with SIL 1 needs. Independent Fault, Suspected Alarm and
Confirmed Alarm relay contacts are provided. A de-energised fault relay must be treated as a fault condition and is a defined
safe state for this safety function. The Alarm relay contacts can be configured as either normally energised or normally
de-energised dependant on the application needs.
Compliance to IEC 61508:2010 has been assessed by an independent third party and reference to their certification and
test report can be found in the following sections.
Bluetooth, Modbus or HART communications are specifically not a part of the Searchline Excel Plus & Edge safety
function. These interfaces are non-interfering functions typically used for device setup, commissioning, diagnostics and
troubleshooting. They do not interrupt the safety critical functions of the device.
3 Searchline Excel Plus & Edge Safety Parameters
The following safety parameters are in alignment with the TÜV report HP94655C. They are valid for Modification State 1
and firmware version 6.46 of the Searchline Excel Plus & Edge.
Configuration PFD PFH SFF
Diagnostic
Coverage
ß ß
D
D
D
D
U
Safe
mA Output (SIL 2) 4.73
04
1.0
07
98% 96% 5% 2% 4149 100 1049
Relay Output (SIL 1) 1.65
03
3.7
07
87% 82% 5% 2% 3991 369 1142
The PFD figures quoted above assume a nominal one-year proof test interval and 8-hours repair time (MTTR).
The Searchline Excel Plus & Edge internally has an HFT of 0 and is defined as a Type B device as per IEC 61508.
The diagnostic test interval for the Searchline Excel Plus & Edge is less than 30 seconds in normal operation.
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