Proof Test Interval; Special Notes - Honeywell SEARCHLINE EXCEL PLUS Safety Manual

3.1 Proof Test Interval
The purpose of a proof test is to return the unit to 'as new' condition in terms of its safety parameters.
The nominal proof test interval is 12 calendar months but, as stated in IEC 61508 and always dependent on local
conditions, users may vary the proof test interval to meet their system needs. Honeywell allows such variations provided
that the proper calculation method for calculating a proof test interval – as defined in IEC 61508 – is used to attain
the required SIL level.
Proof test variations will depend on the system, hardware architectures and applications, and should be reviewed annually.
Given that relay outputs could be complex to isolate and test, the user may determine that a longer proof test interval would
be desirable. The table below can be used to understand the different PFD & PFH values for these differing interval.
Note:
The nominal proof test interval should not preclude more frequent maintenance of Searchline Excel Plus & Edge
in accordance with the Operating Instructions if site conditions or other factors require it.
3.2 Special Notes
1. This safety manual does not address installation, configuration, service, maintenance or decommissioning tasks.
The Searchline Excel Plus & Edge Technical Manual must be read and referred to in order to accomplish these tasks.
Please read and understand the Searchline Excel Plus & Edge Technical Manual in full as this document also contains
important safety information regarding the installation and continued use of the product.
2. Searchline Excel Plus & Edge proof tests shall be carried out strictly in accordance with this manual while referring
to the Searchline Excel Plus & Edge Technical Manual as required, and also by including any additional instructions
or requirements that may be issued from time-to-time. Searchline Excel Plus & Edge must not be stored or otherwise
exposed to temperatures or conditions outside of the allowable maximums listed in the Technical Manual and/or
datasheet.
3. It is incumbent on all 3rd-Party OEMs and Partners to enforce these rules on all Searchline Excel Plus & Edge
equipment and assemblies manufactured and supplied by Honeywell.
4. Modification of settings in the Searchline Excel Plus & Edge shall strictly follow the procedure detailed in section 9.8
of the Searchline Excel Plus & Edge Technical Manual. Following modification of any settings in the Searchline Excel
Plus & Edge, the entire list of settings must be reviewed to ensure that the product configuration is correct. A proof test
should then be undertaken to ensure the functionality of the product is understood and is as expected.
5. Access to the product is possible remotely using either the HART or Bluetooth connection. Security is provided on these
connections by the use of authentication passwords and tokens. The user must take care to ensure such passwords
and tokens do not become known to unauthorised parties. In case of concern, such passwords should be immediately
changed to prevent unauthorised access to the product.
6. It is possible to upgrade the firmware in the Searchline Excel Plus & Edge using the mobile application. Before
performing an upgrade, the user must check that the new firmware has already been certified to the relevant functional
safety standard. When performing an upgrade the procedure listed in section 9.9 of the Technical Manual must
be followed and following upgrade the version string interrogated to ensure it is as expected (see section 9.8.1 of
the Technical Manual. A proof test should then be undertaken to ensure the functionality of the product is understood
and is as expected.
The effect of different proof test intervals on the PFD

Proof Test Interval

mA Output
6 months 2.53
-04
1 year 4.73
-04
1 1/2 year 6.92 -04
2 years 9.11
-04
3 years 1.35 -03
4 years 1.79
-03
5 years 2.23
-03
6 years 2.67
-03
7 years 3.10
-03
8 years 3.54
-03
9 years 3.98
-03
10 years 4.42
-03
Searchline Excel Plus & Edge™ – Safety Manual
:
avg
PFD
Relay
8.44
-04
1.65
-03
2.46 -03
3.27
-03
4.89 -03
6.51
-03
8.12
-03
9.74
-03
1.14
-02
1.30
-02
1.46
-02
1.62
-02
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