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Special conditions to comply with the requirements of IEC 61508
SUPREMATouch 71 US
4 Special conditions to comply with the requirements of IEC 61508
for SIL 1–3 according to TÜV Certificate
4.1 Conditions for configuration, installation, operation and maintenance
Common Conditions for safety operation
The following criteria have to be considered for all safety-related applications
(1) The Locking [Inhibit] of measuring inputs is only allowed during maintenance and repair.
(2) After any configuration or parameterisation a verification has to be completed by reading
back the data and comparing with the SUPREMA configuration or parameterisation soft-
ware.
(3) The alarm conditions of the SUPREMA must be periodically checked together with the typi-
cal gas calibration checks.
(4) The alarm and relay functions must be tested at least once per year.
(5) The locking [inhibit] of measuring points must be safety related processed via the inhibit re-
lay.
(6) Failure of measuring points must be safety related signalled via the MS-Fail relay.
(7) Sensor cables must be protected from mechanical damage [e. g. by using armoured cable].
(8) The relays must be energised under normal conditions.
(9) The relay contacts must be protected with a fuse rated at 0.6 of the nominal specified relay
contact current.
(10) The system fail relay contacts (even for satellites) must be safety related processed for warn-
ing purposes.
(11) All inputs of MSI module must be used in open and short circuit detection mode.
(12) In galvanically coupled system components the ground connections of all power supply must
be connected.
(13) In case of failure of any component the repair or replacement must be completed within
72 hours.
(14) Only modules and components with the Hardware and Software Versions specified in chap-
ter 4 may be used.
(15) The notes in the Operation Manual for installation, operation and maintenance have to be
considered.
(16) An ambient temperature above 40 °C is to be avoided.
(17) All devices connected to one MRO module must have the same voltage level.
(18) The ground fault current recognition of the MFI modules is to be tested at least annually.
(19) External power supplies must fulfil, as a minimum, the requirements of EN 60950 and
EN 50178.
(20) During installation of the SUPREMA - Fire and Gas Warning System the national regulations
and standards must be complied with.
(21) The installation of the SUPREMA - Fire and Gas Warning System has to be done in such
away that a maximum degree of pollution 1 [EN 60664-1] is ensured [no or only dry, not con-
ductive contamination arises. The contamination does not have influence].
(22) In the case of using the MLE modules the conditions which are described in Technical Report
No: 968/EZ 163.04/04 dated 2004-11-22 are to be considered.