KROHNE OPTISWITCH 5xx0C Transistor SIL EN - Manual (Page 7)

The function of the adjustment elements is described in the operating
instructions manual.
1 .4 Setup
Take note of the mounting and installation instructions of the operating
instructions manual.
In the setup procedure, a check of the safety function by means of an
initial filling is recommended.
1 .5 Reaction during operation and in case of
failure
The adjustment elements or device parameters must not be modified
during operation.
If modifications have to be made during operation, carefully observe
the safety functions.
Fault signals that may appear are described in the appropriate
operating instructions manual.
If faults or error messages are detected, the entire measuring system
must be shut down and the process held in a safe state by other
measures.
An exchange of the electronics is easily possible and is described in
the operating instructions manual.
If due to a detected failure the electronics or the complete sensor is
exchanged, the manufacturer must be informed (incl. a fault
description).
1 .6 Recurring function test
The recurring function test is used to check the safety function, to
detect possible non-recognisable, dangerous faults. The function of
the measuring system must be checked in adequate intervals.
The operator is responsible for choosing the type of check. The time
intervals depend on the selected PFD
avg
value according to chart and
diagram in paragraph "Safety-related characteristics".
With high demand rate, a recurring function test is not requested in
IEC
61508. The function of the measuring system is demonstrated by
the frequent use of the system. In double channel architectures it is a
good idea to verify the redundancy through recurring function tests at
appropriate intervals.
The test must be carried out in a way that verifies the flawless
operation of the safety functions in conjunction with all system
components.
Mounting and installa-
tion
Reason and implemen-
tation
OPTISWITCH series 5000 • - transistor (NPN/PNP) 7
1 Functional safety
32749
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EN
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100128