Directed Electronics 3100 Operations Instructions download pdf (Page 30)

9.3 Setup

The prevailing plant conditions inﬂuence the safety of the

measuring system. For this reason, carefully observe the

mounting and installation instructions in the operator's manual.

It is especially important to make sure the mode setting (min./

max.) is correct.

9.4 Reaction during operation and in case of

failure

l The adjustment elements must not be modiﬁed during

operation.

l If modi ﬁcations have to be made during operation, carefully

observe the safety functions.

l Fault signals that may appear are described in the

appropriate operating instructions manual.

l In case of detected failures or fault signals, the entire

measuring system must be switched out of service and the

process held in a safe condition by means of other

measures.

l An electronics exchange is easily possible and described

in the operating instructions manual.

l If due to the detected failure, the electronics or the

complete sensor is exchanged, the manufacturer must be

informed (incl. a fault description).

9.5 Recurring function test

The recurring function test serves to reveal potential danger-

ous errors that are otherwise not discernible. The function of

the measuring system must be checked at adequate intervals.

The operator is responsible for choosing the type of test and

the intervals in the stated time frame. The time frame depends

on the PFD

avg

value acc. to the chart and diagram in section

"Safety-related characteristics".

In high demand rate, no recurring function test is arranged in

IEC 61508. A proof of the functional eﬃciency is seen in the

more frequent demand of the measuring system. In double

channel architectures it is useful to proof the redundancy by

recurring function tests in 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 install ation

Functional safety

30 OPTISWITCH 310 0 C - with two-wire output

29955-EN-060112

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Directed Electronics 3100 Operations Instructions Page 30

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