Directed Electronics 3100 Betriebsanleitung PDF herunterladen (Seite 31)

This is ensured by a controlled reaching of the response height

during ﬁlling. If ﬁlling up to the response height is not possible,

then a response of the measuring system must be triggered by

a suitable simulation of the level or the physical eﬀect.

The methods and procedures used during the tests must be

stated and their suitability must be speciﬁed. The tests must be

documented.

If the function test proves negative, the entire measuring

system must be switched out of service and the process held

in a safe condition by means of other measures.

In the double channel architecture 1oo2D this applies

separately to both channels.

If the measuring system is used as overﬁll protection, the proof

of the function is ensured by a simple function test which can

be triggered and monitored manually or by a connected control

system.

This function test is triggered by interrupting the supply cable

for at least two seconds, then a switch on procedure follows as

described in the operating instructions manual.

If the test is carried out this way, make sure that the vibrating

element is not covered.

If the evaluation is made by a control system, the correct

sequence of the current change must be checked and

documented.

If a connected signal conditioning instrument is used for

evaluation, the recurring function test can be carried out by

simply pressing the test key on the signal conditioning

instrument. You will ﬁnd more details in the operating

instructions manual of the signal conditioning instrument.

Suitable signal conditioning instruments are listed under

Technical data.

9.6 Safety-related characteristics

The failure rates of the electronics and the vibrating system

were determined by an FMEDA acc. to IEC 61508. Basis for

the calculations are component failure rates acc. to SN 29500.

All values relate to an average ambient temperature of +40°C

(+104°F) during operation. The calculations are further based

on the instructions stated in chapter "Planning".

Recurring function test when

using the measuring system

as overﬁll protection

Functional safety

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