Directed Electronics 3100 Instruções de Operação descarregar pdf (Página 29)

Set the mode switch on the sensor to "max"

Use as overﬁll protec-

tion system

Use as dry run pro-

tection system

Safe condition "covered""uncovered"

Output current in safe

condition

12.5 mA … 23.5 mA 2.3 mA … 11.5 mA

Error current "Fail L ow "<2.3 mA < 2.3 mA

Error current "Fail High">23.5 mA > 23.5 mA

Set the mode switch on the sensor to "min"

Use as overﬁll protec-

tion system

Use as dry run pro-

tection system

Safe condition "covered""uncovered"

Output current in safe

condition

2.3 mA … 11.5 mA 12.5 mA … 23.5 mA

Error current "Fail L ow "<2.3 mA < 2.3 mA

Error current "Fail High">23.5 mA > 23.5 mA

If the measuring system delivers output currents of < 2.3 mA

(Fail Low) or > 23.5 mA (Fail High), this may indicate a failure.

The processing unit must therefore interpret such currents as

failure and output a suitable fault signal.

If this is not the case, the appropriate shares of the failure rates

must be assigned to the dangerous failures. Therefore the

stated values in chapter " Safety-relevant characteristics" can

deteriorate.

The processing unit must correspond to the SIL level of the

measuring chain.

IfaSU 501 (Ex ) is used for evaluation, the mode switch on the

sensor must be set to "max ". The signal conditioning instru-

ment SU 501 (Ex) must be operated acc. to the quiescent

current principle (use closing contact of the relay).

Conﬁguration of the process-

ing unit

Functional safety

OPTISWITCH 3100 C - with two-wire output 29

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Directed Electronics 3100 Instruções de Operação Página 29