What is new? What is important?
The optional safetyclassifications SIL1 to SIL4:What should be noted? As a rule, all Pepperl+Fuchs devices with a SIL rating can be used directly as standard types in SIL2 applications. To this end a simple evaluation structure (e.g. 1oo1), is adequate to achieve the customary industrial cycles for function checks (e.g. annual intervals). The functional reliability of the complete risk-reducing measure is always expressed with the SIL level. Therefore all the components, which contribute to this measure, have to be given consideration.
Attention
Devices for applications inthe safety level SIL1Simple evaluation structure The signal circuit with a simple 1oo1 evaluation structure has no hardware fault tolerance(HFT = 0). The failure of a device can result in the loss of the safety function.
Analogue Professional transmitter 1oo1
IN signal processing Hardware fault tolerance: as a rule, 1oo1 is always adequate Proof interval: up to 5 years is possible Devices for applications inthe safety level SIL2Simple evaluation structure The signal circuit with a simple 1oo1 evaluation structure has no hardware fault tolerance(HFT = 0). The failure of a device can result in the loss of the safety function.
Analogue Transmitter 1oo1
IN signal processing Hardware fault tolerance: as a rule, 1oo1 is always adequate Proof interval: approx. 1 year Devices for applications insafety level SIL3Redundant evaluation structure (SIL2 and SIL3 with the same devices) The signal circuit with a redundant 1oo2 evaluation structure has a hardware fault tolerance of 1 (HFT = 1). The failure of a device does not lead to the loss of the safety function.
Analogue TransmitterIN Analogue 1oo2
Transmitter signal processing IN Hardware fault tolerance: as a rule, 1oo2 is necessary Proof interval: approx. 1 year Devices for applications insafety level SIL4 The SIL 4 risk is too high to be covered by the normal process technology means. In such
professional cases the operator is advised to seek alternative process means with an inherently higher level of safety.
Attention
Date of issue03/03/06 – Catalogue K-system Subject to reasonable modifications due to technical advances.Copyright Pepperl+Fuchs, Printed in Germany Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com 13