268 Safety-Critical Transmitter - 04/04/2011

Safety First

Model 268 is the IEC 61508 TÜV certified safety 2600T transmitter for SIS and critical applications where safety and performances are the main requirement. With internal software and hardware redundancy, the 268 models allow installation in conformance with SIL2 (1oo1) and also to SIL3 in a 1oo2 architecture.

The 268 safety transmitter exceeds the IEC 61508 requirements for SIL2 with a hardware fault tolerance of 1 (HFT = 1) and a safe failure fraction of 98.6%; the diagnostic coverage is 97.7%. HFT = 1 ensures that even in the case of 1 hardware failure, the transmitter can enact the safety function. In addition the following requirements have been assessed as part of the certification process:

  • Functional safety (hardware/software) testing.
  • Electrical safety testing.
  • EMC testing. 
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Diaphragm Seal

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