Levels of Hardware Fault Tolerance (HFT) are specified in functional safety standards IEC 61508 and IEC 61511, primarily for safety reasons. Very generally speaking, the higher the safety …

This article elaborates basic definition and use of HFT, SFF, and PFDavg terms which are widely used during the SIL verification process.

Feb 18, 2011 · Each subsystem must be checked to assure compliance with minimum hardware fault tolerance (HFT) requirements.

Safety integrity is the ability of the safety instrumented system (SIS), to perform the required safety function as and when required. Four levels of safety integrity are defined, each …

Hardware Fault Tolerance is, as you’d expect from the name, the ability to tolerate hardware faults. A 1oo2 (1 out of 2) redundant arrangement can tolerate 1 hardware fault, so has HFT = …

The maximum claimed SIL, in terms of systematic capability, for the function is SIL 2, with the exception of the Sensor IS Barrier, and Final Elements Solenoid, for which no data is available.

The TTH300, TTH200, TTF300, TTF200 temperature transmitter are head or field mounted 2-wire 4 to 20 mA devices with HART communication protocol for the temperature monitoring of …

Depending on the SIL Safety Integrity Level according to standard IEC 61508. * for the safety-related system, the IEC 61508 standard requires a specific hardware fault tolerance (HFT) in …

Even with the 2oo2 redundant configuration, the highest SIL rating that can be achieved is still SIL 2. The level of redundancy does not automatically equate to a higher SIL rating; it must be …

The table includes columns for Hardware Fault Tolerance (HFT), where HFT = 0 indicates the use of a module in a simplex, non-redundant arrangement, and HFT = 1 indicates the use of a …