SIL Rating of Alarm Annunciators

Because of their critical application in protecting people and assets, alarm annunciators need to be demonstrated to be reliable under any condition. When alarms are programmed into PLC or DCS software, there is always the undefinable risk that an error in the software programming will mask the alarm when it is most needed. For this reason, alarm annunciators undergo rigorous qualification during the design phase to ensure that their performance can be assured to a high enough degree of certainly. More recently, the IEC61508 standard has become the norm by which most safety systems are rated. According to this standard, safety loops must meet a defined "Safety Integrity Level" which required definitive calculation of the reliability of every component in the safety loop including the alarm annuncaitor and the operator. The Omniflex Omni16 family of alarm annunciators have undergone independent scrutiny to ensure that they comply with the highest required level of safety for alarm indication systems.

For more information on SIL Rating of Alarm Annunciators talk to Omniflex UK Limited