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Safety trip alarm

15 April 2009

In response to the rapidly growing demand by U.S. and international process engineers for interface instruments for plant-critical IEC 61508 Functional Process Safety applications, Moore Industries has introduced the STA Safety Trip Alarm. The STA firmware is suitable for a SIL 3 system, which allows the STA to be used in a redundant architecture (1oo2, 2oo3, etc.) up to SIL 3.

The STA Safety Trip Alarm performs as a logic solver and acts on potentially hazardous process conditions; warns of unwanted process conditions; provides emergency shutdown; or provides on/off control in Safety Instrumented Systems (SIS) and traditional alarm trip applications.

The STA provides three failsafe alarm outputs. Two are configurable process alarms that trip when a monitored process variable falls outside of user-set high and/or low limits. The third alarm is a non-programmable, latching alarm that is activated if any internal faults are found by the STA’s extensive internal diagnostics. This fault relay is also triggered if the input is faulty or broken.

The STA is provided with comprehensive FMEDA (Failure Modes, Effects and Diagnostics Analysis) certified safety data to to determine the unit’s applicability as a logic solver in specific safety-related applications.