Rugged instrumentation for reliable measurement and control

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STA Safety Trip Alarm Video Shows Its Use as a Logic Solver

Want to see exactly how our SIL 3-capable STA Safety Trip Alarm serves as a logic solver that goes beyond what customers would expect from a standard alarm trip? A video available at our Interface Solution Video Library shows how the STA can initiate emergency shutdown procedures or alert personnel of unsafe process conditions.


The video is hosted by journalist and industry expert Peter Welander and features a demonstration of how the STA serves as a Single Loop Logic Solver in Safety Instrumented Systems (SIS). In the video, the STA monitors a “hot pot” filled with water. When the temperature goes above or below set points, dual alarm outputs on the STA signal a warning that an unsafe state has been reached. The video also shows how a third alarm monitors input or instrument faults such as a failed sensor or input signal.


The STA performs some of the same functions as expensive safety PLCs but is more affordable and easier to program. The process alarm trips and analog outputs are user configurable via front-panel push buttons. Configurations can be downloaded to multiple STA units with a free software utility program. It has been subjected to extensive testing by Exida and is fully compliant to IEC 61508. The STA is approved for single use in Safety Instrumented Systems (SIS) up to SIL 2 and in redundant architectures (1oo2, 2oo3, etc.) up to SIL 3.

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