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Using the STA as a Single Loop Logic Solver in a Temperature Application

The Problem

We needs to implement several temperature related Safety Instrumented Functions (SIF) in multiple areas throughout our plant. The SIF needs to be IEC 61511 compliant and involves a Logic Solver, Sensor and Final Control Element.

The Solution

The SIL 2/3-capable STA Safety Trip Alarm, part of the Moore Industries Function Safety Series, can be used as an effective yet affordable Single Loop Logic Solver to slam shut or open a valve to mitigate a dangerous process condition. Additionally, the STA can retransmit the temperature signal to a Basic Process Control System for additional monitoring or control purposes.

Model Number Example STA / TPRG / 3PRG / 24DC / -AO [DIN]logic solver temperature


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