- November 26, 2014
- Moore Industries-International, Inc.
The STA Safety Trip Alarm was created in response to the rapidly growing demand by U.S. and international process engineers for plant-critical IEC 61508 Functional Safety applications. Part of the company’s FS FUNCTIONAL SAFETY SERIES, the STA is certified to IEC 61508 standards by exida for single use in Safety Instrumented Systems up to SIL 2, with firmware which allows the STA to be used in a redundant architecture (1oo2, 2oo3, etc.) up to SIL 3.
Easier to use and significantly more affordable than a typical safety PLC, the STA can work as an extension of a larger control system or perform localized control or annunciation in safety settings. It acts as a single loop logic solver that performs these functions:
- Warning of and acting on unwanted or potentially hazardous process conditions
- Providing emergency shutdown in Safety Instrumented Systems
- Providing on/off control and traditional alarm trip functions
- Locally displays and retransmits PV status
- Utilizing the analog retransmission the STA is a SIL 2 capable Temperature Transmitter
The 4-wire (line/mains-powered) STA accepts a signal input from transmitters (current and voltage inputs), temperature sensors (RTD and thermocouple inputs), resistance and potentiometer devices to handle a wide range of monitoring and safety 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 be used by a competent functional safety practitioner to determine the unit’s applicability as a logic solver in specific safety-related applications.
STA Safety Trip Alarm