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Product of the Month: STA Functional Safety Trip Alarm

Product of the Month: STA Functional Safety Trip Alarm
Risk reduction, reliability, and safety are important factors in the automated control of potentially hazardous processes such as the overpressure and containment of dangerous substances. Process Industry personnel are always aware of the need to protect people, the environment, and facilities as part of their overall risk management plan. A central strategy employed today includes safety instrumented functions (SIF), or functional safety, utilizing IEC 61511 standards. A crucial instrument in a safety instrumented system is the logic solver, which acts as a decision maker initiating the final action to make the process safe should the need arise.
Published: January 19, 2017

EHELP: STA Latching Checkbox

EHELP: STA Latching Checkbox

Q: We do not have sufficient PLC digital output spares to perform a Manual Reset of the three installed safety temperature controllers. We are going to remove the alarm latching on both limits and faults on our STA Functional Safety Alarm Trip. The Manual Reset radio button stays active in the STA configuration software. Will the latches clear after we are outside the dead band limits? 

Published: January 10, 2017

EHELP: Are the STA and SPA2 process alarm relays configurable as Failsafe?

EHELP: Are the STA and SPA2 process alarm relays configurable as Failsafe?
Q: For the STA 4-Wire SIL 2 and SIL 3 Compliant Programmable Current/Voltage and RTD/Thermocouple Safety Trip Alarms, can the process alarm relays be configured as Failsafe?  Can the process relay output of the SPA2-TRPRG be configured Failsafe?
Published: November 15, 2016

Alumina Refinery: Overpressure Protection of a Filter Vessel

Mining & Metal Refining Industry

Alumina Refinery: Overpressure Protection of a Filter Vessel
The process of converting bauxite to alumina for aluminium metal refining involves a complex manufacturing process.  Much of this process requires critical temperature and pressure control, which if left unchecked could result in catastrophic consequences. Learn how Moore Industries solved this problem for an alumina refinery in Australia.
Published: October 20, 2016

EHELP: STA Analog Output Protection

EHELP: STA Analog Output Protection
Q:  In specifying the Moore STA / HLPRG / 3PRG / U / -AO [DIN] our end user has a concern about electrical protection for the analog output. The desire is to use 4-20mA Output Loop Voltage sourced by DCS for the AO; however, this voltage may fault at up to 132 VAC. Should our design add fuse protection in the external voltage circuit upstream of the STA to protect it from these surges? Or does the STA include features that protect it from these faults?
Published: October 4, 2016
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