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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

SPA2IS Controls and Monitors Wet Wells

Wastewater Treatment Application

SPA2IS Controls and Monitors Wet Wells
Municipalities often have several wet well locations around a city that pump waste from low lying areas up to main sewage veins that feed waste treatment plants.  Level instruments monitor the wet well level and controllers then engage the grinder pumps.  Since wet wells contain waste, volatile gasses such as methane require that these level instruments be rated for use in Class I, Div 1 environments.
Published: January 9, 2017

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

EHELP: SPA Power Consumption

EHELP: SPA Power Consumption

Q:  We are considering ordering the Moore Industries SPA/0-100mV/2 PRG/U/-SOL [DIN]. Can we power it using 24VDC? If so, what is the power consumption and how do we terminate? Also, can you please confirm whether this unit is Class 1 Div2, group A,B,C,D?

Published: September 13, 2016
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