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Moore Industries SIL 3 Capable STA Safety Trip Alarm Certified by exida®

Moore Industries SIL 3 Capable STA Safety Trip Alarm Certified by exida®

Part of the Moore Industries FS FUNCTIONAL SAFETY SERIES, the exida® certified SIL 2 and SIL 3 capable STA Safety Trip Alarm performs as a logic solver and acts on potentially hazardous process conditions; warns of unwanted process conditions; provides emergency shutdown; or provides on/off control in Safety Instrumented Systems (SIS) and traditional alarm trip applications. The STA has a systematic integrity up to SIL 3 and random integrity up to SIL 2 which allows the STA to be used in a redundant architecture (1oo2, 2oo3, etc.) up to SIL 3.

Published: June 8, 2016

Temperature Q&A with JR Madden: What is the least expensive way to speed up sensor response time in a thermowell?

Temperature Q&A with JR Madden: What is the least expensive way to speed up sensor response time in a thermowell?

Q. What is the least expensive way to speed up response time of a sensor installed inside of a thermowell? We have a reactor associated with a quickly changing process and need to be able to control any sudden changes. What do you suggest?

Published: June 8, 2016

Temperature Q&A with JR: We are seeing false readings in our outdoor temperature measurement application due to environmental exposure

Temperature Q&A with JR: We are seeing false readings in our outdoor temperature measurement application due to environmental exposure

Q: We have several outdoor temperature applications where we measure the temperatures of pipes running alongside cooling towers. These sensors are in several different locations and zip-tied to the outer surface of the cooling pipes. Our problem has been that exposure to rain, sun and heavy snow causes signals to drop off or spike. We believe moisture is getting into the wire jacket and the environmental exposure is causing false readings. The sensors we use have a PVC jacket over the lead wires and it shows cracking over time. We need to replace the sensors and would like a 4-20mA output signal to go from our junction box out to the field instead of running the sensor lead wires all the way back to our monitoring system. What type of solution do you have for this?

Published: May 25, 2016

EHELP: Using the STA for a high temperature Safety Instrumented Function

EHELP: Using the STA for a high temperature Safety Instrumented Function

Q. Currently we monitor the temperature level in our oven with a thermocouple and let our PLC control the oven. We now need to implement a high temperature Safety Instrumented Function (SIF).  Do we need duplicate temperature sensors and do you have a Functional Safety device that can provide oven shutdown capability on high temperature?

Published: May 24, 2016

EHELP: We need a relay that can withstand high DC current at high voltages

EHELP: We need a relay that can withstand high DC current at high voltages

Q: My Model 330R process monitor with display has configurable threshold output relays that I need to set in order to activate a 125Vdc battery powered circuit which is part of a failsafe control room application. How would I set these up when standard instrument relays are rated at 125/240Vac and 24Vac/dc?

Published: May 23, 2016
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