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EHELP: Need a Signal Isolator with Input of 0-5VDC

EHELP: Need a Signal Isolator with Input of 0-5VDC

Q. We are looking for a signal isolator. We need an input of 0-5VDC, output 4-20mA and the unit needs to be output loop powered.  What do you recommend?

Published: September 27, 2017

EHELP: Application for an Analog Splitter

EHELP: Application for an Analog Splitter

Q. I have an application that requires an analog splitter. The single input signal to the splitter comes from a transducer, and the transducer requires loop power. The two outputs are going to an active analog monitoring card on a PLC, which provides power to the connected 4-20mA signals. Is the ECT what I need?

Published: February 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

Burner Management System Signal Splitter Application for a Pulp and Paper Mill

Pulp and Paper Industry

Burner Management System Signal Splitter Application for a Pulp and Paper Mill

A pulp and paper mill had a black liquor BMS (Burner Management System) that per NFPA 85 requires that its safety logic system be totally independent from other logic systems.  The challenge was they required that key temperature and pressure signals also get monitored and recorded by their BPCS (Basic Process Control System). Learn how Moore Industries solved this problem.

Published: September 28, 2016

EHELP: HIX Minimum Output Value

EHELP: HIX Minimum Output Value

Q:  HIX Application - It appears that if the "Primary Master" loop (input loop side of the HIX) is broken or open circuited, the "Secondary" loop (output loop side of the HIX) will be 0mA.   Is this true?  Maybe I can put a zener across the primary process terminals to keep the current loop when the process opens? Also, are both or either loops bi-directional HART? I have a 4-20mA input signal that I'd like to share between two 4-20mA/HART process loops. Actually, we currently use another vendor's device to "split" one 4-20mA input to four process loops but it doesn't pass HART.

Published: August 9, 2016
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