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Sharing Process Variables: HART Functionality

Problem: When sharing a Process Variable (PV) with single or multiple systems, the connection needs to be thought out carefully especially when considering additional scenarios to this application: HART functionality and Safety Instrumented Systems.

Published: January 9, 2018

E-HELP: Isolating Feedback on VFDs

E-HELP: Isolating Feedback on VFDs
Q: We are a boiler/burner company dealing with a rising amount of computer-based burner controls. We have installed several and have some blowers that are controlled by VFDs (Variable Frequency Drives). We have run into issues with noise on certain systems. We get occasional problems with 4-20mA feedback from the VFD despite going through the proper grounding techniques. We are wondering if installing an opto isolator on the feedback loop might eliminate our issue. We have used the SIX Signal Isolator many times on the signal going to the VFD to offset impedance issues on the VFD. Can we put an opto isolator on both signals?
Published: January 3, 2018

EHELP: Is there a Dual Signal Isolator/Converter/Splitter for Different Outputs?

EHELP: Is there a Dual Signal Isolator/Converter/Splitter for Different Outputs?
Q. As part of a power distribution process I need a dual signal isolator/converter/splitter that has an input of 0-1mA, outputs of 0-1mA and 4-20mA with 117VAC power input? It needs a DIN housing so it can be mounted in an existing cabinet.
Published: November 15, 2017

EHELP: Is there a signal conditioner with 0-2Vdc input & 2 isolated 4-20mA outputs?

EHELP: Is there a signal conditioner with 0-2Vdc input & 2 isolated 4-20mA outputs?
Q. Is there a signal conditioner with 0-2Vdc input and two isolated 4-20mA outputs with 24Vdc?  I need it as compact as possible because I need to install it horizontally in a cabinet. 
Published: July 26, 2017

EHELP: Can you help specify a splitter that can send the signal to both control systems?

EHELP: Can you help specify a splitter that can send the signal to both control systems?

Q. I have two different control systems and I need some splitters to split a 4-20 mA signal. I may need to have the loop isolated. Can you help specify a splitter that can send the signal to both control systems where I can use the splitter connected in a series on the original loop? My company has used the SIX in the past, would this work?

Published: July 12, 2017
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