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E-HELP: Splitting and Isolating Output Signals to Passive Receivers

E-HELP: Splitting and Isolating Output Signals to Passive Receivers
Q: I need a 4-wire isolator and want to see if your MIT Multi-Channel Signal Isolator will work in my application. I have several 4-wire transmitters where I need to split and isolate the output signal to receivers that are passive (not powered). Will the MIT work provided that I supply 24Vdc power to the unit?
Published: July 1, 2015

E-HELP: Monitoring and Alarming on Critical HART Data with the HIM

E-HELP: Monitoring and Alarming on Critical HART Data with the HIM
Q: Is the SPA2 Limit Alarm Trip compatible with HART and can you pass HART through the unit? Our application is a control valve with a loss of signal cutout. We are using the SPA2 for this with position feedback via a Tri-Loop.

A: The SPA2 HLPRG model can be added to an existing HART loop without disrupting the existing HART communications on the loop. However, the optional analog output of the SPA2 will not contain any of the HART digital components so it won’t be useful for connecting to the Tri-Loop.

Published: June 15, 2015

E-HELP: Splitting an RTD or Thermocouple Input

E-HELP: Splitting an RTD or Thermocouple Input
Q: We are looking to take an RTD or thermocouple signal input and output it to two 4-20mA outputs. We also could take the same temperature input and output the same signal twice. What are our options?
Published: May 12, 2015

E-HELP: Filtering Out AC Noise

E-HELP: Filtering Out AC Noise
Q: Do you have or do you know of a product that will filter out AC noise on an unshielded pair of wires carrying a 4-20mA signal over a distance of approximately 400 feet?
Published: April 14, 2015

Use the SSX to Pass Critical HART Information

Use the SSX to Pass Critical HART Information
A plant upgraded to new Smart HART® field transmitters but was still using their original field-mounted isolators. This meant that engineers in the control room were unable to access the HART transmitters – mitigating the benefits of performing the upgrade.
Published: April 10, 2015
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