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E-HELP: Differential Temperature Measurement with Two RTDs

E-HELP: Differential Temperature Measurement with Two RTDs

Q: I am looking for a differential temperature transmitter. We have used the SPT in the past and know that it will work, but I don’t know if you can use two inputs of two different 4-wire RTDs with the SPT.

A: The SPT has only four input terminals; therefore the number of RTD wires is limited. For differential temperature one RTD can be a 3-wire and the other RTD can only be a 2-wire. The lead length compensation wire of the 3-wire connection compensates for the lead length of both RTDs. This is only useful if you make sure that all five wires have the identical resistance.

Published: June 16, 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: Setting Multiple Trip Setpoints with the ECA

E-HELP: Setting Multiple Trip Setpoints with the ECA

Q: I am interested in an ECA alarm unit, model #: ECA/4-20MA/DH1H1/24DC/DIN. I have three questions:

1. I have a need for three different trip setpoints based on the same transmitter input. How can I accomplish this with the ECAs? Can I use two ECAs using the second ECA with a 1-5VDC input or can the 4-20mA signal be run in series through both ECA inputs?

2. Do I need to specify the -RF option to get the RFI protection? And is the testing for both radiated and conducted susceptibility (RS103, CS114, CS115)? Is it possible to see the test report for the EMI/RFI testing?

3. Is DIN-rail the only mounting option?

Published: June 9, 2015

Control Design Article Highlights Changing Role of Remote I/O

Control Design Article Highlights Changing Role of Remote I/O
Control Design recently took a look at the current state of remote I/O. Contributing Editor Hank Hogan suggests that remote I/O is becoming “smaller, faster, customizable and intelligent” thanks to innovations within the industry.
Published: June 8, 2015

The HCS as a Diagnostic Tool

The HCS as a Diagnostic Tool

We know it is easier for many customers to communicate using MODBUS RTU protocol than HART protocol and that makes the HCS HART® Concentrator System a very popular tool.

We also know customers want more diagnostic information so they can access the health of their processes and instrumentation. HART Command 48 is what the industry and the HCS uses to retrieve diagnostic information from the HART slave device, whether that is a transmitter or a valve positioner. The HCS will not implement Command 48 unless you turn on that feature by checking “Acquire Additional Status” on the HART tab of the configuration software.

Published: May 18, 2015
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