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EHELP: What is the maximum impedance that the output of an output loop powered ECT-DIN can drive?

EHELP: What is the maximum impedance that the output of an output loop powered ECT-DIN can drive?

Q. What is the maximum impedance that the output of an output loop powered ECT-DIN can drive?

A. For the output powered ECT (model ECT/4-20MA/4-20MA/12-42DC [DIN]) the max impedance that the output can drive depends on the loop voltage that you supply in series. For example, if you use a 24Vdc supply in series with the ECT’s output, the ECT uses 12V of the 24, and 12V is left over to handle loop loads: 12V/.02A=600 ohms. Note that you may want to account for the transmitter tied to the input of the ECT going to a fail high level of 23mA.  If so, then the max impedance level will only be 521 ohms.

The ECT-DIN is a signal isolator, converter, repeater, booster and splitter and is available in 2-wire and 4-wire powered models with the ability to match the ECT to the type of AC or DC power available at each location, superior signal isolation up to 1500Vrms, and RFI/EMI protection. 

The ECT-DIN also allows you to send the output from one transmitter to a second location. Additionally you can protect expensive monitoring/control equipment by eliminating common electrical paths or create a buffer between devices to allow interruption of one leg of a loop without impacting the other (see gallery image below for example). The ECT-DIN can even step down unsafe high level signals with an optional external input transformer (-EM option), allowing you to step down high level AC current inputs.

Learn more about the ECT-DIN.

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Published: April 27, 2017
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