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EHELP: Applying the SIX 2-wire Signal Isolator and Converter

EHELP: Applying the SIX 2-wire Signal Isolator and Converter

Q: I am evaluating the SIX 2-wire Signal Isolator and Converter. Is this device auto-calibrated or will we need to calibrate it ourselves? Does it require two separate power supplies? The specs state that the output is loop powered but I am not clear on the input. Also, is it a problem if we supply both the input and output with the same power source?  In our case, it would be the 53.5VDC power supply in the loop currently.  We would need to run a parallel path. The input is intended to be a 4-20mA.

A: The SIX is provided pre-calibrated from the factory for the input and output indicated in the model number. The device has potentiometers accessible on the front panel for making adjustments to the zero and span.

The SIX derives its operating power from the voltage that is applied to its output. It consumes 12V of the available voltage applied to its output. The SIX accepts a voltage or current input. If the input is 4-20mA, then the SIX will add 50 ohms of impedance to that loop.

Regarding supplying both the input and output with the same power source, the primary purpose of the SIX is to provide input to output galvanic isolation. Using the same power supply for both would defeat that isolation.

Published: February 23, 2016
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