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EHELP: Application for an Analog Splitter

EHELP: Application for an Analog Splitter

Q. I have an application that requires an analog splitter. The single input signal to the splitter comes from a transducer, and the transducer requires loop power. The two outputs are going to an analog monitoring card on a PLC, which provides power to the connected 4-20mA signal signals. Is the ECT what I need?

A. If you need a device with two outputs and with output loop power, the MIX would be a good choice. However, this model does not provide loop voltage to the input. It is a dual channel isolator so you would connect the input signal in series to the two input channels. MIX 2 and 4-channel models draw operating power from the loop output side, where power is typically made available by the receiving device, such as a DCS or PLC.

The ECT “Splitter” on the other hand provides loop voltage to the transducer, and it also provides the voltage to the two output loops. It requires a power source separate from the output signals.

You can specify either 24DC or 117AC for the separate power input. If the outputs must be compatible with a control system input card that is providing loop voltage then the EP option for the ECT modifies them to be passive. However, a separate power source is still required. The ECT offers Superior signal isolation (up to 1500Vrms). An ECT with the following model number would meet your application requirements: ECT/4-20MA/4-20MA/24VDC/-EP [DIN]

Quality and industrial strength protection stops ground loops, motor noise, and other electrical interference from affecting process signals. The ECT offers RFI/EMI protection against the unpredictable, harmful effects of radio frequency and electromagnetic interference. There is even a –RF option for enhanced protection in especially noisy environments.

Please visit our Interface Solution Download Center for more information on the MIX or the ECT line of products.

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Published: February 9, 2017
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