4/20ma loop or 5V solution Expert opinion ..

dark said:

Hi ,I have a Voltage sensor outputting 4/20ma signal . Its to be placed inside panel box. My meter is to be placed 3meters away from the sensor/panelbox. I need to know;

1) Should I place a shielded cable and drop 4/20ma by 250E resistor and feed it to ADC of MCU directly .

2) Do I require expensive Instrumentation amplifier solution? BUT the distance of signal travel is too less .

4) Should I use a sensor with 0~5V output directly with shielded cables.

Please note around the process , I could see alternator and other DC motors (Big one in about 100KW)operating .

Expert advice is most desirable . Rgds

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dark said:

Thanks for the reply, I will get the twin screened cable earlier I was planning for single shielded cable. Should I terminate it at sensor end or the MCU/ADC end. Regards

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