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INA185: Ina185

Part Number: INA185
Other Parts Discussed in Thread: INA196

Can this device be used in a 4-20ma current loop instrumentation measurement application?  Has anyone done this? If so can you share your experience and any info?

  • Hi Charles,

    can you tell more about your application?


  • Yes basically to convert current from a 24 volt 4-20ma current loop sensor to a 0-5 volt signal (or other range) for input to an A/D converter.  I can do this with a discrete resistor as a shunt now but looking at other  alternatives.

  • Hello Charles,

    Thanks for considering to use Texas Instruments.  You could measure 4 to 20 mA at the high-side with the INA185.  However, there will be some sort degree of error in the measurement.  The error can be attributed to gain error, linearity, offset, CMRR, and PSRR, and shunt tolerance (For more information, check out these tutorial videos).  For your conditions, if I use the RSS of all error terms with the 20V/V gain and 12ohm1% shunt, I would expect the error to be about 2% or better.  If you do an initial calibration with your system, you can remove the offset error and get even less error in your measurement.  If this error is too great, you might need to consider another device.  Typically error gets worse as you approach 0A.  This would be attributed to the device offset and input bias currents.

  • Hi Charles,

    the Arduino guys are using the INA196, if I rememeber correctly. But also with the INA196 Patrick's thoughts should be considered.