Application Notes
AN-300 Simple Circuit Detects Loss of 4-20 mA Signal (Rev. B)
Texas Instruments
Published : 23 Apr 13
Description
Four-to-twenty milliampere current loops are commonly used in the process control industry. They takeadvantage of the fact that a remote amplifier can be powered by the same 4-20 mA current that it controlsas its output signal thus using a single pair of wires for signal and power. Circuits for making 4-20 mAtransmitters are found in the LM10 LM163 and LH0045 data sheets.
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