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  2. Current loop - Wikipedia

    en.wikipedia.org/wiki/Current_loop

    Control valve with pneumatic diaphragm actuator and "smart" 4–20 mA positioner which will also feed back the actual valve position and status over the current loop. The 4–20 mA convention was born in the 1950s out of the earlier highly successful 3–15 psi pneumatic control signal standard, when electronics became cheap and reliable enough ...

  3. Digital current loop interface - Wikipedia

    en.wikipedia.org/wiki/Digital_current_loop_interface

    Older teleprinters used a 60 mA current loop. Later machines, such as the Teletype Model 33, operated on a lower 20 mA current level and most early minicomputers featured a 20 mA current loop interface, with an RS-232 port generally available as a more expensive option. The original IBM PC serial port card had provisions for a 20 mA current ...

  4. Signal Chain Solution for 4-mA to 20-mA HART Enabled Field ...

    www.aol.com/news/2013-03-26-signal-chain...

    Signal Chain Solution for 4-mA to 20-mA HART Enabled Field Instrument Applications NORWOOD, Mass.-- ... (NAS: ADI) introduced today the CN0267 demonstration circuit for a loop powered HART ...

  5. Highway Addressable Remote Transducer Protocol - Wikipedia

    en.wikipedia.org/wiki/Highway_Addressable_Remote...

    In point-to-point mode the digital signals are overlaid on the 4–20 mA loop current. Both the 4–20 mA current and the digital signal are valid signalling protocols between the controller and measuring instrument or final control element. The polling address of the instrument is set to "0". Only one instrument can be put on each instrument ...

  6. Signal Chain Solution for 4-mA to 20-mA HART Enabled Field ...

    www.aol.com/2013/03/26/signal-chain-solution-for...

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  7. Proportional–integral–derivative controller - Wikipedia

    en.wikipedia.org/wiki/Proportional–integral...

    In the 1950s, when high gain electronic amplifiers became cheap and reliable, electronic PID controllers became popular, and the pneumatic standard was emulated by 10-50 mA and 4–20 mA current loop signals (the latter became the industry standard). Pneumatic field actuators are still widely used because of the advantages of pneumatic energy ...

  8. Integrated Electronics Piezo-Electric - Wikipedia

    en.wikipedia.org/wiki/Integrated_Electronics...

    The sensor circuit is supplied with constant current. A distinguishing feature of the IEPE principle is that the power supply and the sensor signal are transmitted via one shielded wire. Most IEPE sensors work at a constant current between 2 and 20 mA. A common value is 4 mA. The higher the constant current the longer the possible cable length.

  9. Digital loop carrier - Wikipedia

    en.wikipedia.org/wiki/Digital_loop_carrier

    When the subscriber goes off-hook, a cable pair behaves like a single loop inductance coil with a -48 V dc potential and an Electric current of between 20–50 mA dc. Electric current values vary with cable length and gauge. A minimum current of around 20 mA dc is required to convey terminal signalling information to the network.

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