The 4- to 20-mA current loop is ubiquitous in the world of controls in manufacturing plants. Discrete logic, microprocessors, and microcontrollers easily cover the digital portions of control schemes, ...

You know the “just add a transistor” drill by now: a performance or functionality requirement comes up that you can’t support entirely using the blocks built into your favorite mixed-signal ...

The I/O capabilities built into most microcontrollers make it easy to measure the analog world. Say you want to build a data logger for temperature. All you need to do is get some kind of sensor that ...

Current-mode control loops (particularly the popular 4- to 20-mA controls) are used in many industrial applications because of their immunity to induced EMI from motors, contactors, relays, and other ...

NORWOOD, Mass.--(BUSINESS WIRE)-- Analog Devices, Inc. (NAS: ADI) introduced today the CN0267 demonstration circuit for a loop powered HART® (Highway Addressable Remote Transducer) enabled smart ...

Use of 4-to-20-mA current loops involves more than just a simple series connection between sensor, display, and power supply. The point where a sensor takes a measurement is, at times, many yards away ...

Using an analog temperature sensor, an op amp, a transistor, and a low-dropout linear regulator, this circuit provides a 4-to-20-mA output over a 3.75- to 28-V compliance range (see the figure).

Each channel operates independently to prevent interaction between channels. Galvanic isolation eliminates ground loops, reduces noise, and blocks transient signals. Splitters are available in 2-wire ...

Imagine this scenario: There is a flow meter with 4–20 mA output setup. The switch is flipped, thereby turning it on. Then it is noted that the readings are off, and the required output is not shown.

Signal Chain Solution for 4-mA to 20-mA HART Enabled Field Instrument Applications NORWOOD, Mass.--(BUSINESS WIRE)-- Analog Devices, Inc. (NAS: ADI) introduced today the CN0267 demonstration circuit ...