Over long cable runs, an isolated 4-to-20-mA current loop offers robust noise immunity and tolerance. This characteristic makes it popular for analog data transmission in noisy industrial and ...

The current-loop transmitter in the figure employs an unusual trick to inexpensively implement an optically isolated 4- to 20-mA transmitter: operation of the quad-channel LED/transistor ...

Isolated digital interface Because loop transmitters and receivers must be galvanically isolated, so too must their digital interface and power supply. Transmitter and receiver can be powered by ...

Tucson, Ariz. – A programmable 4- to 20-milliamp current loop transmitter from Texas Instruments Inc.'s BurrBrown product line provides for digital calibration of sensor and transmitter errors, thus ...

Figure 1: This loop-powered 4-20 mA transmitter features PWM drive and galvanic isolation from the input signal. (Click on image to enlarge) The external PWM-encoded signal is a rectangular waveform ...

Sealevel Systems, Inc. adds a new 4-20 mA current loop board to the SeaRAQ family of I/O expansion designed for Relio industrial computers. Related To: Sealevel Systems Inc. Sealevel Systems, Inc.

The firm has a more detailed description of the precision current interface on line in a paper titled “High-Performance, High-Accuracy 4-20mA Current-Loop Transmitter Meets Toughest Industrial ...

When a 4-20mA loop transmitter is calibrated or configured it requires a 24 volt power supply – often in remote field locations without easy access to AC power. Additionally, the standard setup ...

Current POWER Magazine Issue. Issue | May 1 ... The transmitter is loop-powered, so its 4-20 mA signal is not affected by long wiring distances, voltage drops or noise.