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What is a 2-wire 4-20mA current transmitter? How do I use one?
2-wire transmitters are loop powered devices most commonly used to monitor a remote process with no access to a local supply. Two analog signal wires carry both the analog output signal, and power for the sensor/monitoring circuitry and transmitter. The attached blog series will provide an overview and explain the design considerations of 2-wire systems.
2-Wire 4-20mA Sensor Transmitters: Background + Compliance Voltage
2-Wire 4-20 mA Sensor Transmitters: Understanding the 2-wire Transmitter GND
2-Wire 4-20mA Sensor Transmitters: Sensor and Transmitter Current Consumption Limitations
2-wire 4-20mA transmitters: Controlling 2-Wire Transmitter Outputs with Externally Powered Sources
2-wire 4-20mA sensor transmitters: Designing Input Isolated 2-Wire Sensor Transmitters
2-wire 4-20mA sensor transmitters: Increasing Sensor Power with Switching Power Supplies
Industrial DACs: How to design 2-wire transmitters
Industrial DACs: How to protect 2-wire transmitters
Analog input, analog output: XTR101, XTR105, XTR106, XTR112, XTR115, XTR116, XTR117
Digital input, analog output: DAC161S997, DAC161P997
You can check out the post titled: Are there reference designs that can help me build a 4-20mA transmitter? For help finding reference designs using some of the above devices.
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