• 2-wire 4-20mA sensor transmitters: Designing Input Isolated 2-Wire Sensor Transmitters (Part 5)

  

  Collin Wells

  Part 4 of this series discussed the issues and requirements involved in the design of a 2-wire sensor transmitter that accepts inputs from an externally powered sensor/source. In this installment, I’ll expand on the concepts presented in that post and…

  • over 7 years ago
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• 2-wire 4-20mA sensor transmitters: Increasing Sensor Power with Switching Power Supplies (Part 6)

  

  Collin Wells

  In part 5 of this blog series , I discussed the construction of an input-isolated 2-wire sensor transmitter. Input-isolated 2-wire transmitters require isolating the sensor power and data signals from the 2-wire loop supply and 2-wire loop return (RTN…

  • over 7 years ago
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• 2-Wire 4-20mA Sensor Transmitters: Sensor and Transmitter Current Consumption Limitations (Part 3)

  

  Collin Wells

  Part 2 of this blog series derived the basic transfer function for a typical 2-wire transmitter, commonly used in industrial control and automation, and explained the currents flowing inside it. It also explained that connecting the transmitter return…

  • over 8 years ago
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• 2-wire 4-20mA transmitters: Controlling 2-Wire Transmitter Outputs with Externally Powered Sources (Part 4)

  

  Collin Wells

  The previous three parts of this blog series focused on 2-wire 4-20mA sensor transmitter designs composed completely of analog components. While analog signal conditioning is practical for linear sensors, many sensors have nonlinear outputs that can only…

  • over 7 years ago
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• 2-Wire 4-20 mA Sensor Transmitters: Understanding the 2-wire Transmitter GND (Part 2)

  

  Collin Wells

  Part 1 of this blog series provided an overview of the operation and uses of 2-wire 4-20 mA field sensor transmitters and provided a basic example system. The post also introduced the current transmitter compliance voltage, which when violated prevents…

  • over 8 years ago
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• How to design fully isolated 4-wire sensor transmitters

  

  Collin Wells

  My previous posts discussed the basics of 4-wire transmitters and showed circuit-level design options for output and power-isolated 4-wire sensor transmitters. In this post, I’ll cover the final isolation configuration for 4-wire sensor transmitters …

  • over 7 years ago
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• Designing output isolated 4-wire sensor transmitters

  

  Collin Wells

  Other Parts Discussed in Post: LM5017 In my last post, I discussed the basic structure of 4-wire sensor transmitters and how they differ from 2-wire and 3-wire sensor transmitters. In this post, I will discuss the construction of a locally powered output…

  • over 7 years ago
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• How to design power-isolated 4-wire sensor transmitters

  

  Collin Wells

  My previous posts discussed the basics of 4-wire sensor transmitters, along with a detailed design of an output-isolated sensor transmitter. Today, I’m discussing power-isolated 4-wire sensor transmitters. First, let’s review the high-level diagram…

  • over 7 years ago
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• Planet Analog: 4-wire current-loop sensor transmitters

  

  Collin Wells

  The publication Planet Analog picked up one of my blog posts for publication to their readers. I invite you to go to their site for the full post . To complement the 2-wire and 3-wire sensor transmitter blogs that Kevin Duke and I have already published…

  • over 7 years ago
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• 2-Wire 4-20 mA Sensor Transmitters: Background and Compliance Voltage (Part 1)

  

  Collin Wells

  Part 1: 2-wire 4-20 mA sensor transmitters are very common in industrial control and automation. They are popular because they allow a remote process to be monitored with only two analog signal wires. The two wires carry both the power for the sensor…

  • over 8 years ago
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