- published: 23 Oct 2014
- views: 68266
In electrical signalling an analog current loop is used where a device must be monitored or controlled remotely over a pair of conductors. Only one current level can be present at any time.
Given its analog nature, current loops are easier to understand and debug than more complicated digital fieldbuses, requiring only a handheld digital multimeter in most situations. Using fieldbuses and solving related problems usually requires much more education and understanding than required by simple current loop systems.
Additional digital communication to the device can be added to current loop using HART Protocol. Digital process buses such as FOUNDATION Fieldbus and Profibus may replace analog current loops.
For industrial process control instruments, analog 4–20 mA and 10–50 mA current loops are commonly used for analog signaling, with 4 mA representing the lowest end of the range and 20 mA the highest. The key advantages of the current loop are that the accuracy of the signal is not affected by voltage drop in the interconnecting wiring, and that the loop can supply operating power to the device. Even if there is significant electrical resistance in the line, the current loop transmitter will maintain the proper current, up to its maximum voltage capability. The live-zero represented by 4 mA allows the receiving instrument to detect some failures of the loop, and also allows transmitter devices to be powered by the same current loop (called two-wire transmitters). Such instruments are used to measure pressure, temperature, level, flow, pH or other process variables. A current loop can also be used to control a valve positioner or other output actuator. An analog current loop can be converted to a voltage input with a precision resistor. Since input terminals of instruments may have one side of the current loop input tied to the chassis ground (earth), analog isolators may be required when connecting several instruments in series.
The Fundamentals of 4-20 mA Current Loops
4-20 mA current loop regulation
Mod-05 Lec-23 4-20 mA current Transmitter design
4 to 20mA Current Loop Tutorial
Simulating a 4-20 mA or 0-10VDC on a PLC input or other analog device
Ground Loops in 4-20 mA Signals
Simulating a 2 wire 4-20 mA current loop with PLC Tools Loop Simulator Standard
TEMPERATURE MEASUREMENT WITH RTD PT100 4-20 mA TRANSMITTER AND ARDUINO
CURRENT SOURCE 4-20 mA
MEDICION DE TEMPERATURA USANDO RTD PT100, TRANSMISOR 4-20 mA y ARDUINO
This webinar is designed as an introductory class for those who have to deal with process signals but are not electrical engineers. Precision Digital's 4-20 mA expert, Joe Ryan brings more than 10 years of process signal experience in the design, marketing, support, and manufacture of process measurement and control devices. He has designed several Precision Digital process meters and served as a Product Marketing Engineer and Product Manager for a line of process controls; supporting sales, service, and support efforts. Joe has extensive experience with 4-20 mA loops and instrumentation devices, as well as the ability to communicate these concepts to those working in the field. After attending this webinar you will have a strong understanding about the fundamentals of the 4-20mA current l...
Circuits for Analog System Design by Prof. M.K. Gunasekaran ,Department of Electronics Design and Technology, IISC Bangalore. For more details on NPTEL visit http://nptel.iitm.ac.in
This is a tutorial video from Intempco on how to use a 4-20mA current loop. It also shows some basic troubleshooting. It uses an intempco float level sensor and a 4 to 20mA transmitter for the demonstration.
The SIM-ALP2 can simulate a 2 wire 4-20 mA loop powered device, a 4 wire 4-20mA current source without an external power supply, or a 0-10VDC signal without an external power supply. http://www.theautomationstore.com/analog-digital-simulator-0-10vdc-and-4-20ma/ Simulating is easy in 1 mA/V or 0.1 mA/V increments by simply clicking the up and down buttons. Each point can be individually calibrated to suit your needs. Comes with carrying case and test leads. Learn more at http://www.theautomationstore.com --- Subscribe to our newsletter! - http://www.theautomationstore.com/newsletter Tim's Twitter - https://twitter.com/TimWilborne Tim's Facebook - https://www.facebook.com/TimWilborne Amber's Facebook - https://www.facebook.com/LadyBugMama Amber's Instagram - https://instagram.com/awilbor...
This webinar offers a basic framework designed to guide you in understanding and preventing ground loops. While a common problem, many instrumentation installers do not fully understand why ground loops happen, or how to avoid them. This is a discussion for instrument installers, operators, and whose who specify 4-20 mA process equipment who are not experienced electrical engineers.
The Current Loop Simulator was developed to assist maintenance personnel and integrators in 4 --to 20 mA analog input testing, troubleshooting and application development. It simulates a 2-wire loop powered transmitter. http://www.theautomationstore.com/analog-digital-simulator-0-10vdc-and-4-20ma/
Measuring temperature with a PT100 RTD, a 4-20 mA current loop http://absolutelyautomation.com http://twitter.com/absolutelyautom transmitter and Arduino nano. A small application written in python with TkInter shows a temperature bar graph in a computer PT100 RTD Transmitter: http://s.click.aliexpress.com/e/NRVzF6iiA Arduino V3 Nano: http://s.click.aliexpress.com/e/VbUz7uvfa Song: "Electro Cabello" By: Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0
Medicion temperatura usando sensor RTD PT100, 4-20 mA y Arduino http://Automatizanos.com http://twitter.com/automatizanos Los valores de temperatura son mostrados en una pequeña aplicacion grafica realizada en Python y TkInter Transmisor PT100 RTD: http://s.click.aliexpress.com/e/ZzJUFEIEe Arduino V3 Nano: http://s.click.aliexpress.com/e/UNBEqRnyB Tema musical: "Electro Cabello" Autor: Kevin MacLeod (incompetech.com) Licencia bajo atribucion Creative Commons:
The Fundamentals of 4 20 mA Current Loops
4-20 mA source and proportional-integral-plus pip comparator
This webinar is designed as an introductory class for those who have to deal with process signals but are not electrical engineers. Precision Digital's 4-20 mA expert, Joe Ryan brings more than 10 years of process signal experience in the design, marketing, support, and manufacture of process measurement and control devices. He has designed several Precision Digital process meters and served as a Product Marketing Engineer and Product Manager for a line of process controls; supporting sales, service, and support efforts. Joe has extensive experience with 4-20 mA loops and instrumentation devices, as well as the ability to communicate these concepts to those working in the field. After attending this webinar you will have a strong understanding about the fundamentals of the 4-20mA current l...
This webinar offers a basic framework designed to guide you in understanding and preventing ground loops. While a common problem, many instrumentation installers do not fully understand why ground loops happen, or how to avoid them. This is a discussion for instrument installers, operators, and whose who specify 4-20 mA process equipment who are not experienced electrical engineers.
We are continuing from last weeks product overview.
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Let go of perception - enter true reality
It€™s 4 :20