Signal in hart protocol, Electrical Engineering

Assignment Help:

What is the significance of "4-20 mA" signal in hart protocol?

Ans) the HART protocol is an old Frequency Shift Keying way of distribution data, typically from highway sensors. This is a very old standard by today's standards there are so much better ways to send data. Of course, 4-20 ma loops are even older, dating back over 50 years, and still in common use. Must be something good about it - it is easy.

 

4-20 ma loops are a way to send an analog value, like temperature / position, over a pair of wires. It is easy on the surface, 4 mA is the minimum, and 20 mA is the maximum of the range. The cool thing about this is that it is stable current, not a voltage, so line resistance does not matter. Anything, constant current looks like an open circuit, so it is supposedly immune to noise (by in reality it still has noise pickup problems). Though, why not 0 to 20 mA the cool thing is you can power the remote sensor. You are running a current by the remote you have a voltage at the driving end why not use some of that power to run the electronics in the sensor? Thus, if the sensor pulls less than 4 ma and you make the range 4-20, you always have sufficient current to power the remote at the similar time.

 

 


Related Discussions:- Signal in hart protocol

#title.MIPS assembly language code., Given the INPUT: • An array of 64-bit ...

Given the INPUT: • An array of 64-bit unsigned integer elements stored in the memory starting at a known location SOURCE. • The size of the array (i.e., number of elements) stored

Explain polymers and their applications, Explain Polymers and their applica...

Explain Polymers and their applications. Polymeric materials or plastics contain a large group of organo or organic metallic high molecules compound. The common properties of s

Illustrate the simplex transmission, Q. Illustrate the Simplex Transmission...

Q. Illustrate the Simplex Transmission? Simplex Transmission Data in a simplex channel is always one way. Simplex channels aren't often used as it is not possible to send ba

3 phase 4 wire meters, 3 Phase 4 Wire Meters 3-phase 4 wire meters (10...

3 Phase 4 Wire Meters 3-phase 4 wire meters (10/20, 20/50 A) are used for agricultural and industrial consumers. For loads up to 50 A, the meters are directly linked to the su

Show that conservation of power is satisfied by the circuit, Given the netw...

Given the network in Figure, (a) Find the currents through resistors R 1 , R 2 , and R 3 . (b) Compute the voltage V 1 . (c) Show that the conservation of power is satisfi

What is microprocessor, What is Microprocessor? Give the power supply & clo...

What is Microprocessor? Give the power supply & clock frequency of 8085. A microprocessor is a multipurpose, programmable logic device that reads binary instructions from a sto

Describe watch dog timer and reaction timer, a. Given a timer with a termin...

a. Given a timer with a terminal count and a clock frequency of 10 MHz measure the following: (i) Range & Resolution (ii) Terminal count values needed to measure 3ms interval

Determine the dimensions of the new model, The manufacturers of the tank de...

The manufacturers of the tank described in Problem would like to  design another model, with twice the capacity of the one described in figure. The ratio of height to diameter must

What do you mean by superposition and linearity, Q. What do you mean by Sup...

Q. What do you mean by Superposition and linearity? Mathematically a function is said to be linear if it satisfies two properties: homogeneity (proportionality or scaling) and

Illustrate the internal architecture of 8085, Microprocessor 1. Write a...

Microprocessor 1. Write an assembly language program to find the highest among two numbers. 2. Draw and illustrate the internal architecture of 8085 briefly. 3. What is t

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd