Answer / anurag,e&a,ispat ind. ltd.

loop is that by which we feedback some output signal to
input.there are two type of loops.
1.closed loop
2.open loop

Answer / ulaganathan

a loop may be defined as connection of elements
to the circuit making use of feedback.
It may be of open or closed type

Answer / ramanathan

A loop is which has a feed back of output&where the error
deduction has been done.eg. in a closed loop there will be
sensing of value & controller will do the job.

Answer / eid elatawy

Loop can be process loop or instrument loop
for instrument loop is the signal from/to Controller(DCS or PLC or....etc) and this signal started from the instrument(valve or transmitter or...)to junction box to DCS through multi core cable.

I WANT TO KNOW SOME BASIC CONCEPTS RELATED TO INSTRUMENTATION

4 Answers  

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Can anyone send most commonley asked Instrumentation questions and answers in cement industry please?

0 Answers  

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The company where I am working, their is rosemount 5400 series radar type level transmitter, it is meant to show level of filled tank, but along with the level it is showing temperature also, so my question is how a onon-contact type radar type level transmitter can show temperature even if it does not have any contact with the fluid?

0 Answers   Process Control Technologies,

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what is IEC code in cables & how to selecting cables?

0 Answers   ROS,

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how to install the Ph and Conductivity analyser? is there are any procedures which has to be maintained.

2 Answers  

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I have one DP transmitter of range 0-500mmWC i have to calculate its range in M3/hr for flow measurement so whats the formula.

4 Answers   ABB, TICB,

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What is the working principle of Dozing valve used in cement industry?

1 Answers  

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Explain PID controller tuning & any one method used for it.

1 Answers   L&T, Oil India,

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what is air to open and air to close control valve and difference btwn this...and how to measure milli amp by this...and what is the role of positioner and i/p converter in this..plz help me

2 Answers   HCL, SOC,

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What is difference between differential pressure & delta pressure?

0 Answers  

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why vortex flow meters and electro magnet flow meters are used in water treatment plants

1 Answers   Elite Construction,

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wht is snap action switch?where it is used?is there any diff between snap action switch and normal pressure switch?

1 Answers   ONGC,

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