Answer / varun bhardwaj

With out positioner we can operate small size of valves,
but for large sizes of valves , we required Positioner.
Due to force balance principle, the positioner give us a
better accuracy than with out positioner.

Answer / sanjoy panda

Without position-er all the control valve operate but it operating criteria is not satisfy our requirement. Error will be produced very large, and response will be very slow . To avoid on those error we have to use position-er.

Answer / ravi

Without positioner control valve will become on off valve because position feedback dose not transist.

If control valves are able to operate within 3 - 15 psi, that case can possible though I/p converter .

Answer / sunny

No without positioner we canot operate control valve

why direct mounted pressure transmitters is always installed with DBB ( double bleed block) valve in process line or top of the tanks ?

0 Answers  

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Basically iam Instruemntation Engineer, but Iam interested in Instruments design engineering, so plz guide, is there any course, training or Softwres to become Instrument design engineer??.

0 Answers   Honeywell, Tata Steel Limited,

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What is procedure on mmwc in to tph

2 Answers  

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what is the difference between 2 wire and 3 wire RTD- application wise,cost effectivity?

2 Answers  

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Why only negative 24 vdc supply give in vibration measuring system.

6 Answers  

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DEAR SIR/MADAM MY NAME IS ARKAPROVA BHATTACHARYYA.I AM A FRESHER INSTRUMENTATION ENGINEER.CAN YOU PLEASE SEND SOME QUESTION PAPERS OF GRADUATE ENGINEER TRAINEE EXAM OF DVC(DAMODAR VALLY CORPORATION).MY EMAIL IDs ARE arka_aec@rediffmail.com.

0 Answers  

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Please explain for RS 485 & RS 232 communication

1 Answers   Honeywell,

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I was working on calibrating turbidity transmitters endress+hauser at effluent polishing plant.We calibrated using NTU buffers.What happened is that when we immersed the sensor, everytime we raise and lower the sensor gradually, the reading will vary.my question is that is there any specifications on what is the required distance from the bottom of the container with buffer to the face of the sensor?Is it ok to install the sensor in a medium which has turbulence specially if bubbles are present?

0 Answers  

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Technician A says that a fuel tank sending unit will have a high resistance only when the tank is full. Technician B says that its resistance when the tank is full depends on whether the sending unit is designed for use with a bimetallic gauge or with a magnetic gauge. Who is correct?

3 Answers  

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Why went

9 Answers  

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How to calibrate level transmitter with use of HART?

0 Answers   Samsung,

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is any standard angle for thermowell mounting for horizontal and vertical pipe lines?

3 Answers  

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