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

Is there a particular problem if two proposals from the same observatory (originating with different partners) are submitted?

1 Answers  

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i have used level transmitter in starch cooking preparation tank. tank total height 2mtr.sometime LT display shows some error value when tank is fully empty and diaphragm side i already checked okay no problem in diaphragm area. field cable checked 24volt and mA shows correct value while tank empty mA is 4mA. 4mA i needed that 0% but display showing 10% or 15% percentage values are varying continously please give any good solution for me.....

0 Answers  

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wht is Zero Elevation and Zero Suppression?

12 Answers  

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there is one orifice plate already installed on 3" line, but my previous engineer(who is not working here) removed that tx, but now i want to take it in to the process, so now what i have to do now? flow fluid is hytherm oil of temp. 260deg & pressure is 3bar.

2 Answers  

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Level in tank under vacuum (Ex: Condensate Tank of Power Plant)is measured using D. P. type level transmitter. Tank is subjected to vacuum of 755mmHg. Is it possible to fill wet leg ( i.e. leg connected to top of vessel with low point of D. P. xmtr) with water?. Are there chances of water getting sucked under vacuum? if yes, what is the solution?

3 Answers  

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i have a dp tx range is 5000mmwc. in which calibration i use in a open tank.1.5*3.5*2.5 mtr.for level msmnt. what is the calculation.

2 Answers   Bajaj Hindusthan,

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HOW CREATED LP & HP PRESURES IN DRUM FOR DRUM LEVEL MEASUREMENT!

0 Answers  

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How does pyrometer works?

1 Answers  

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How can you differentiate Instrumentation to Electrical?

1 Answers  

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any body who gone thru recent iocl interview.INSTRUMENTATION questions. I need.

0 Answers   IOCL,

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1.what is the role of proportional comtroller in pid controller?2.How do u calibrate the control valve?

3 Answers   Bently, IOCL,

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Determine the manipulated variable, controlled variable, and the measured variable given a description of various typical industrial processes.

6 Answers   Honeywell,

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