Answer / raj anu raj

the valve will go to its fail safe position ie.. either
open or close

Answer / varathan

when communication failure occurs, Valve positioner have
three different action depend on application.
1. Fail to close
2. Fail to open
3. Fail to Standstill.(remain in the previous position)
Note: In automatic closed loop system, during failure
condition; controller must be forced back to manual mode
for safe operation

Answer / vijay singh

if profibus fails in operation.Valve positioner have
different action depend on application.
1.if valve is fail to open then valve will be in fully open
position
2.if valve is fail to close then valve will be in fully
close position.

Answer / ecxlsync

in an event of profibus failure or an absence of command signal, some valves will remain its current position, some will return to its safe position (fail safe).
There are valves designed to fully close (Fail to Close) or Fully Open (Fail to Open) in an event of failure.

Answer / jignesh parekh

during fail of profibus a valve be remain as it is. because
there is no command to travel a control valve move close or
open.

Can u tell me the principle of the tc,rtd,level switch,pressure switch ,transmitter(pr flow level temp.),vibration...plz

0 Answers   Adani, SRF,

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What is the maximum operative of Drive ?

2 Answers   Reddy Labs,

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can someone tell me about electronic speed switch &how it conect with proximittyswitch?(with dgm)

0 Answers  

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what the differant between Wet Leg /Dry Leg

2 Answers   Sepam Group,

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1. How can leveltrol be installed in steam drum for measuring the level of steam drum?

1 Answers   Fischer,

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What is pipe schedule? What are all effects its having in the valve? how do we take care of pipe sch in case if the customer dint specify in the data sheet. What we need assume and in what basis?

3 Answers  

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If we increase only P what will be controller action ?

0 Answers   IMECO,

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In control valve proximity inductive sensor is taken as digital feedback for full open and full close.Normally its volts 24v when the sensor acts the feed back voltage 14v so that our relay not indicating in plc panel . kindly give the solution.

0 Answers  

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I am going to attend a recruitment drive by Schneider in 2 weeks. They have a technical test in the beginning. I would like to know what are the areas i should concentrate on while preparing for the test. My major is Electronics and Instrumentation.

1 Answers  

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What FLOW METER generally used in Gas plant?

5 Answers   Gasco,

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how to set calibration range in a DP transmitter to measure level for a closed tank and for an open tank,and also please explain me how to set calibration range for a DP flow transmitter in a line ?

1 Answers   CCL Products, IOCL,

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Related to control system, What is difference between 4-20 mA active & 4-20 mA pasive signal.

1 Answers  

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