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.

Difference between 2-Valve Manifolds, 3-Valve Manifolds and 5-Valve Manifolds 3 with diagram

0 Answers   Acire Systems,

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Any one can help me to identified, how can we interchange the device in FF

0 Answers   Ion Exchange,

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why we use only 4 to 20ma other than 0 to 16 ma

5 Answers   Invensys, Systech,

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diff c and c++

1 Answers  

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0 Answers  

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Please send me the sample question of Instrumentation of hpcl/iocl exam. my mail id hihi_kiholo@rediffmail.com

0 Answers  

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1 Answers  

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3 Answers  

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What is the use of +/- 20ma in analog measurement,and which instrument gives +/-20ma output

1 Answers  

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0 Answers   Monnet,

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1 Answers  

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Calibration procedure for Electro magnetic Flow meter

0 Answers   Reliance,

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