Answer / farooq

if three sensors installed to measure or monitor one process
variable and when two of them give a high or equal to a set
value than an alarm or correcting action can be activated is
called 2 out of 3 automtion.

Answer / senthil

for example,consider the three transmitters are in
service.in logic,the three xtr compare each other value i.e
A&B,B&C,C&A. check the diff of deviation b/w the
comparison.the xtrs showing minimum deviation is taken,from
this the mean is taken b/w two xtrs.this is 2 0f 3.

Answer / ladla

this information is apply for alarm and trip system where
these shows the redundant of the system

Answer / senthil

2 out of 3:
for example:
we use three pressure transmitters in the process line
discharge of a pump.consider the range is ( 0 to 10 bar).we
have a condition that when the discharge pressure is low the
pump has to trip(less than 4bar).
-if two transmitters goes below this value there is trip.
we have deviation alarm,deviation deadband warning also in 2
voting 3 concept.

Answer / gopi

step by step implimentation our logics by using any controller

I am working in a process industry, in that there are several sections devided in the SCADA screens and individual sections may START independently. But sometimes i am facing problem i.e, if section 2 Stopped by the operator immediately Section 1 or Section 3 or Section 4 is getting stopped can you expain the reason behind this?

5 Answers  

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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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In a gas over oil actuator, after the opening/closing of valve, how the gas is vented out? How does the hydraulic/gas circuit function?

0 Answers   Reliance,

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anybody having Qatar Petroleum questions for instrument Technician offshore ....please send me

0 Answers  

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what is the criteria to decide conductor size of a cable ?

0 Answers  

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generally for transmitter we are giving supply 24vlts?but we are getting output 4-20ma ? how it is possible? is there any operation inside the tx?pls give complete information?

3 Answers  

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What are the two program execution modes of PLC?

4 Answers  

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Can any one send me IOCL instrumentation question papers.. i dont know the pattern of the questions and what to prepare can any one help me on this .. my email id is anwarnishil@gmail.com

0 Answers  

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how to check the leak in thermowells

1 Answers  

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How many types of Control Modes in process control, plz tell me all.....?

2 Answers  

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why we use double acting valve and where?

1 Answers   Aker Solutions,

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i want interview questions about PROCESS CONTROL INSTRUMENTATION , SENSORS AND TRANSDUCERS IF ANY BADY KNOW ABOUT THAT PLEASE SEND TO MY MAIL karumudi1003@gmail.com

8 Answers   Honeywell, Reliance,

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