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

GIVE THE TEMPERATURE RANGE OF PLATIUM RESISTANCE THERMOMETER.

7 Answers   DVC,

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what is the difference between Feedback controller and Feed forward controller. and when it is to be used.

3 Answers  

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you are on site,the plant trips,you are approached by operations,what do you do?

0 Answers   ABB,

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what is bms?

4 Answers   Emco,

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What are de-saturators?

0 Answers  

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Drum level tx with GP4 with zero elevation:7300mmh20 on HP and 8050mmh2o on LP as range but on commissioning the tx readiing is max,Why this reading?

0 Answers  

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what would be the minimum flow rate that we can measure on rotameter..?

0 Answers   TATA,

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I have observed in field instrumentation work... I remove the fuse of an analog transmitter then it shows 7.75 kg/sq cm (which is practically wrong value)in DCS and when put the fuse it shows 0 in dcs. Then cheach the field transmitter termination and found moister. clean that and then it shows 1.1 kg/ sq cm which is right value. Please describe the above phenomenon.

1 Answers  

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Please tell me details about Sox,Nox,SWAS analyser????

0 Answers   Essar,

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whats the abbreviation of IOP? is it instrument of power or input open problem?

0 Answers  

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WHY RESISTANCE TEMPERATURE DETECTOR IS AN ACTIVE DEVICE

2 Answers  

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what is loop?

4 Answers  

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