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

how to do loop checking pls email to shanavaska2000@yahoo.com

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