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

Dear friends, I have a question: We work on a project which has some boilers to provide steam for desalination unit. The boiler area is safe and the only hazard source is the fuel lines of boilers. I want to know according to NFPA standard which type of instrument should be selected on the fuel line: Eex Type or Non-Eex type? Thanks in advance

2 Answers  

how to replace the smart transmitter software

1 Answers   L&T,

what is the deferance between LCN and UCN.

1 Answers  

what is Potential free contact? where it is used?

3 Answers   Engineers India Limited,

What should be the stanchan Height for installation of Smoke detector & toxic gas detector in field,according to qatar standard

2 Answers  

What is the load line in control valve?

1 Answers   IFFCO,

which processor is used in dcs.

0 Answers   ABB, Wave Distillery,

How is PH sensor works ?

0 Answers  

how the arrangement of equipments done in control room

0 Answers  

hw to calibration a control valve?

3 Answers  

Explain an adaptive / self-tuning controller’s major draw card.

0 Answers  

why 4 to 20 ma used at 0 set

2 Answers   Borouge, Yokogawa,