Answer / ramana

I/P is basiclly working on the flapper and nozzle
principle.And the positioner is working on the Forced
balance principle.

Answer / ashok polampalli

I/P Converter , converts 4-20 mA signal from controller
to .2 to 1.0 Kg/cm2 pneumatic signal.

Positioner consist of air supply port , signal input port,
out put port.When positioner get in put signal ,it compare
with stem position and output is generated and signal
boosted sufficiently to operate the valve . It uses force
balance system.

Answer / m m chotrani

It works on force balance principle. A coil is suspended
in a magnetic field on a flexible mount. At the lower end
of the coil is a flapper valve that operates against a
precision ground nozzle to create a backpressure on the
servo diaphragm of a booster relay. The input current flows
in the coil and produces a force between the coil and the
flapper valve, which controls the servo pressure and the
output pressure.Zero adjustment of the unit is made by
turning a screw that regulates the distance between the
flapper valve and the air nozzle. Span adjustmentis made by
varying a potentiometer,which shunts input current past the
coil.

Answer / mayank rathod

mA ---> Kg/Cm2 ---> % Valve Open

4 ---> 0.2 ---> 0%
8 0.4 25%
12 0.6 50%
16 0.8 75%
20 1.0 100%

Answer / rk singh

I/P is input (requirement of process/operator) at which
valve needs to be operated.Positioner gives output
(feedback) to control loop about actual position of valve.
Conclusively-I/P-requirement, Positioner-job done
conformation

Answer / chetan jodatti

it's work to forced balanced
principle

Answer / muhammad jamal

i to p is called current to pneumatic converter.i2p basically takes two inputs one from pressure regulator and one containing 4-20ma and i2p's output goes to positioner in 3-15psi signal form.
positioner provides signal or pneumatic air supply according to the bench set of control valve.each control valve have a bench set

Answer / m.suresh

I/p converter is a heart of
control valve. Positioner is
like a blood circulation.

Answer / devji kanjaria

Their are so many i/p technilogy come in view. like some i/p conveter works on flapper nozzele system but some i/p works on spool valve force balance system.

When we are looking for positioner function then we see soo many venders comes with different type of technology. But the basic principal remain same behind their product. Because all are using same micro-cantroler based smart positioner. They get feedback from position sensor that is connected to the steam of CV and the micro-controller calculate the output air Pr. after checking current Pr.and current command from dcs then generate the command and give to the output signal pressure unit. This process will adjust the steam position.

Answer / rahul d bhoir

i/p means current to penumatic converter its gives 4-20ma
and hi regulate the penumatic pressur

What is the Temperature Co-officient of Resistance of PT- 1000 and PT-2000 ?

2 Answers   Adani, Birla, MEIL,

what is effect of specific gravity in differential level transmitter , explain formula related with this .

0 Answers   Flour Tech Engineers (P) Ltd,

EXPLAIN SOME IMP QUESTIONS AND ANSWERS ON TOPIC ELECTRONICS,INSTRUMENTATION.........

1 Answers   ONGC,

if we open the inlet of an air regulator ,how it will affect the out put of regulator? (out put of regulator is using to operate an on-off valve.it is an air to open valve,and valve is in open position.my doubt is air regulator will hold the valve in open or not,if there is no consumption or leak in regulator out put side ,we only loose the input pressure.)

4 Answers   Asian Paints,

any body who gone thru recent iocl interview.INSTRUMENTATION questions. I need.

0 Answers   IOCL,

What kind of feedback is used in DP cells.

1 Answers   CCIE,

what is the differnt between open loop and close loop ?

5 Answers   India Cements,

In close vessel/ drum why we use d.p. transmitter of -ve range i.e. (-)500 to 0 mmwc.

2 Answers   IMECO, Voltech,

how the 4 to 20 mA signal goes to any controller/indicator,and what is the role of voltage ,12/24 and how to do connection of it, in controller.

1 Answers  

what is seebeck effect?

7 Answers  

what is absolute pressure, gauge pressure and atmospheric pressure?

2 Answers   Mother Dairy,

send me last 5 years questions asked in rrb chennai, for section engineer

0 Answers   RRB,